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A Linear Collider Vision for the Future of Particle Physics
Authors:
H. Abramowicz,
E. Adli,
F. Alharthi,
M. Almanza-Soto,
M. M. Altakach,
W. Altmannshofer,
S. Ampudia Castelazo,
D. Angal-Kalinin,
J. A. Anguiano,
R. B. Appleby,
O. Apsimon,
A. Arbey,
F. Arco,
O. Arquero,
A. Aryshev,
S. Asai,
D. Attie,
J. L. Avila-Jimenez,
H. Baer,
J. A. Bagger,
Y. Bai,
I. R. Bailey,
C. Balazs,
P. Bambade,
T. Barklow
, et al. (426 additional authors not shown)
Abstract:
In this paper we review the physics opportunities at linear $e^+e^-$ colliders with a special focus on high centre-of-mass energies and beam polarisation, take a fresh look at the various accelerator technologies available or under development and, for the first time, discuss how a facility first equipped with a technology mature today could be upgraded with technologies of tomorrow to reach much…
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In this paper we review the physics opportunities at linear $e^+e^-$ colliders with a special focus on high centre-of-mass energies and beam polarisation, take a fresh look at the various accelerator technologies available or under development and, for the first time, discuss how a facility first equipped with a technology mature today could be upgraded with technologies of tomorrow to reach much higher energies and/or luminosities. In addition, we will discuss detectors and alternative collider modes, as well as opportunities for beyond-collider experiments and R\&D facilities as part of a linear collider facility (LCF). The material of this paper will support all plans for $e^+e^-$ linear colliders and additional opportunities they offer, independently of technology choice or proposed site, as well as R\&D for advanced accelerator technologies. This joint perspective on the physics goals, early technologies and upgrade strategies has been developed by the LCVision team based on an initial discussion at LCWS2024 in Tokyo and a follow-up at the LCVision Community Event at CERN in January 2025. It heavily builds on decades of achievements of the global linear collider community, in particular in the context of CLIC and ILC.
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Submitted 23 December, 2025; v1 submitted 25 March, 2025;
originally announced March 2025.
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Detailed Report on the Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
Authors:
D. P. Aguillard,
T. Albahri,
D. Allspach,
A. Anisenkov,
K. Badgley,
S. Baeßler,
I. Bailey,
L. Bailey,
V. A. Baranov,
E. Barlas-Yucel,
T. Barrett,
E. Barzi,
F. Bedeschi,
M. Berz,
M. Bhattacharya,
H. P. Binney,
P. Bloom,
J. Bono,
E. Bottalico,
T. Bowcock,
S. Braun,
M. Bressler,
G. Cantatore,
R. M. Carey,
B. C. K. Casey
, et al. (168 additional authors not shown)
Abstract:
We present details on a new measurement of the muon magnetic anomaly, $a_μ= (g_μ-2)/2$. The result is based on positive muon data taken at Fermilab's Muon Campus during the 2019 and 2020 accelerator runs. The measurement uses $3.1$ GeV$/c$ polarized muons stored in a $7.1$-m-radius storage ring with a $1.45$ T uniform magnetic field. The value of $ a_μ$ is determined from the measured difference b…
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We present details on a new measurement of the muon magnetic anomaly, $a_μ= (g_μ-2)/2$. The result is based on positive muon data taken at Fermilab's Muon Campus during the 2019 and 2020 accelerator runs. The measurement uses $3.1$ GeV$/c$ polarized muons stored in a $7.1$-m-radius storage ring with a $1.45$ T uniform magnetic field. The value of $ a_μ$ is determined from the measured difference between the muon spin precession frequency and its cyclotron frequency. This difference is normalized to the strength of the magnetic field, measured using Nuclear Magnetic Resonance (NMR). The ratio is then corrected for small contributions from beam motion, beam dispersion, and transient magnetic fields. We measure $a_μ= 116 592 057 (25) \times 10^{-11}$ (0.21 ppm). This is the world's most precise measurement of this quantity and represents a factor of $2.2$ improvement over our previous result based on the 2018 dataset. In combination, the two datasets yield $a_μ(\text{FNAL}) = 116 592 055 (24) \times 10^{-11}$ (0.20 ppm). Combining this with the measurements from Brookhaven National Laboratory for both positive and negative muons, the new world average is $a_μ$(exp) $ = 116 592 059 (22) \times 10^{-11}$ (0.19 ppm).
