Showing 1–18 of 18 results for author: Charlot, C

ECFA Higgs, electroweak, and top Factory Study

Authors: H. Abidi, J. A. Aguilar-Saavedra, S. Airen, S. Ajmal, M. Al-Thakeel, G. L. Alberghi, J. Alcaraz Maestre, J. Alimena, S. Alshamaily, J. Altmann, W. Altmannshofer, Y. Amhis, A. Amiri, A. Andreazza, S. Antusch, O. Arnaez, K. A. Assamagan, S. Aumiller, K. Azizi, P. Azzi, P. Azzurri, E. Bagnaschi, Z. Baharyioon, H. Bahl, V. Balagura , et al. (352 additional authors not shown)

Abstract: The ECFA Higgs, electroweak, and top Factory Study ran between 2021 and 2025 as a broad effort across the experimental and theoretical particle physics communities, bringing together participants from many different proposed future collider projects. Activities across three main working groups advanced the joint development of tools and analysis techniques, fostered new considerations of detector… ▽ More The ECFA Higgs, electroweak, and top Factory Study ran between 2021 and 2025 as a broad effort across the experimental and theoretical particle physics communities, bringing together participants from many different proposed future collider projects. Activities across three main working groups advanced the joint development of tools and analysis techniques, fostered new considerations of detector design and optimisation, and led to a new set of studies resulting in improved projected sensitivities across a wide physics programme. This report demonstrates the significant expansion in the state-of-the-art understanding of the physics potential of future e+e- Higgs, electroweak, and top factories, and has been submitted as input to the 2025 European Strategy for Particle Physics Update. △ Less

Submitted 17 October, 2025; v1 submitted 18 June, 2025; originally announced June 2025.

Report number: CERN-2025-005

Future Circular Collider Feasibility Study Report: Volume 2, Accelerators, Technical Infrastructure and Safety

Authors: M. Benedikt, F. Zimmermann, B. Auchmann, W. Bartmann, J. P. Burnet, C. Carli, A. Chancé, P. Craievich, M. Giovannozzi, C. Grojean, J. Gutleber, K. Hanke, A. Henriques, P. Janot, C. Lourenço, M. Mangano, T. Otto, J. Poole, S. Rajagopalan, T. Raubenheimer, E. Todesco, L. Ulrici, T. Watson, G. Wilkinson, A. Abada , et al. (1439 additional authors not shown)

Abstract: In response to the 2020 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) Feasibility Study was launched as an international collaboration hosted by CERN. This report describes the FCC integrated programme, which consists of two stages: an electron-positron collider (FCC-ee) in the first phase, serving as a high-luminosity Higgs, top, and electroweak factory;… ▽ More In response to the 2020 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) Feasibility Study was launched as an international collaboration hosted by CERN. This report describes the FCC integrated programme, which consists of two stages: an electron-positron collider (FCC-ee) in the first phase, serving as a high-luminosity Higgs, top, and electroweak factory; followed by a proton-proton collider (FCC-hh) at the energy frontier in the second phase. FCC-ee is designed to operate at four key centre-of-mass energies: the Z pole, the WW production threshold, the ZH production peak, and the top/anti-top production threshold - delivering the highest possible luminosities to four experiments. Over 15 years of operation, FCC-ee will produce more than 6 trillion Z bosons, 200 million WW pairs, nearly 3 million Higgs bosons, and 2 million top anti-top pairs. Precise energy calibration at the Z pole and WW threshold will be achieved through frequent resonant depolarisation of pilot bunches. The sequence of operation modes remains flexible. FCC-hh will operate at a centre-of-mass energy of approximately 85 TeV - nearly an order of magnitude higher than the LHC - and is designed to deliver 5 to 10 times the integrated luminosity of the HL-LHC. Its mass reach for direct discovery extends to several tens of TeV. In addition to proton-proton collisions, FCC-hh is capable of supporting ion-ion, ion-proton, and lepton-hadron collision modes. This second volume of the Feasibility Study Report presents the complete design of the FCC-ee collider, its operation and staging strategy, the full-energy booster and injector complex, required accelerator technologies, safety concepts, and technical infrastructure. It also includes the design of the FCC-hh hadron collider, development of high-field magnets, hadron injector options, and key technical systems for FCC-hh. △ Less

Submitted 25 April, 2025; originally announced May 2025.

