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arxiv: 2607.06353 · v1 · pith:AFF47JK6 · submitted 2026-07-07 · hep-ex

Efficiency measurements of GEM GE1/1 chambers in the upgraded CMS Endcap Muon System using 2023 collision data at sqrt{s}=13.6 TeV

M. Abbas , S. Abbott , M. Abbrescia , H. Abdalla , A. Abdelalim , S. AbuZeid , D. Aebi , A. Ahmad
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W. Ahmed C. Aim\`e T. Akhter G. Alasfour M. Ali B. Alsufyani A. Aravind C. Aruta I. Asghar P. Aspell C. Avila Y. Ban R. Band S. Bansal N. Beni L. Benussi T. Beyrouthy V. Bhatnagar M. Bianco S. Bianco K. Black O. Bouhali S. Brachet A. Braghieri M. Brunoldi M. Buonsante S. Butalla A. Cagnotta S. Calzaferri R. Campagnola M. Caponero F. Cassese N. Cavallo B. Chauhan S. S. Chauhan B. Choudhary M. Citron S. Colafranceschi A. Colaleo A. Conde Garcia A. Datta P. Danev A. De Iorio G. De Lentdecker G. De Robertis W. Dharmaratna C. Di Fraia D. Dobur E. Ehlert R. Erbacher P. Everaerts F. Fabozzi F. Fallavollita L. Favilla M. Franco C. Galloni L. Generoso Y. Gharbia P. Giacomelli S. G. Gigli J. Gilmore G. Gokbulut R. Hadjiiska T. Hebbeker K. Hoepfner M. Hohlmann H. Hoorani T. Huang P. Iaydjiev A. Iorio F. Ivone W. Jang J. Jaramillo E. Juska B. Kailasapathy T. Kamon Y. Kang P. Karchin S. Keshri D. Kim H. Kim J. Kim M. Kim S. Kim A. Kumar S. Kumar N. Lacalamita J. S. H. Lee Q. Li Z. Li F. Licciulli L. Lista K. Liyanage F. Loddo L. Longo M. Luhach M. Maggi N. Majumdar K. Malagalage S. Malhotra S. Martiradonna M. Merschmeyer M. Misheva G. Mitev G. Mocellin S. Muhammad S. Mukhopadhyay M. Naimuddin F. Nenna S. Nuzzo R. Oliveira S. Ostrom M. Otkur E. Paoletti P. Paolucci I. C. Park G. Passeggio A. Pellecchia N. Perera L. Petre B. Philipps D. Piccolo D. Pierluigi C. Prakash R. Radogna A. Ranieri D. Rathjens B. Regnery C. Riccardi M. Rodr\'iguez B. Rossi P. Rout A. A. Ruales J. D. Ruiz-\`Alvarez A. Russo A. Safonov A. K. Sahota M. Saini D. Saltzberg G. Saviano A. Schmidt A. Sharma T. Sheokand M. Shopova F. M. Simone J. Singh K. Skovpen U. Sonnadara A. Stamerra G. Sultanov Z. Szillasi D. Teague R. Tesauro D. Teyssier S. Thakur D. Troiano M. Tytgat I. Vai R. Venditti P. Verwilligen W. Vetens A. K. Virdi P. Vitulo A. Wajid D. Wang A. Warden I. J. Watson N. Wickramage D. D. C. Wickramarathna E. Yanes U. Yang Y. Yang H. D. Yoo I. Yoon Z. You I. Yu S. Zaleski A. Zaza C. Zhou
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classification hep-ex
keywords detectorsmuonefficiencyaveragecollisiondatadetectionsqrt
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The CMS experiment at the Large Hadron Collider employs Gas Electron Multiplier (GEM) detectors, a technology based on gaseous ionization, as one of the muon detectors. The muon spectrometer is being upgraded to handle the increased muon flux in the forward region. This study analyzes muon detection efficiency in the GE1/1 triple-GEM detector, using 2023 proton-proton collision data at $\sqrt{s}=13.6$ TeV. A dataset enriched with muons from Z boson decay, with a total recorded luminosity of 17.8 fb$^{-1}$ has been used for this study. The detection efficiency of 137 GEM detectors are measured using muon trajectories established using other detectors in the tracking and muon systems, without use of the GEM detectors. The average efficiency of 137 GEM detectors is $\sim$93.3$\%$. A subset of 108 detectors that had no shorts were operated at the nominal HV working point with average efficiency of $\sim$96$\%$. Efficiency is found to be unaffected by the number of p-p interactions per bunch crossing (pile-up).

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