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Submitted 22 May, 2024; v1 submitted 23 February, 2024;
originally announced February 2024.
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Search for effective Lorentz and CPT violation using ZEUS data
Authors:
ZEUS collaboration,
I. Abt,
R. Aggarwal,
V. Aushev,
O. Behnke,
A. Bertolin,
I. Bloch,
I. Brock,
N. H. Brook,
R. Brugnera,
A. Bruni,
P. J. Bussey,
A. Caldwell,
C. D. Catterall,
J. Chwastowski,
J. Ciborowski,
R. Ciesielski,
A. M. Cooper-Sarkar,
M. Corradi,
R. K. Dementiev,
S. Dusini,
J. Ferrando,
B. Foster,
E. Gallo,
D. Gangadharan
, et al. (55 additional authors not shown)
Abstract:
Lorentz and CPT symmetry in the quark sector of the Standard Model are studied in the context of an effective field theory using ZEUS $e^{\pm} p$ data. Symmetry-violating effects can lead to time-dependent oscillations of otherwise time-independent observables, including scattering cross sections. An analysis using five years of inclusive neutral-current deep inelastic scattering events correspond…
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Lorentz and CPT symmetry in the quark sector of the Standard Model are studied in the context of an effective field theory using ZEUS $e^{\pm} p$ data. Symmetry-violating effects can lead to time-dependent oscillations of otherwise time-independent observables, including scattering cross sections. An analysis using five years of inclusive neutral-current deep inelastic scattering events corresponding to an integrated HERA luminosity of $372\; \text{pb}^{-1}$ at $\sqrt{s} = 318$ Gev has been performed. No evidence for oscillations in sidereal time has been observed within statistical and systematic uncertainties. Constraints, most for the first time, are placed on 42 coefficients parameterising dominant CPT-even dimension-four and CPT-odd dimension-five spin-independent modifications to the propagation and interaction of light quarks.
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Submitted 24 December, 2022;
originally announced December 2022.
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Measurement of the cross-section ratio $σ_{ψ(2S )}/σ_{J/ψ(1S )}$ in exclusive photoproduction at HERA
Authors:
ZEUS Collaboration,
I. Abt,
M. Adamus,
R. Aggarwal,
V. Aushev,
O. Behnke,
A. Bertolin,
I. Bloch,
I. Brock,
N. H. Brook,
R. Brugnera,
A. Bruni,
P. J. Bussey,
A. Caldwell,
C. D. Catterall,
J. Chwastowski,
J. Ciborowski,
R. Ciesielski,
A. M. Cooper-Sarkar,
M. Corradi,
R. K. Dementiev,
S. Dusini,
J. Ferrando,
B. Foster,
E. Gallo
, et al. (58 additional authors not shown)
Abstract:
The exclusive photoproduction reactions $γp \to J/ψ(1S) p$ and $γp \to ψ(2S) p$ have been measured at an $ep$ centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 373 pb$^{-1}$. The measurement was made in the kinematic range $30 < W < 180$ GeV, $Q^2 < 1$ GeV$^2$ and $|t| < 1$ GeV$^2$, where $W$ is the photon--proton centre-of-mass energy, $Q^2$ is the…
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The exclusive photoproduction reactions $γp \to J/ψ(1S) p$ and $γp \to ψ(2S) p$ have been measured at an $ep$ centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 373 pb$^{-1}$. The measurement was made in the kinematic range $30 < W < 180$ GeV, $Q^2 < 1$ GeV$^2$ and $|t| < 1$ GeV$^2$, where $W$ is the photon--proton centre-of-mass energy, $Q^2$ is the photon virtuality and $t$ is the squared four-momentum transfer at the proton vertex. The decay channels used were $J/ψ(1S) \to μ^+ μ^-$, $ψ(2S) \to μ^+ μ^-$ and $ψ(2S) \to J/ψ(1S) π^+ π^-$ with subsequent decay $J/ψ(1S) \to μ^+ μ^-$. The ratio of the production cross sections, $R = σ_{ψ(2S)} / σ_{J/ψ(1S)}$, has been measured as a function of $W$ and $|t|$ and compared to previous data in photoproduction and deep inelastic scattering and with predictions of QCD-inspired models of exclusive vector-meson production, which are in reasonable agreement with the data.