Comments: 627 pages. Please address any comment or request to fcc.secretariat@cern.ch

Report number: CERN-FCC-ACC-2025-0004

Future Circular Collider Feasibility Study Report: Volume 3, Civil Engineering, Implementation and Sustainability

Authors: M. Benedikt, F. Zimmermann, B. Auchmann, W. Bartmann, J. P. Burnet, C. Carli, A. Chancé, P. Craievich, M. Giovannozzi, C. Grojean, J. Gutleber, K. Hanke, A. Henriques, P. Janot, C. Lourenço, M. Mangano, T. Otto, J. Poole, S. Rajagopalan, T. Raubenheimer, E. Todesco, L. Ulrici, T. Watson, G. Wilkinson, P. Azzi , et al. (1439 additional authors not shown)

Abstract: Volume 3 of the FCC Feasibility Report presents studies related to civil engineering, the development of a project implementation scenario, and environmental and sustainability aspects. The report details the iterative improvements made to the civil engineering concepts since 2018, taking into account subsurface conditions, accelerator and experiment requirements, and territorial considerations. I… ▽ More Volume 3 of the FCC Feasibility Report presents studies related to civil engineering, the development of a project implementation scenario, and environmental and sustainability aspects. The report details the iterative improvements made to the civil engineering concepts since 2018, taking into account subsurface conditions, accelerator and experiment requirements, and territorial considerations. It outlines a technically feasible and economically viable civil engineering configuration that serves as the baseline for detailed subsurface investigations, construction design, cost estimation, and project implementation planning. Additionally, the report highlights ongoing subsurface investigations in key areas to support the development of an improved 3D subsurface model of the region. The report describes development of the project scenario based on the 'avoid-reduce-compensate' iterative optimisation approach. The reference scenario balances optimal physics performance with territorial compatibility, implementation risks, and costs. Environmental field investigations covering almost 600 hectares of terrain - including numerous urban, economic, social, and technical aspects - confirmed the project's technical feasibility and contributed to the preparation of essential input documents for the formal project authorisation phase. The summary also highlights the initiation of public dialogue as part of the authorisation process. The results of a comprehensive socio-economic impact assessment, which included significant environmental effects, are presented. Even under the most conservative and stringent conditions, a positive benefit-cost ratio for the FCC-ee is obtained. Finally, the report provides a concise summary of the studies conducted to document the current state of the environment. △ Less

Submitted 25 April, 2025; originally announced May 2025.

Comments: 357 pages. Please address any comment or request to fcc.secretariat@cern.ch

Report number: CERN-FCC-ACC-2025-0003

Future Circular Collider Feasibility Study Report: Volume 1, Physics, Experiments, Detectors

Authors: M. Benedikt, F. Zimmermann, B. Auchmann, W. Bartmann, J. P. Burnet, C. Carli, A. Chancé, P. Craievich, M. Giovannozzi, C. Grojean, J. Gutleber, K. Hanke, A. Henriques, P. Janot, C. Lourenço, M. Mangano, T. Otto, J. Poole, S. Rajagopalan, T. Raubenheimer, E. Todesco, L. Ulrici, T. Watson, G. Wilkinson, P. Azzi , et al. (1439 additional authors not shown)

Abstract: Volume 1 of the FCC Feasibility Report presents an overview of the physics case, experimental programme, and detector concepts for the Future Circular Collider (FCC). This volume outlines how FCC would address some of the most profound open questions in particle physics, from precision studies of the Higgs and EW bosons and of the top quark, to the exploration of physics beyond the Standard Model.… ▽ More Volume 1 of the FCC Feasibility Report presents an overview of the physics case, experimental programme, and detector concepts for the Future Circular Collider (FCC). This volume outlines how FCC would address some of the most profound open questions in particle physics, from precision studies of the Higgs and EW bosons and of the top quark, to the exploration of physics beyond the Standard Model. The report reviews the experimental opportunities offered by the staged implementation of FCC, beginning with an electron-positron collider (FCC-ee), operating at several centre-of-mass energies, followed by a hadron collider (FCC-hh). Benchmark examples are given of the expected physics performance, in terms of precision and sensitivity to new phenomena, of each collider stage. Detector requirements and conceptual designs for FCC-ee experiments are discussed, as are the specific demands that the physics programme imposes on the accelerator in the domains of the calibration of the collision energy, and the interface region between the accelerator and the detector. The report also highlights advances in detector, software and computing technologies, as well as the theoretical tools /reconstruction techniques that will enable the precision measurements and discovery potential of the FCC experimental programme. This volume reflects the outcome of a global collaborative effort involving hundreds of scientists and institutions, aided by a dedicated community-building coordination, and provides a targeted assessment of the scientific opportunities and experimental foundations of the FCC programme. △ Less

Submitted 25 April, 2025; originally announced May 2025.

