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Title: Search for pair-produced long-lived neutral particles decaying to jets in the ATLAS hadronic calorimeter in pp collisions at √ s=8 TeV

The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay of a scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in 20.3 fb-1 of data collected in proton–proton collisions at √s=8 TeV. This research is sensitive to long-lived particles that decay to Standard Model particles producing jets at the outer edge of the ATLAS electromagnetic calorimeter or inside the hadronic calorimeter. No significant excess of events is observed. Limits are reported on the product of the scalar boson production cross section times branching ratio into long-lived neutral particles as a function of the proper lifetime of the particles. Limits are reported for boson masses from 100 GeV to 900 GeV, and a long-lived neutral particle mass from 10 GeV to 150 GeV.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] ;  [15] ;  [16] ;  [17] ;  [18] ;  [19]
  1. Univ. of Aix-Marselle (France)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Academia Sinica, Taipei (Taiwan)
  4. Univ. of Paris-Sud, Orsay (France)
  5. Azerbaijan Academy of Sciences, Baku (Azerbaijan)
  6. Univ. of Amsterdam (Netherlands)
  7. Oklahoma State Univ., Stillwater, OK (United States)
  8. Michigan State Univ., East Lansing, MI (United States)
  9. Univ. of Toronto, ON (Canada)
  10. Tel Aviv Univ., Ramat Aviv (Israel)
  11. Technion-Israel Inst. of Tech., Haifa (Israel)
  12. CERN, Geneva (Switzerland)
  13. Stockholm Univ. (Sweden)
  14. Univ. of Udine (Italy)
  15. AGH Univ. of Science and Technology, Krakow (Poland)
  16. Brookhaven National Lab. (BNL), Upton, NY (United States)
  17. Northern Illinois Univ., DeKalb, IL (United States)
  18. Ludwig Maximilian Univ., Munich (Germany)
  19. Rutherford Appleton Lab, Didcot (United Kingdom). et al.
Publication Date:
OSTI Identifier:
1198584
Report Number(s):
BNL-108056-2015-JA
Journal ID: ISSN 0370-2693; KA1101021; TRN: US1600960
Grant/Contract Number:
SC00112704; AC02-06CH11357; AC03-76SF00515; AC02-05CH11231
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 743; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
ATLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; high-energy collider experiment; long-lived neutral particle; new physics