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Submitted 27 December, 2022; v1 submitted 27 June, 2022;
originally announced June 2022.
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The International Linear Collider: Report to Snowmass 2021
Authors:
Alexander Aryshev,
Ties Behnke,
Mikael Berggren,
James Brau,
Nathaniel Craig,
Ayres Freitas,
Frank Gaede,
Spencer Gessner,
Stefania Gori,
Christophe Grojean,
Sven Heinemeyer,
Daniel Jeans,
Katja Kruger,
Benno List,
Jenny List,
Zhen Liu,
Shinichiro Michizono,
David W. Miller,
Ian Moult,
Hitoshi Murayama,
Tatsuya Nakada,
Emilio Nanni,
Mihoko Nojiri,
Hasan Padamsee,
Maxim Perelstein
, et al. (487 additional authors not shown)
Abstract:
The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This docu…
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The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community.
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Submitted 16 January, 2023; v1 submitted 14 March, 2022;
originally announced March 2022.
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Impact of jet-production data on the next-to-next-to-leading-order determination of HERAPDF2.0 parton distributions
Authors:
H1,
ZEUS Collaborations,
:,
I. Abt,
R. Aggarwal,
V. Andreev,
M. Arratia,
V. Aushev,
A. Baghdasaryan,
A. Baty,
K. Begzsuren,
O. Behnke,
A. Belousov,
A. Bertolin,
I. Bloch,
V. Boudry,
G. Brandt,
I. Brock,
N. H. Brook,
R. Brugnera,
A. Bruni,
A. Buniatyan,
P. J. Bussey,
L. Bystritskaya,
A. Caldwell
, et al. (212 additional authors not shown)
Abstract:
The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of the HERA data on inclusive deep inelastic $ep$ scattering together with jet data as published by the H1 and ZEUS collaborations. A perturbative QCD fit, simultaneously of $α_s(M_Z^2)$ and and the PDFs, was performed with the result…
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The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of the HERA data on inclusive deep inelastic $ep$ scattering together with jet data as published by the H1 and ZEUS collaborations. A perturbative QCD fit, simultaneously of $α_s(M_Z^2)$ and and the PDFs, was performed with the result $α_s(M_Z^2) = 0.1156 \pm 0.0011~{\rm (exp)}~ ^{+0.0001}_{-0.0002}~ {\rm (model}$ ${\rm +~parameterisation)}~ \pm 0.0029~{\rm (scale)}$. The PDF sets of HERAPDF2.0Jets NNLO were determined with separate fits using two fixed values of $α_s(M_Z^2)$, $α_s(M_Z^2)=0.1155$ and $0.118$, since the latter value was already chosen for the published HERAPDF2.0 NNLO analysis based on HERA inclusive DIS data only. The different sets of PDFs are presented, evaluated and compared. The consistency of the PDFs determined with and without the jet data demonstrates the consistency of HERA inclusive and jet-production cross-section data. The inclusion of the jet data reduced the uncertainty on the gluon PDF. Predictions based on the PDFs of HERAPDF2.0Jets NNLO give an excellent description of the jet-production data used as input.
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Submitted 2 December, 2021;
originally announced December 2021.