Comments: 290 pages. Please address any comment or request to fcc.secretariat@cern.ch

Report number: CERN-FCC-PHYS-2025-0002

Loop-induced $ZZ$ production at the LHC: an improved description by matrix-element matching

Authors: Congqiao Li, Ying An, Claude Charlot, Roberto Covarelli, Zhe Guan, Qiang Li

Abstract: Loop-induced $ZZ$ production can be enhanced by the large gluon flux at the LHC, and thus should be taken into account in relevant experimental analyses. We present for the first time the results of a fully exclusive simulation based on the matrix elements for loop-induced $ZZ + 0,1,2$-parton processes at leading order, matched to parton showers. The new description is studied and validated by com… ▽ More Loop-induced $ZZ$ production can be enhanced by the large gluon flux at the LHC, and thus should be taken into account in relevant experimental analyses. We present for the first time the results of a fully exclusive simulation based on the matrix elements for loop-induced $ZZ + 0,1,2$-parton processes at leading order, matched to parton showers. The new description is studied and validated by comparing it with well-established simulation with jets from parton showers. We find that the matched simulation provides a state-of-the-art description of the final state jets. We also briefly discuss the physics impact on vector boson scattering (VBS) measurements at the LHC, where event yields are found to be smaller by about 40% in a VBS $ZZjj$ baseline search region, compared to previous simulations. We hence advocate relevant analyses to employ a more accurate jet description for the modeling of the loop-induced process. △ Less

Submitted 2 December, 2020; v1 submitted 23 June, 2020; originally announced June 2020.

Comments: 8 pages, 4 figures

Journal ref: Phys. Rev. D 102, 116003 (2020)

VBSCan Mid-Term Scientific Meeting

Authors: Julien Baglio, Alessandro Ballestrero, Riccardo Bellan, Carsten Bittrich, Simon Brass, Ilaria Brivio, Diogo Buarque Franzosi, Claude Charlot, Roberto Covarelli, Javier Cuevas, Michele Gallinaro, Raquel Gomez-Ambrosio, Pietro Govoni, Michele Grossi, Alexander Karlberg, Aysel Kayis Topaksu, Borut Kersevan, Wolfgang Kilian, Patrick Kirchgaesser, Rafael L. Delgado, Kristin Lohwasser, Narei Lorenzo Martinez, Ezio Maina, Olivier Mattelaer, Ankita Mehta , et al. (26 additional authors not shown)

Abstract: This document summarises the talks and discussions happened during the VBSCan Mid-Term Scientific Meeting workshop. The VBSCan COST action is dedicated to the coordinated study of vector boson scattering (VBS) from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders. This document summarises the talks and discussions happened during the VBSCan Mid-Term Scientific Meeting workshop. The VBSCan COST action is dedicated to the coordinated study of vector boson scattering (VBS) from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders. △ Less

Submitted 1 April, 2020; originally announced April 2020.

Comments: Editors: I.Brivio, C.Charlot, R.Covarelli, R.L.Delgado, K.Lohwasser, M.Pellen, M.Slawinska, G.Ortona, K.Ozdemir, C.Petridou, I.Puljak, M.Zaro. Proceedings for the VBSCan Mid-Term Scientific Meeting of the VBSCan COST action

Report number: VBSCan-PUB-02-20, UWThPh 2020-3, IFIRSE-TH-2019-6, DESY 20-026, Cavendish-HEP-20/02, TIF-UNIMI-2020-13

VBSCan Thessaloniki 2018 Workshop Summary

Authors: Riccardo Bellan, Jakob Beyer, Carsten Bittrich, Giacomo Boldrini, Ilaria Brivio, Lucrezia Stella Bruni, Diogo Buarque Franzosi, Claude Charlot, Vitaliano Ciulli, Roberto Covarelli, Duje Giljanovic, Giulia Gonella, Pietro Govoni, Philippe Gras, Michele Grossi, Tim Herrmann, Jan Kalinowski, Alexander Karlberg, Kimmo Kallonen, Eirini Kasimi, Aysel Kayis Topaksu, Borut Kersevan, Henning Kirschenmann, Michael Kobel, Konstantinos Kordas , et al. (39 additional authors not shown)

Abstract: This document reports the first year of activity of the VBSCan COST Action network, as summarised by the talks and discussions happened during the VBSCan Thessaloniki 2018 workshop. The VBSCan COST action is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered b… ▽ More This document reports the first year of activity of the VBSCan COST Action network, as summarised by the talks and discussions happened during the VBSCan Thessaloniki 2018 workshop. The VBSCan COST action is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders. △ Less

Submitted 26 June, 2019; originally announced June 2019.

