Search for decays of stopped long-lived particles produced in proton–proton collisions at √s = 8 TeV
A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at ti...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Springer-Verlag
2015
|
| Online Access: | http://hdl.handle.net/1721.1/97159 https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 |
| _version_ | 1826189924376772608 |
|---|---|
| author | Apyan, Aram Barbieri, Richard Alexander Busza, Wit Cali, Ivan Amos Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Yen-Jie Levin, Andrew Michael Paus, Christoph M. E. Ralph, Duncan Kelley Stephans, George S. F. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, Mingming Zanetti, Marco Chan, M. Luckey Jr, P David Roland, Christof E Roland, Gunther M Sumorok, Konstanty C Wyslouch, Victoria |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Apyan, Aram Barbieri, Richard Alexander Busza, Wit Cali, Ivan Amos Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Yen-Jie Levin, Andrew Michael Paus, Christoph M. E. Ralph, Duncan Kelley Stephans, George S. F. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, Mingming Zanetti, Marco Chan, M. Luckey Jr, P David Roland, Christof E Roland, Gunther M Sumorok, Konstanty C Wyslouch, Victoria |
| author_sort | Apyan, Aram |
| collection | MIT |
| description | A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton–proton collisions. Using a data set corresponding to an integrated luminosity of 18.6 fb[superscript -1] of 8 TeV proton–proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13.2[+3.6 over −2.5] events. Limits are presented at 95% confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≲1000 GeV and a top squark with mass ≲525 GeV are excluded, for lifetimes between 1 μs and 1000s. These results are the most stringent constraints on stopped particles to date. |
| first_indexed | 2024-09-23T08:30:06Z |
| format | Article |
| id | mit-1721.1/97159 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:30:06Z |
| publishDate | 2015 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/971592023-02-26T08:08:43Z Search for decays of stopped long-lived particles produced in proton–proton collisions at √s = 8 TeV Apyan, Aram Barbieri, Richard Alexander Busza, Wit Cali, Ivan Amos Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Yen-Jie Levin, Andrew Michael Paus, Christoph M. E. Ralph, Duncan Kelley Stephans, George S. F. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, Mingming Zanetti, Marco Chan, M. Luckey Jr, P David Roland, Christof E Roland, Gunther M Sumorok, Konstanty C Wyslouch, Victoria Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Massachusetts Institute of Technology. School of Science Apyan, Aram Barbieri, Richard Alexander Busza, Wit Cali, Ivan Amos Chan, Matthew Hans Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Yen-Jie Levin, Andrew Michael Luckey, P. David, Jr. Paus, Christoph M. E. Ralph, Duncan Kelley Roland, Christof E. Roland, Gunther M. Stephans, George S. F. Sumorok, Konstanty C. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, Mingming Zanetti, Marco Zhukova, Victoria A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton–proton collisions. Using a data set corresponding to an integrated luminosity of 18.6 fb[superscript -1] of 8 TeV proton–proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13.2[+3.6 over −2.5] events. Limits are presented at 95% confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≲1000 GeV and a top squark with mass ≲525 GeV are excluded, for lifetimes between 1 μs and 1000s. These results are the most stringent constraints on stopped particles to date. United States. Dept. of Energy National Science Foundation (U.S.) Alfred P. Sloan Foundation 2015-06-02T18:13:24Z 2015-06-02T18:13:24Z 2015-04 2015-01 Article http://purl.org/eprint/type/JournalArticle 1434-6044 1434-6052 http://hdl.handle.net/1721.1/97159 Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Ero, et al. “Search for Decays of Stopped Long-Lived Particles Produced in Proton–proton Collisions at √s = 8 TeV.” Eur. Phys. J. C 75, no. 4 (April 2015). © 2015 CERN for the benefit of the CMS collaboration https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 en_US http://dx.doi.org/10.1140/epjc/s10052-015-3367-z The European Physical Journal C Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer-Verlag |
| spellingShingle | Apyan, Aram Barbieri, Richard Alexander Busza, Wit Cali, Ivan Amos Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Yen-Jie Levin, Andrew Michael Paus, Christoph M. E. Ralph, Duncan Kelley Stephans, George S. F. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, Mingming Zanetti, Marco Chan, M. Luckey Jr, P David Roland, Christof E Roland, Gunther M Sumorok, Konstanty C Wyslouch, Victoria Search for decays of stopped long-lived particles produced in proton–proton collisions at √s = 8 TeV |
| title | Search for decays of stopped long-lived particles produced in proton–proton collisions at √s = 8 TeV |
| title_full | Search for decays of stopped long-lived particles produced in proton–proton collisions at √s = 8 TeV |
| title_fullStr | Search for decays of stopped long-lived particles produced in proton–proton collisions at √s = 8 TeV |
| title_full_unstemmed | Search for decays of stopped long-lived particles produced in proton–proton collisions at √s = 8 TeV |
| title_short | Search for decays of stopped long-lived particles produced in proton–proton collisions at √s = 8 TeV |
| title_sort | search for decays of stopped long lived particles produced in proton proton collisions at √s 8 tev |
| url | http://hdl.handle.net/1721.1/97159 https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 |
| work_keys_str_mv | AT apyanaram searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT barbieririchardalexander searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT buszawit searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT caliivanamos searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT dimatteoleonardo searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT gomezceballosguillelmo searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT goncharovmaxim searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT gulhandogacan searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT klutemarkus searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT laiyueshi searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT leeyenjie searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT levinandrewmichael searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT pauschristophme searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT ralphduncankelley searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT stephansgeorgesf searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT velicanudragosalexandru searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT veverkajan searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT wyslouchboleslaw searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT yangmingming searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT zanettimarco searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT chanm searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT luckeyjrpdavid searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT rolandchristofe searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT rolandguntherm searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT sumorokkonstantyc searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev AT wyslouchvictoria searchfordecaysofstoppedlonglivedparticlesproducedinprotonprotoncollisionsats8tev |