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The International Linear Collider: A Global Project
Authors:
Philip Bambade,
Tim Barklow,
Ties Behnke,
Mikael Berggren,
James Brau,
Philip Burrows,
Dmitri Denisov,
Angeles Faus-Golfe,
Brian Foster,
Keisuke Fujii,
Juan Fuster,
Frank Gaede,
Paul Grannis,
Christophe Grojean,
Andrew Hutton,
Benno List,
Jenny List,
Shinichiro Michizono,
Akiya Miyamoto,
Olivier Napoly,
Michael Peskin,
Roman Poeschl,
Frank Simon,
Jan Strube,
Junping Tian
, et al. (7 additional authors not shown)
Abstract:
The International Linear Collider (ILC) is now under consideration as the next global project in particle physics. In this report, we review of all aspects of the ILC program: the physics motivation, the accelerator design, the run plan, the proposed detectors, the experimental measurements on the Higgs boson, the top quark, the couplings of the W and Z bosons, and searches for new particles. We r…
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The International Linear Collider (ILC) is now under consideration as the next global project in particle physics. In this report, we review of all aspects of the ILC program: the physics motivation, the accelerator design, the run plan, the proposed detectors, the experimental measurements on the Higgs boson, the top quark, the couplings of the W and Z bosons, and searches for new particles. We review the important role that polarized beams play in the ILC program. The first stage of the ILC is planned to be a Higgs factory at 250 GeV in the centre of mass. Energy upgrades can naturally be implemented based on the concept of a linear collider. We discuss in detail the ILC program of Higgs boson measurements and the expected precision in the determination of Higgs couplings. We compare the ILC capabilities to those of the HL-LHC and to those of other proposed e+e- Higgs factories. We emphasize throughout that the readiness of the accelerator and the estimates of ILC performance are based on detailed simulations backed by extensive RandD and, for the accelerator technology, operational experience.
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Submitted 5 April, 2019; v1 submitted 4 March, 2019;
originally announced March 2019.
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Running of the Charm-Quark Mass from HERA Deep-Inelastic Scattering Data
Authors:
A. Gizhko,
A. Geiser,
S. Moch,
I. Abt,
O. Behnke,
A. Bertolin,
J. Blümlein,
D. Britzger,
R. Brugnera,
A. Buniatyan,
P. J. Bussey,
R. Carlin,
A. M. Cooper-Sarkar,
K. Daum,
S. Dusini,
E. Elsen,
L. Favart,
J. Feltesse,
B. Foster,
A. Garfagnini,
M. Garzelli,
J. Gayler,
D. Haidt,
J. Hladky,
A. W. Jung
, et al. (25 additional authors not shown)
Abstract:
Combined HERA data on charm production in deep-inelastic scattering have previously been used to determine the charm-quark running mass $m_c(m_c)$ in the MSbar renormalisation scheme. Here, the same data are used as a function of the photon virtuality $Q^2$ to evaluate the charm-quark running mass at different scales to one-loop order, in the context of a next-to-leading order QCD analysis. The sc…
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Combined HERA data on charm production in deep-inelastic scattering have previously been used to determine the charm-quark running mass $m_c(m_c)$ in the MSbar renormalisation scheme. Here, the same data are used as a function of the photon virtuality $Q^2$ to evaluate the charm-quark running mass at different scales to one-loop order, in the context of a next-to-leading order QCD analysis. The scale dependence of the mass is found to be consistent with QCD expectations.
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Submitted 24 May, 2017;
originally announced May 2017.
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Investigation into the limits of perturbation theory at low Q^2 using HERA deep inelastic scattering data
Authors:
I. Abt,
A. M. Cooper-Sarkar,
B. Foster,
V. Myronenko,
K. Wichmann,
M. Wing
Abstract:
A phenomenological study of the final combined HERA data on inclusive deep inelastic scattering (DIS) has been performed. The data are presented and investigated for a kinematic range extending from values of the four-momentum transfer, $Q^2$, above 10$^4$ GeV$^2$ down to the lowest values observable at HERA of $Q^2$ = 0.045 GeV$^2$ and Bjorken $x$, $x_{\rm Bj}$ = 6 $\cdot$ 10$^{-7}$. The data are…
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A phenomenological study of the final combined HERA data on inclusive deep inelastic scattering (DIS) has been performed. The data are presented and investigated for a kinematic range extending from values of the four-momentum transfer, $Q^2$, above 10$^4$ GeV$^2$ down to the lowest values observable at HERA of $Q^2$ = 0.045 GeV$^2$ and Bjorken $x$, $x_{\rm Bj}$ = 6 $\cdot$ 10$^{-7}$. The data are well described by fits based on perturbative quantum chromodynamics (QCD) using collinear factorisation and evolution of the parton densities encompassed in the DGLAP formalism from the highest $Q^2$ down to $Q^2$ of a few GeV$^2$. The Regge formalism can describe the data up to $Q^2 \approx$ 0.65 GeV$^2$. The complete data set can be described by a new fit using the ALLM parameterisation. The region between the Regge and the perturbative QCD regimes is of particular interest.