Comments: Editors: Lucrezia Stella Bruni, Roberto Covarelli, Pietro Govoni, Piergiulio Lenzi, Narei Lorenzo-Martinez, Joany Manjarres, Matthias Ulrich Mozer, Giacomo Ortona, Mathieu Pellen, Daniela Rebuzzi, Magdalena Slawinska, Marco Zaro. Proceedings for the second annual meeting of the VBSCan COST action

Report number: VBSCAN-PUB-05-19, DESY 19-108, Nikhef/2019-025, UWThPh 2019-20

Standard Model Physics at the HL-LHC and HE-LHC

Authors: P. Azzi, S. Farry, P. Nason, A. Tricoli, D. Zeppenfeld, R. Abdul Khalek, J. Alimena, N. Andari, L. Aperio Bella, A. J. Armbruster, J. Baglio, S. Bailey, E. Bakos, A. Bakshi, C. Baldenegro, F. Balli, A. Barker, W. Barter, J. de Blas, F. Blekman, D. Bloch, A. Bodek, M. Boonekamp, E. Boos, J. D. Bossio Sola , et al. (201 additional authors not shown)

Abstract: The successful operation of the Large Hadron Collider (LHC) and the excellent performance of the ATLAS, CMS, LHCb and ALICE detectors in Run-1 and Run-2 with $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV as well as the giant leap in precision calculations and modeling of fundamental interactions at hadron colliders have allowed an extraordinary breadth of physics studies including… ▽ More The successful operation of the Large Hadron Collider (LHC) and the excellent performance of the ATLAS, CMS, LHCb and ALICE detectors in Run-1 and Run-2 with $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV as well as the giant leap in precision calculations and modeling of fundamental interactions at hadron colliders have allowed an extraordinary breadth of physics studies including precision measurements of a variety physics processes. The LHC results have so far confirmed the validity of the Standard Model of particle physics up to unprecedented energy scales and with great precision in the sectors of strong and electroweak interactions as well as flavour physics, for instance in top quark physics. The upgrade of the LHC to a High Luminosity phase (HL-LHC) at 14 TeV center-of-mass energy with 3 ab$^{-1}$ of integrated luminosity will probe the Standard Model with even greater precision and will extend the sensitivity to possible anomalies in the Standard Model, thanks to a ten-fold larger data set, upgraded detectors and expected improvements in the theoretical understanding. This document summarises the physics reach of the HL-LHC in the realm of strong and electroweak interactions and top quark physics, and provides a glimpse of the potential of a possible further upgrade of the LHC to a 27 TeV $pp$ collider, the High-Energy LHC (HE-LHC), assumed to accumulate an integrated luminosity of 15 ab$^{-1}$. △ Less

Submitted 20 December, 2019; v1 submitted 11 February, 2019; originally announced February 2019.

Comments: Report from Working Group 1 on the Physics of the HL-LHC, and Perspectives at the HE-LHC

Report number: CERN-LPCC-2018-03

Vector boson scattering: Recent experimental and theory developments

Authors: C. F. Anders, A. Ballestrero, J. Balz, R. Bellan, B. Biedermann, C. Bittrich, S. Braß, I. Brivio, L. S. Bruni, J. Butterworth, M. Cacciari, A. Cardini, C. Charlot, V. Ciulli, R. Covarelli, J. Cuevas, A. Denner, L. Di Ciaccio, S. Dittmaier, S. Duric, S. Farrington, P. Ferrari, P. Ferreira Silva, L. Finco, D. Giljanović , et al. (89 additional authors not shown)

Abstract: This document summarises the talks and discussions happened during the VBSCan Split17 workshop, the first general meeting of the VBSCan COST Action network. This collaboration is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particl… ▽ More This document summarises the talks and discussions happened during the VBSCan Split17 workshop, the first general meeting of the VBSCan COST Action network. This collaboration is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders. △ Less

Submitted 13 December, 2018; v1 submitted 12 January, 2018; originally announced January 2018.

