Search for stopped long-lived particles produced in pp collisions at √ s =7  TeV.

Greg P Heath; Francis J D Bostock; Jim J Brooke; Emyr J Clement; David G Cussans; Henning U Flaecher; Robert J E Frazier; Joel Goldstein; Mark A Grimes; Helen F Heath; Lukasz Kreczko; Simon Metson; David M Newbold; Kachanon Nirunpong; Tony Poll; Sergey Senkin; Vincent J Smith; Tom S Williams; al.) CMS Collaboration (Chatrchyan, S, et

doi:10.1007/JHEP08(2012)026

Search for stopped long-lived particles produced in pp collisions at √ s =7 TeV.

Greg P Heath, Francis J D Bostock, Jim J Brooke, Emyr J Clement, David G Cussans, Henning U Flaecher, Robert J E Frazier, Joel Goldstein, Mark A Grimes, Helen F Heath, Lukasz Kreczko, Simon Metson, David M Newbold, Kachanon Nirunpong, Tony Poll, Sergey Senkin, Vincent J Smith, Tom S Williams, al.) CMS Collaboration (Chatrchyan, S, et

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Abstract

A search has been performed for long-lived particles that have stopped in the CMS detector, during 7 TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no proton-proton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 inverse femtobarns, and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean background prediction of 8.6+/-2.4 events. Limits are presented at 95% confidence level on long-lived gluino and stop production, over 13 orders of magnitude of particle lifetime. Assuming the 'cloud model' of R-hadron interactions, a gluino with mass below 640 GeV and a stop with mass below 340 GeV are excluded, for lifetimes between 10 microseconds and 1000 seconds.

Original language	English
Article number	26
Pages (from-to)	026
Number of pages	32
Journal	Journal of High Energy Physics
Volume	2012
Issue number	8
DOIs	https://doi.org/10.1007/JHEP08(2012)026
Publication status	Published - Aug 2012

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1 Membership of external research organisation
1 - Research and Teaching at External Organisation

CMS project at CERN LHC
Helen F Heath (Contributor)
1995 → …
Activity: Other activity types › - Research and Teaching at External Organisation
European Organization for Nuclear Research (External organisation)
Joel Goldstein (Participant)
1993 → …
Activity: Membership types › Membership of external research organisation

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Heath, G. P., Bostock, F. J. D., Brooke, J. J., Clement, E. J., Cussans, D. G., Flaecher, H. U., Frazier, R. J. E., Goldstein, J., Grimes, M. A., Heath, H. F., Kreczko, L., Metson, S., Newbold, D. M., Nirunpong, K., Poll, T., Senkin, S., Smith, V. J., Williams, T. S., & CMS Collaboration (Chatrchyan, S, et, A. . (2012). Search for stopped long-lived particles produced in pp collisions at √ s =7 TeV. Journal of High Energy Physics, 2012(8), 026. [26]. https://doi.org/10.1007/JHEP08(2012)026

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title = "Search for stopped long-lived particles produced in pp collisions at √ s =7 TeV.",

abstract = "A search has been performed for long-lived particles that have stopped in the CMS detector, during 7 TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no proton-proton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 inverse femtobarns, and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean background prediction of 8.6+/-2.4 events. Limits are presented at 95% confidence level on long-lived gluino and stop production, over 13 orders of magnitude of particle lifetime. Assuming the 'cloud model' of R-hadron interactions, a gluino with mass below 640 GeV and a stop with mass below 340 GeV are excluded, for lifetimes between 10 microseconds and 1000 seconds. ",

author = "Heath, {Greg P} and Bostock, {Francis J D} and Brooke, {Jim J} and Clement, {Emyr J} and Cussans, {David G} and Flaecher, {Henning U} and Frazier, {Robert J E} and Joel Goldstein and Grimes, {Mark A} and Heath, {Helen F} and Lukasz Kreczko and Simon Metson and Newbold, {David M} and Kachanon Nirunpong and Tony Poll and Sergey Senkin and Smith, {Vincent J} and Williams, {Tom S} and {CMS Collaboration (Chatrchyan, S, et}, al.)",

year = "2012",

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doi = "10.1007/JHEP08(2012)026",

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Heath, GP, Bostock, FJD, Brooke, JJ , Clement, EJ , Cussans, DG , Flaecher, HU, Frazier, RJE, Goldstein, J, Grimes, MA, Heath, HF , Kreczko, L, Metson, S, Newbold, DM, Nirunpong, K, Poll, T, Senkin, S, Smith, VJ, Williams, TS & CMS Collaboration (Chatrchyan, S, et, A 2012, 'Search for stopped long-lived particles produced in pp collisions at √ s =7 TeV.', Journal of High Energy Physics, vol. 2012, no. 8, 26, pp. 026. https://doi.org/10.1007/JHEP08(2012)026

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T1 - Search for stopped long-lived particles produced in pp collisions at √ s =7 TeV.

AU - Heath, Greg P

AU - Bostock, Francis J D

AU - Brooke, Jim J

AU - Clement, Emyr J

AU - Cussans, David G

AU - Flaecher, Henning U

AU - Frazier, Robert J E

AU - Goldstein, Joel

AU - Grimes, Mark A

AU - Heath, Helen F

AU - Kreczko, Lukasz

AU - Metson, Simon

AU - Newbold, David M

AU - Nirunpong, Kachanon

AU - Poll, Tony

AU - Senkin, Sergey

AU - Smith, Vincent J

AU - Williams, Tom S

AU - CMS Collaboration (Chatrchyan, S, et, al.)

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N2 - A search has been performed for long-lived particles that have stopped in the CMS detector, during 7 TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no proton-proton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 inverse femtobarns, and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean background prediction of 8.6+/-2.4 events. Limits are presented at 95% confidence level on long-lived gluino and stop production, over 13 orders of magnitude of particle lifetime. Assuming the 'cloud model' of R-hadron interactions, a gluino with mass below 640 GeV and a stop with mass below 340 GeV are excluded, for lifetimes between 10 microseconds and 1000 seconds.

AB - A search has been performed for long-lived particles that have stopped in the CMS detector, during 7 TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no proton-proton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 inverse femtobarns, and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean background prediction of 8.6+/-2.4 events. Limits are presented at 95% confidence level on long-lived gluino and stop production, over 13 orders of magnitude of particle lifetime. Assuming the 'cloud model' of R-hadron interactions, a gluino with mass below 640 GeV and a stop with mass below 340 GeV are excluded, for lifetimes between 10 microseconds and 1000 seconds.

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DO - 10.1007/JHEP08(2012)026

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SP - 026

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 8

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ER -

Search for stopped long-lived particles produced in pp collisions at √ s =7 TeV.

Abstract

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CMS project at CERN LHC

European Organization for Nuclear Research (External organisation)

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