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Submitted 18 July, 2017; v1 submitted 11 April, 2017;
originally announced April 2017.
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Study of HERA data at Low Q^2 and Low x
Authors:
A. M Cooper-Sarkar,
I. Abt,
B. Foster,
M. Wing,
V. Myronenko,
K. Wichmann
Abstract:
In the HERAPDF2.0 PDF analysis it was noted that the fit $χ^2$ worsens significantly at low $Q^2$ for both NLO and NNLO fits. The turn over of the reduced cross section at low-$x$ and low $Q^2$ due to the contribution of the longitudinal cross section $F_L$ is also not very well described. In this paper the prediction for $F_L$ is highlighted and the corresponding extraction of $F_2$ from the data…
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In the HERAPDF2.0 PDF analysis it was noted that the fit $χ^2$ worsens significantly at low $Q^2$ for both NLO and NNLO fits. The turn over of the reduced cross section at low-$x$ and low $Q^2$ due to the contribution of the longitudinal cross section $F_L$ is also not very well described. In this paper the prediction for $F_L$ is highlighted and the corresponding extraction of $F_2$ from the data is further investigated, showing discrepancies with description of HERAPDF2.0 at low $x$ and $Q^2$. The effect of adding a simple higher twist term of the form ~$F_L*A/Q^2$ to the description of $F_L$ is investigated. This results in a significantly better description of the reduced cross-sections, $F_2$ and $F_L$ at low $x$, $Q^2$ and a significantly lower $χ^2$ for the NNLO fit as compared to the NLO fit. This is not the case if the higher twist term is added to $F_2$
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Submitted 27 May, 2016;
originally announced May 2016.
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Combined Electroweak and QCD Fit to HERA Data
Authors:
I. Abt,
A. M. Cooper-Sarkar,
B. Foster,
C. Gwenlan,
V. Myronenko,
O. Turkot,
K. Wichmann
Abstract:
A simultaneous Electroweak and QCD fit of electroweak parameters and parton distribution functions to HERA data on deep inelastic scattering is presented. The input data are neutral current and charged current inclusive cross sections measured by the H1 and ZEUS collaborations at the ep collider HERA. The polarisation of the electron beam was taken into account for the ZEUS and H1 data recorded be…
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A simultaneous Electroweak and QCD fit of electroweak parameters and parton distribution functions to HERA data on deep inelastic scattering is presented. The input data are neutral current and charged current inclusive cross sections measured by the H1 and ZEUS collaborations at the ep collider HERA. The polarisation of the electron beam was taken into account for the ZEUS and H1 data recorded between 2004 and 2007. Results are presented on the vector and axial-vector couplings of the Z boson to u- and d-type quarks. The values are in agreement with Standard Model predictions. The results on a_u and v_u represent the most precise measurements from a single process.
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Submitted 18 April, 2016;
originally announced April 2016.
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Study of HERA ep Data at Low Q^2 and Low x_Bj and the Need for Higher-Twist Corrections to Standard pQCD Fits
Authors:
I. Abt,
A. M. Cooper-Sarkar,
B. Foster,
V. Myronenko,
K. Wichmann,
M. Wing
Abstract:
A detailed comparison of HERA data at low Bjorken-$x$ and low four-momentum-transfer squared, $Q^2$, with predictions based on $\ln{Q^2}$ evolution (DGLAP) in perturbative Quantum Chromo Dynamics suggests inadequacies of this framework. The standard DGLAP evolution was augmented by including an additional higher-twist term in the description of the longitudinal structure function, $F_{\rm L}$. Thi…
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A detailed comparison of HERA data at low Bjorken-$x$ and low four-momentum-transfer squared, $Q^2$, with predictions based on $\ln{Q^2}$ evolution (DGLAP) in perturbative Quantum Chromo Dynamics suggests inadequacies of this framework. The standard DGLAP evolution was augmented by including an additional higher-twist term in the description of the longitudinal structure function, $F_{\rm L}$. This additional term, $F_{\rm L}~A_{\rm L}^{\rm HT}/Q^2$, improves the description of the reduced cross sections significantly. The resulting predictions for $F_{\rm L}$ suggest that further corrections are required for $Q^2$ less than about 2 GeV$^2$.