Comments: 41 pages including references, 11 figures, summary of the talks and discussions happened during the first VBSCan workshop: https://indico.cern.ch/event/629638/. Note that in v2 the original title "VBSCan Split 2017 Workshop Summary" has been modified according to the published version

Report number: VBSCan-PUB-01-17

Journal ref: Rev.Phys. 3 (2018) 44-63

Observation of the rare $B^0_s\toμ^+μ^-$ decay from the combined analysis of CMS and LHCb data

Authors: The CMS, LHCb Collaborations, :, V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, M. Friedl, R. Frühwirth, V. M. Ghete, C. Hartl, N. Hörmann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knünz, M. Krammer, I. Krätschmer, D. Liko, I. Mikulec, D. Rabady, B. Rahbaran , et al. (2807 additional authors not shown)

Abstract: A joint measurement is presented of the branching fractions $B^0_s\toμ^+μ^-$ and $B^0\toμ^+μ^-$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $B^0_s\toμ^+μ^-$ decay, with a statistical significance exceeding six sta… ▽ More A joint measurement is presented of the branching fractions $B^0_s\toμ^+μ^-$ and $B^0\toμ^+μ^-$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $B^0_s\toμ^+μ^-$ decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far. Furthermore, evidence for the $B^0\toμ^+μ^-$ decay is obtained with a statistical significance of three standard deviations. The branching fraction measurements are statistically compatible with SM predictions and impose stringent constraints on several theories beyond the SM. △ Less

Submitted 17 August, 2015; v1 submitted 17 November, 2014; originally announced November 2014.

Comments: Correspondence should be addressed to cms-and-lhcb-publication-committees@cern.ch

Report number: CERN-PH-EP-2014-220, CMS-BPH-13-007, LHCb-PAPER-2014-049

Journal ref: Nature 522, 68-72 (04 June 2015)

Radiation hardness qualification of PbWO4 scintillation crystals for the CMS Electromagnetic Calorimeter

Authors: The CMS Electromagnetic Calorimeter Group, P. Adzic, N. Almeida, D. Andelin, I. Anicin, Z. Antunovic, R. Arcidiacono, M. W. Arenton, E. Auffray, S. Argiro, A. Askew, S. Baccaro, S. Baffioni, M. Balazs, D. Bandurin, D. Barney, L. M. Barone, A. Bartoloni, C. Baty, S. Beauceron, K. W. Bell, C. Bernet, M. Besancon, B. Betev, R. Beuselinck , et al. (245 additional authors not shown)

Abstract: Ensuring the radiation hardness of PbWO4 crystals was one of the main priorities during the construction of the electromagnetic calorimeter of the CMS experiment at CERN. The production on an industrial scale of radiation hard crystals and their certification over a period of several years represented a difficult challenge both for CMS and for the crystal suppliers. The present article reviews t… ▽ More Ensuring the radiation hardness of PbWO4 crystals was one of the main priorities during the construction of the electromagnetic calorimeter of the CMS experiment at CERN. The production on an industrial scale of radiation hard crystals and their certification over a period of several years represented a difficult challenge both for CMS and for the crystal suppliers. The present article reviews the related scientific and technological problems encountered. △ Less

Submitted 21 December, 2009; originally announced December 2009.

Comments: 24 pages, 19 figures, available on CMS information server at http://cms.cern.ch/iCMS/

Report number: CMS Note 2009/016

Journal ref: JINST 5:P03010,2010

Higgs search in H$\to$ZZ/WW decay channels with the CMS detector

Authors: C. Charlot

Abstract: A prospective analysis for the search of the Standard Model Higgs boson decaying in vector boson pairs is presented with the CMS experiment in the context of the initial luminosity at the CERN LHC pp collider. Monte Carlo data corresponding to an integrated luminosity of up to 1 fb$^{-1}$ are analysed and the expected significance for a Standard Model-like Higgs boson in these channels is establ… ▽ More A prospective analysis for the search of the Standard Model Higgs boson decaying in vector boson pairs is presented with the CMS experiment in the context of the initial luminosity at the CERN LHC pp collider. Monte Carlo data corresponding to an integrated luminosity of up to 1 fb$^{-1}$ are analysed and the expected significance for a Standard Model-like Higgs boson in these channels is established. △ Less

Submitted 9 June, 2009; originally announced June 2009.

