☆ 4.7 Article

Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s=7 TeV

PHYSICS LETTERS B (2012)

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Journal

PHYSICS LETTERS B
Volume 715, Issue 1-3, Pages 44-60

Publisher

ELSEVIER
DOI: 10.1016/j.physletb.2012.07.010

Keywords

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Categories

Astronomy & Astrophysics Physics, Nuclear Physics, Particles & Fields

Funding

  1. ANPCyT, Argentina
  2. YerPhI, Armenia
  3. ARC, Australia
  4. BMWF, Austria
  5. ANAS, Azerbaijan
  6. SSTC, Belarus
  7. CNPq, Brazil
  8. FAPESP, Brazil
  9. NSERC, Canada
  10. NRC, Canada
  11. CFI, Canada
  12. CERN
  13. CONICYT, Chile
  14. CAS, China
  15. MOST, China
  16. NSFC, China
  17. COLCIENCIAS, Colombia
  18. MSMT CR, Czech Republic
  19. MPO CR, Czech Republic
  20. VSC CR, Czech Republic
  21. DNRF, Denmark
  22. DNSRC, Denmark
  23. Lundbeck Foundation, Denmark
  24. ARTEMIS
  25. European Union
  26. IN2P3-CNRS, France
  27. CEA-DSM/IRFU, France
  28. GNAS, Georgia
  29. BMBF, Germany
  30. DFG, Germany
  31. HGF, Germany
  32. MPG, Germany
  33. AvH Foundation, Germany
  34. GSRT, Greece
  35. ISF, Israel
  36. MINERVA, Israel
  37. GIF, Israel
  38. DIP, Israel
  39. Benoziyo Center, Israel
  40. INFN, Italy
  41. MEXT, Japan
  42. JSPS, Japan
  43. CNRST, Morocco
  44. FOM, Netherlands
  45. NWO, Netherlands
  46. RCN, Norway
  47. MNiSW, Poland
  48. GRICES, Portugal
  49. FCT, Portugal
  50. MERYS (MECTS), Romania
  51. MES of Russia, Russian Federation
  52. ROSATOM, Russian Federation
  53. JINR
  54. MSTD, Serbia
  55. MSSR, Slovakia
  56. ARRS, Slovenia
  57. MVZT, Slovenia
  58. DST/NRF, South Africa
  59. MICINN, Spain
  60. SRC, Sweden
  61. Wallenberg Foundation, Sweden
  62. SER, Canton of Bern Switzerland
  63. SNSF, Canton of Geneva Switzerland
  64. NSC, Taiwan
  65. TAEK, Turkey
  66. STFC, United Kingdom
  67. Royal Society, United Kingdom
  68. DOE, United States
  69. NSF, United States
  70. Leverhulme Trust, United Kingdom
  71. STFC [ST/H001042/1, ST/M001512/1, PP/E003699/1, ST/H001026/2, ST/K001337/1, PP/E000347/1, ST/H00100X/2, ST/I003517/1, ST/L001144/1, ST/H00100X/1, ST/I005811/1, PP/E000355/1, ST/J004928/1, ST/G502320/1, ST/I006080/1, ST/L001195/1, ST/H001093/1, ST/K501840/1, ST/H001026/1, ST/I003142/1, ST/M000753/1, PP/E002757/1, ST/K000705/1, ST/K00140X/1, ST/F007337/1, ST/H001042/2, ST/J004944/1, PP/E003699/2, ST/M000761/1, ST/J005576/1, ST/H001069/2, ST/G006717/1, ST/K001361/1, ST/I003525/1, ST/I005803/1, ST/J005460/1, PP/E003087/1, ST/I000186/1, ST/J002798/1, ST/K001329/1, ST/M001431/1, ST/H001093/2, ST/K001248/1, ST/K00073X/1] Funding Source: UKRI
  72. ICREA Funding Source: Custom
  73. Science and Technology Facilities Council [ST/I005811/1, PP/E000347/1, ST/K001361/1 LHCb Upgrades, ST/H001042/1, ST/H001042/2, ST/H001093/1, ST/K001361/1, ST/K501840/1, ST/K001337/1, ST/K001264/1 ATLAS, ST/I005803/1 GRIDPP, ST/M000761/1, ST/K001248/1, ST/K001361/1 ATLAS, ST/K00140X/1 ATLAS, ST/L001195/1, ST/I003525/1, PP/E002757/1, ST/I003142/1, ST/M001474/1, ST/I005803/1, ST/H001026/2, ST/K001310/1 ATLAS, ST/K001361/1 MINOS/MINOS+, ST/H001069/2, ST/H001026/1, ST/M001512/1, ST/M001431/1, PP/E003699/1, ST/G502320/1, ST/K501840/1 GRIDPP, ST/H001093/2, ST/J004944/1, ST/K001418/1, ATLAS, ST/K00140X/1, ST/K001310/1 LHCb, ST/J004928/1 ATLAS Upgrade, ST/K001361/1 LHCb, ST/H00100X/1, ST/J002798/1, ST/K001248/1 ATLAS, PP/E000355/1, ST/K001361/1 ATLAS Upgrades, ST/K000705/1, ST/J005576/1, ST/K001310/1 LHCb Upgrades, ST/I000186/1, ST/K001337/1 ATLAS, ST/I006080/1, ST/J004928/1, PP/E003087/1, ST/I003517/1, ST/H00100X/2, ST/L001144/1, ST/K001310/1, ST/G006717/1, PP/E003699/2, GRIDPP, ST/J005460/1, ST/K00073X/1, ST/K001310/1 ATLAS Upgrades, ST/F007337/1, ST/K00140X/1 LHCb] Funding Source: researchfish
  74. Division Of Physics
  75. Direct For Mathematical & Physical Scien [1119200] Funding Source: National Science Foundation

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The results of a search for pair production of the lighter scalar partners of top quarks ((t) over bar (1)) in 2.05 fb(-1) of pp collisions at root s = 7 TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (e, mu) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking 'natural' scenarios, where the neutralino ((chi) over bar (0)(1)) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for 115 GeV m(<(chi) over bar1)(0) 230 GeV at 95% confidence level, reaching an exclusion of m(<(t) over bar1) 330 GeV for m(<(chi) over bar1)(0) = 190 GeV. Scalar top quark masses below 240 GeV are excluded for all values of m((chi) over bar1)(0) > m(z). (c) 2012 CERN. Published by Elsevier B.V. All rights reserved.

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