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Submitted 11 October, 2016; v1 submitted 8 April, 2016;
originally announced April 2016.
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Search for a narrow baryonic state decaying to ${pK^0_S}$ and ${\bar{p}K^0_S}$ in deep inelastic scattering at HERA
Authors:
ZEUS Collaboration,
H. Abramowicz,
I. Abt,
L. Adamczyk,
M. Adamus,
S. Antonelli,
V. Aushev,
O. Behnke,
U. Behrens,
A. Bertolin,
S. Bhadra,
I. Bloch,
E. G. Boos,
I. Brock,
N. H. Brook,
R. Brugnera,
A. Bruni,
P. J. Bussey,
A. Caldwell,
M. Capua,
C. D. Catterall,
J. Chwastowski,
J. Ciborowski,
R. Ciesielski,
A. M. Cooper-Sarkar
, et al. (102 additional authors not shown)
Abstract:
A search for a narrow baryonic state in the $pK^0_S$ and $\bar{p}K^0_S$ system has been performed in $ep$ collisions at HERA with the ZEUS detector using an integrated luminosity of 358 pb$^{-1}$ taken in 2003-2007. The search was performed with deep inelastic scattering events at an $ep$ centre-of-mass energy of 318 GeV for exchanged photon virtuality, $Q^2$, between 20 and 100 $\rm{} GeV^{2}$. C…
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A search for a narrow baryonic state in the $pK^0_S$ and $\bar{p}K^0_S$ system has been performed in $ep$ collisions at HERA with the ZEUS detector using an integrated luminosity of 358 pb$^{-1}$ taken in 2003-2007. The search was performed with deep inelastic scattering events at an $ep$ centre-of-mass energy of 318 GeV for exchanged photon virtuality, $Q^2$, between 20 and 100 $\rm{} GeV^{2}$. Contrary to evidence presented for such a state around 1.52 GeV in a previous ZEUS analysis using a sample of 121 pb$^{-1}$ taken in 1996-2000, no resonance peak was found in the $p(\bar{p})K^0_S$ invariant-mass distribution in the range 1.45-1.7 GeV. Upper limits on the production cross section are set.
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Submitted 3 June, 2016; v1 submitted 7 April, 2016;
originally announced April 2016.
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Limits on the effective quark radius from inclusive $ep$ scattering at HERA
Authors:
ZEUS Collaboration,
H. Abramowicz,
I. Abt,
L. Adamczyk,
M. Adamus,
S. Antonelli,
V. Aushev,
O. Behnke,
U. Behrens,
A. Bertolin,
S. Bhadra,
I. Bloch,
E. G. Boos,
I. Brock,
N. H. Brook,
R. Brugnera,
A. Bruni,
P. J. Bussey,
A. Caldwell,
M. Capua,
C. D. Catterall,
J. Chwastowski,
J. Ciborowski,
R. Ciesielski,
A. M. Cooper-Sarkar
, et al. (103 additional authors not shown)
Abstract:
The high-precision HERA data allows searches up to TeV scales for Beyond the Standard Model contributions to electron-quark scattering. Combined measurements of the inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering corresponding to a luminosity of around 1 fb$^{-1}$ have been used in this analysis. A new approach to the beyond the Standard Model analysis of the…
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The high-precision HERA data allows searches up to TeV scales for Beyond the Standard Model contributions to electron-quark scattering. Combined measurements of the inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering corresponding to a luminosity of around 1 fb$^{-1}$ have been used in this analysis. A new approach to the beyond the Standard Model analysis of the inclusive $ep$ data is presented; simultaneous fits of parton distribution functions together with contributions of "new physics" processes were performed. Results are presented considering a finite radius of quarks within the quark form-factor model. The resulting 95% C.L. upper limit on the effective quark radius is $0.43\cdot 10^{-16}$ cm.