Comments: 4 pages, 4 figures, proceedings of the Lake Louise Winter Institute 2009, 16th-21st February 2009, Alberta, Canada

Electron/Photon identification in ATLAS and CMS

Authors: C. Charlot

Abstract: Recent studies in ATLAS and CMS experiments for the reconstruction and identification of electrons and photons using full Monte Carlo and testbeam data are reported Recent studies in ATLAS and CMS experiments for the reconstruction and identification of electrons and photons using full Monte Carlo and testbeam data are reported △ Less

Submitted 16 September, 2007; originally announced September 2007.

Comments: Talk given at the Hadron Collider Physic Symposium 2006 (HCP2006), Durham, NC on behalf of ATLAS and CMS collaborations

Running CMS software on GRID Testbeds

Authors: D. Bonacorsi, P. Capiluppi, A. Fanfani, C. Grandi, M. Corvo, F. Fanzago, M. Sgaravatto, M. Verlato, C. Charlot, I. Semeniuok, D. Colling, B. MacEvoy, H. Tallini, M. Biasotto, S. Fantinel, E. Leonardi, A. Sciaba', O. Maroney, I. Augustin, E. Laure, M. Schulz, H. Stockinger, V. Lefebure, S. Burke, J. J. Blaising , et al. (5 additional authors not shown)

Abstract: Starting in the middle of November 2002, the CMS experiment undertook an evaluation of the European DataGrid Project (EDG) middleware using its event simulation programs. A joint CMS-EDG task force performed a "stress test" by submitting a large number of jobs to many distributed sites. The EDG testbed was complemented with additional CMS-dedicated resources. A total of ~ 10000 jobs consisting o… ▽ More Starting in the middle of November 2002, the CMS experiment undertook an evaluation of the European DataGrid Project (EDG) middleware using its event simulation programs. A joint CMS-EDG task force performed a "stress test" by submitting a large number of jobs to many distributed sites. The EDG testbed was complemented with additional CMS-dedicated resources. A total of ~ 10000 jobs consisting of two different computational types were submitted from four different locations in Europe over a period of about one month. Nine sites were active, providing integrated resources of more than 500 CPUs and about 5 TB of disk space (with the additional use of two Mass Storage Systems). Descriptions of the adopted procedures, the problems encountered and the corresponding solutions are reported. Results and evaluations of the test, both from the CMS and the EDG perspectives, are described. △ Less

Submitted 4 June, 2003; originally announced June 2003.

Comments: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 7 pages, pdf file. PSN MOCT010

Journal ref: ECONF C0303241:MOCT010A,2003

Twelve Ways to Build CMS Crossings from ROOT Files

Authors: D. Chamont, C. Charlot

Abstract: The simulation of CMS raw data requires the random selection of one hundred and fifty pileup events from a very large set of files, to be superimposed in memory to the signal event. The use of ROOT I/O for that purpose is quite unusual: the events are not read sequentially but pseudo-randomly, they are not processed one by one in memory but by bunches, and they do not contain orthodox ROOT objec… ▽ More The simulation of CMS raw data requires the random selection of one hundred and fifty pileup events from a very large set of files, to be superimposed in memory to the signal event. The use of ROOT I/O for that purpose is quite unusual: the events are not read sequentially but pseudo-randomly, they are not processed one by one in memory but by bunches, and they do not contain orthodox ROOT objects but many foreign objects and templates. In this context, we have compared the performance of ROOT containers versus the STL vectors, and the use of trees versus a direct storage of containers. The strategy with best performances is by far the one using clones within trees, but it stays hard to tune and very dependant on the exact use-case. The use of STL vectors could bring more easily similar performances in a future ROOT release. △ Less

Submitted 12 June, 2003; originally announced June 2003.

