Published March 2015 | Version v1
Journal article

Measurement of the forward charged particle pseudorapidity density in pp collisions at √(s) = 8 TeV using a displaced interaction point

  • 1. Bulgarian Academy of Sciences, INRNE-BAS, Institute for Nuclear Research and Nuclear Energy, Sofia (Bulgaria)
  • 2. CERN, Geneva (Switzerland)
  • 3. Dipartimento Interateneo di Fisica di Bari, Bari (Italy)
  • 4. INFN Sezione di Bari, Bari (Italy)
  • 5. Gruppo Collegato INFN di Siena, Siena (Italy)
  • 6. Universita degli Studi di Siena (Italy)
  • 7. Universita degli Studi di Genova, Genoa (Italy)
  • 8. INFN Sezione di Genova, Genoa (Italy)
  • 9. University of Helsinki, Department of Physics, Helsinki (Finland)
  • 10. Helsinki Institute of Physics, Helsinki (Finland)
  • 11. Case Western Reserve University, Department of Physics, Cleveland, OH (United States)
  • 12. Eoetvoes University, Department of Atomic Physics, Budapest (Hungary)
  • 13. MTA Wigner Research Center, RMKI, Budapest (Hungary)
  • 14. Czech Technical University, Prague (Czech Republic)
  • 15. Ioffe Physical-Technical Institute of Russian Academy of Sciences, St. Petersburg (Russian Federation)
  • 16. Warsaw University of Technology, Warsaw (Poland)
  • 17. University of West Bohemia, Plzen (Czech Republic)
  • 18. Polish Academy of Science, Institute of Nuclear Physics, Krakow (Poland)
  • 19. AGH University of Science and Technology, Krakow (Poland)
  • 20. Institute of Physics of the Academy of Sciences of the Czech Republic, Prague (Czech Republic)
  • 21. INFN Sezione di Pisa, Pisa (Italy)
  • 22. National Institute of Chemical Physics and Biophysics NICPB, Tallinn (Estonia)
  • 23. Gruppo Collegato INFN di Siena, Siena (IT)
  • 24. Universita degli Studi di Siena (IT)
  • 25. Universita degli Studi di Genova, Genoa (IT)
  • 26. INFN Sezione di Genova, Genoa (IT)
  • 27. CERN, Geneva (CH)
  • 28. Helsinki Institute of Physics, Helsinki (FI)
  • 29. INFN Sezione di Bari, Bari (IT)
  • 30. Dipartimento Interateneo di Fisica di Bari, Bari (IT)
  • 31. Eoetvoes University, Department of Atomic Physics, Budapest (HU)
  • 32. MTA Wigner Research Center, RMKI, Budapest (HU)
  • 33. University of Helsinki, Department of Physics, Helsinki (FI)
  • 34. SLAC National Accelerator Laboratory, Stanford, CA (US)
  • 35. University of West Bohemia, Plzen (CZ)
  • 36. Institute of Physics of the Academy of Sciences of the Czech Republic, Prague (CZ)
  • 37. Case Western Reserve University, Department of Physics, Cleveland, OH (US)
  • 38. Czech Technical University, Prague (CZ)
  • 39. Penn State University, Department of Physics, University Park, PA (US)
  • 40. AGH University of Science and Technology, Krakow (PL)

Description

The pseudorapidity density of charged particles dNch/dη is measured by the TOTEM experiment in proton-proton collisions at √(s) = 8 TeV within the range 3.9 < η < 4.7 and -6.95 < η < -6.9. Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25 m from the nominal interaction point. The data sample is expected to include 96-97 % of the inelastic proton-proton interactions. The measurement reported here considers charged particles with pT > 0 MeV/c, produced in inelastic interactions with at least one charged particle in -7 < η < -6 or 3.7 < η < 4.8. The dNch/dη has been found to decrease with vertical stroke η vertical stroke, from 5.11 ± 0.73 at η = 3.95 to 1.81 ± 0.56 at η = -6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement. (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epjc/s10052-015-3343-7

Additional details

Publishing Information

Journal Title
European physical journal. C, Particles and fields (Internet)
Journal Volume
75
Journal Issue
3
Journal Page Range
p. 1-9
ISSN
1434-6052

Optional Information

Collaborations
TOTEM Collaboration