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Submitted 5 April, 2016;
originally announced April 2016.
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Combined QCD and electroweak analysis of HERA data
Authors:
ZEUS Collaboration,
H. Abramowicz,
I. Abt,
L. Adamczyk,
M. Adamus,
S. Antonelli,
V. Aushev,
O. Behnke,
U. Behrens,
A. Bertolin,
S. Bhadra,
I. Bloch,
E. G. Boos,
I. Brock,
N. H. Brook,
R. Brugnera,
A. Bruni,
P. J. Bussey,
A. Caldwell,
M. Capua,
C. D. Catterall,
J. Chwastowski,
J. Ciborowski,
R. Ciesielski,
A. M. Cooper-Sarkar
, et al. (102 additional authors not shown)
Abstract:
A simultaneous fit of parton distribution functions (PDFs) and electroweak parameters to HERA data on deep inelastic scattering is presented. The input data are the neutral current and charged current inclusive cross sections which were previously used in the QCD analysis leading to the HERAPDF2.0 PDFs. In addition, the polarisation of the electron beam was taken into account for the ZEUS data rec…
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A simultaneous fit of parton distribution functions (PDFs) and electroweak parameters to HERA data on deep inelastic scattering is presented. The input data are the neutral current and charged current inclusive cross sections which were previously used in the QCD analysis leading to the HERAPDF2.0 PDFs. In addition, the polarisation of the electron beam was taken into account for the ZEUS data recorded between 2004 and 2007. Results on the vector and axial-vector couplings of the Z boson to u- and d-type quarks, on the value of the electroweak mixing angle and the mass of the W boson are presented. The values obtained for the electroweak parameters are in agreement with Standard Model predictions.
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Submitted 13 May, 2016; v1 submitted 31 March, 2016;
originally announced March 2016.
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The Physics of the B Factories
Authors:
A. J. Bevan,
B. Golob,
Th. Mannel,
S. Prell,
B. D. Yabsley,
K. Abe,
H. Aihara,
F. Anulli,
N. Arnaud,
T. Aushev,
M. Beneke,
J. Beringer,
F. Bianchi,
I. I. Bigi,
M. Bona,
N. Brambilla,
J. B rodzicka,
P. Chang,
M. J. Charles,
C. H. Cheng,
H. -Y. Cheng,
R. Chistov,
P. Colangelo,
J. P. Coleman,
A. Drutskoy
, et al. (2009 additional authors not shown)
Abstract:
This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C.
Please note that version 3 on the archive is the auxiliary…
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This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C.
Please note that version 3 on the archive is the auxiliary version of the Physics of the B Factories book. This uses the notation alpha, beta, gamma for the angles of the Unitarity Triangle. The nominal version uses the notation phi_1, phi_2 and phi_3. Please cite this work as Eur. Phys. J. C74 (2014) 3026.
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Submitted 31 October, 2015; v1 submitted 24 June, 2014;
originally announced June 2014.
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The International Linear Collider Technical Design Report - Volume 1: Executive Summary
Authors:
Ties Behnke,
James E. Brau,
Brian Foster,
Juan Fuster,
Mike Harrison,
James McEwan Paterson,
Michael Peskin,
Marcel Stanitzki,
Nicholas Walker,
Hitoshi Yamamoto
Abstract:
The International Linear Collider Technical Design Report (TDR) describes in four volumes the physics case and the design of a 500 GeV centre-of-mass energy linear electron-positron collider based on superconducting radio-frequency technology using Niobium cavities as the accelerating structures. The accelerator can be extended to 1 TeV and also run as a Higgs factory at around 250 GeV and on the…
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The International Linear Collider Technical Design Report (TDR) describes in four volumes the physics case and the design of a 500 GeV centre-of-mass energy linear electron-positron collider based on superconducting radio-frequency technology using Niobium cavities as the accelerating structures. The accelerator can be extended to 1 TeV and also run as a Higgs factory at around 250 GeV and on the Z0 pole. A comprehensive value estimate of the accelerator is give, together with associated uncertainties. It is shown that no significant technical issues remain to be solved. Once a site is selected and the necessary site-dependent engineering is carried out, construction can begin immediately. The TDR also gives baseline documentation for two high-performance detectors that can share the ILC luminosity by being moved into and out of the beam line in a "push-pull" configuration. These detectors, ILD and SiD, are described in detail. They form the basis for a world-class experimental programme that promises to increase significantly our understanding of the fundamental processes that govern the evolution of the Universe.