Comments: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 8 pages, LaTeX, 1 eps figures. PSN TUKT004

ACM Class: H.2.4

OVAL: the CMS Testing Robot

Authors: D. Chamont, C. Charlot

Abstract: Oval is a testing tool which help developers to detect unexpected changes in the behavior of their software. It is able to automatically compile some test programs, to prepare on the fly the needed configuration files, to run the tests within a specified Unix environment, and finally to analyze the output and check expectations. Oval does not provide utility code to help writing the tests, there… ▽ More Oval is a testing tool which help developers to detect unexpected changes in the behavior of their software. It is able to automatically compile some test programs, to prepare on the fly the needed configuration files, to run the tests within a specified Unix environment, and finally to analyze the output and check expectations. Oval does not provide utility code to help writing the tests, therefore it is quite independant of the programming/scripting language of the software to be tested. It can be seen as a kind of robot which apply the tests and warn about any unexpected change in the output. Oval was developed by the LLR laboratory for the needs of the CMS experiment, and it is now recommended by the CERN LCG project. △ Less

Submitted 12 June, 2003; originally announced June 2003.

Comments: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 5 pages, LaTeX, 0 eps figures. PSN MOJT005

ACM Class: D.2.5

HEP Applications Evaluation of the EDG Testbed and Middleware

Authors: I. Augustin, F. Carminati, J. Closier, E. van Herwijnen, J. J. Blaising, D. Boutigny, C. Charlot, V. Garonne, A. Tsaregorodtsev, K. Bos, J. Templon, P. Capiluppi, A. Fanfani, R. Barbera, G. Negri, L. Perini, S. Resconi, M. Sitta, M. Reale, D. Vicinanza, S. Bagnasco, P. Cerello, A. Sciaba, O. Smirnova, D. Colling , et al. (2 additional authors not shown)

Abstract: Workpackage 8 of the European Datagrid project was formed in January 2001 with representatives from the four LHC experiments, and with experiment independent people from five of the six main EDG partners. In September 2002 WP8 was strengthened by the addition of effort from BaBar and D0. The original mandate of WP8 was, following the definition of short- and long-term requirements, to port exper… ▽ More Workpackage 8 of the European Datagrid project was formed in January 2001 with representatives from the four LHC experiments, and with experiment independent people from five of the six main EDG partners. In September 2002 WP8 was strengthened by the addition of effort from BaBar and D0. The original mandate of WP8 was, following the definition of short- and long-term requirements, to port experiment software to the EDG middleware and testbed environment. A major additional activity has been testing the basic functionality and performance of this environment. This paper reviews experiences and evaluations in the areas of job submission, data management, mass storage handling, information systems and monitoring. It also comments on the problems of remote debugging, the portability of code, and scaling problems with increasing numbers of jobs, sites and nodes. Reference is made to the pioneeering work of Atlas and CMS in integrating the use of the EDG Testbed into their data challenges. A forward look is made to essential software developments within EDG and to the necessary cooperation between EDG and LCG for the LCG prototype due in mid 2003. △ Less

Submitted 5 June, 2003; originally announced June 2003.

Comments: Talk from the 2003 Computing in High Energy and Nuclear Physics Conference (CHEP03), La Jolla, CA, USA, March 2003, 7 pages. PSN THCT003

ACM Class: J.2

Journal ref: ECONF C0303241:THCT003,2003

Report of the GDR working group on the R-parity violation

Authors: R. Barbier, C. Berat, M. Besancon, P. Binetruy, G. Bordes, F. Brochu, P. Bruel, F. Charles, C. Charlot, M. Chemtob, P. Coyle, M. David, E. Dudas, D. Fouchez, C. Grojean, M. Jacquet, S. Katsanevas, S. Lavignac, F. Ledroit, R. Lopez, A. Mirea, G. Moreau, C. Mulet-Marquis, E. Nagy, F. Naraghi , et al. (7 additional authors not shown)

Abstract: This report summarizes the work of the "R-parity violation group" of the French Research Network (GDR) in Supersymmetry, concerning the physics of supersymmetric models without conservation of R-parity at HERA, LEP, Tevatron and LHC and limits on R-parity violating couplings from various processes. The report includes a discussion of the recent searches at the HERA experiment, prospects for new… ▽ More This report summarizes the work of the "R-parity violation group" of the French Research Network (GDR) in Supersymmetry, concerning the physics of supersymmetric models without conservation of R-parity at HERA, LEP, Tevatron and LHC and limits on R-parity violating couplings from various processes. The report includes a discussion of the recent searches at the HERA experiment, prospects for new experiments, a review of the existing limits, and also theoretically motivated alternatives to R-parity and a brief discussion on the implications of R-parity violation on the neutrino masses. △ Less

Submitted 2 October, 1998; originally announced October 1998.

Comments: 60 pages, LaTeX, 22 figures, 2 tables