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Submitted 26 June, 2013;
originally announced June 2013.
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From the LHC to Future Colliders
Authors:
A. De Roeck,
J. Ellis,
C. Grojean,
S. Heinemeyer,
K. Jakobs,
G. Weiglein,
J. Wells,
G. Azuelos,
S. Dawson,
B. Gripaios,
T. Han,
J. Hewett,
M. Lancaster,
C. Mariotti,
F. Moortgat,
G. Moortgat-Pick,
G. Polesello,
S. Riemann,
M. Schumacher,
K. Assamagan,
P. Bechtle,
M. Carena,
G. Chachamis,
K. F. Chen,
S. De Curtis
, et al. (39 additional authors not shown)
Abstract:
Discoveries at the LHC will soon set the physics agenda for future colliders. This report of a CERN Theory Institute includes the summaries of Working Groups that reviewed the physics goals and prospects of LHC running with 10 to 300/fb of integrated luminosity, of the proposed sLHC luminosity upgrade, of the ILC, of CLIC, of the LHeC and of a muon collider. The four Working Groups considered po…
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Discoveries at the LHC will soon set the physics agenda for future colliders. This report of a CERN Theory Institute includes the summaries of Working Groups that reviewed the physics goals and prospects of LHC running with 10 to 300/fb of integrated luminosity, of the proposed sLHC luminosity upgrade, of the ILC, of CLIC, of the LHeC and of a muon collider. The four Working Groups considered possible scenarios for the first 10/fb of data at the LHC in which (i) a state with properties that are compatible with a Higgs boson is discovered, (ii) no such state is discovered either because the Higgs properties are such that it is difficult to detect or because no Higgs boson exists, (iii) a missing-energy signal beyond the Standard Model is discovered as in some supersymmetric models, and (iv) some other exotic signature of new physics is discovered. In the contexts of these scenarios, the Working Groups reviewed the capabilities of the future colliders to study in more detail whatever new physics may be discovered by the LHC. Their reports provide the particle physics community with some tools for reviewing the scientific priorities for future colliders after the LHC produces its first harvest of new physics from multi-TeV collisions.
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Submitted 17 September, 2009;
originally announced September 2009.
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Radiation Damping in Einstein-Aether Theory
Authors:
Brendan Z. Foster
Abstract:
This work concerns the loss of energy of a material system due to gravitational radiation in Einstein-aether theory-an alternative theory of gravity in which the metric couples to a dynamical, timelike, unit-norm vector field. Derived to lowest post-Newtonian order are waveforms for the metric and vector fields far from a nearly Newtonian system and the rate of energy radiated by the system. The…
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This work concerns the loss of energy of a material system due to gravitational radiation in Einstein-aether theory-an alternative theory of gravity in which the metric couples to a dynamical, timelike, unit-norm vector field. Derived to lowest post-Newtonian order are waveforms for the metric and vector fields far from a nearly Newtonian system and the rate of energy radiated by the system. The expressions depend on the quadrupole moment of the source, as in standard general relativity, but also contain monopolar and dipolar terms. There exists a one-parameter family of Einstein-aether theories for which only the quadrupolar contribution is present, and for which the expression for the damping rate is identical to that of general relativity to the order worked to here. This family cannot yet be declared observationally viable, since effects due to the strong internal fields of bodies in the actual systems used to test the damping rate are not included.
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Submitted 23 September, 2008; v1 submitted 1 February, 2006;
originally announced February 2006.