Pseudorapidity (η) distributions of charged particles produced in proton-proton collisions at a centre-of-mass energy of 8 TeV are measured in the ranges abs(η) < 2.2 and 5.3 < abs(η) < 6.4 covered by the CMS and TOTEM detectors, respectively. The data correspond to an integrated luminosity of 45 inverse microbarns. Measurements are presented for three event categories. The most inclusive category is sensitive to 91-96% of the total inelastic proton-proton cross section. The other two categories are disjoint subsets of the inclusive sample that are either enhanced or depleted in single diffractive dissociation events. The data are compared to models used to describe high-energy hadronic interactions. None of the models considered provide a consistent description of the measured distributions.

**Figure caption**: Charged-particle pseudorapidity distributions from an inclusive sample. The error bars represent the statistical + uncorrelated systematics between neighbouring bins and the bands show the combined systematic and statistical uncertainties. The measurements are compared to results from PYTHIA6, tune Z2*, PYTHIA8, tune 4C, HERWIGpp, tune UE-EE-3 with CTEQ6L1 PDFs, EPOS, tune LHC, and QGS-04.

**Figure caption**: Charged-particle pseudorapidity distributions from a NSD-enhanced sample. The error bars represent the statistical + uncorrelated systematics between neighbouring bins and the bands show the combined systematic and statistical uncertainties. The measurements are compared to results from PYTHIA6, tune Z2*, PYTHIA8, tune 4C, HERWIGpp, tune UE-EE-3 with CTEQ6L1 PDFs, EPOS, tune LHC, and QGS-04.

**Figure caption**: Charged-particle pseudorapidity distributions from a SD-enhanced sample (bottom). The error bars represent the statistical + uncorrelated systematics between neighbouring bins and the bands show the combined systematic and statistical uncertainties. The measurements are compared to results from PYTHIA6, tune Z2*, PYTHIA8, tune 4C, HERWIGpp, tune UE-EE-3 with CTEQ6L1 PDFs, EPOS, tune LHC, and QGS-04.

**Figure caption**: Value of dNch/dη at η≈0 as a function of the centre-of-mass energy in p-p and p-pbar collisions. Shown are measurements performed with different NSD event selections from UA1, UA5, CDF, ALICE, and CMS. The dashed line is a power-law fit to the data.

I | Attachment | History | Action | Size | Date | Who | Comment |
---|---|---|---|---|---|---|---|

png | Double10Feb_FINAL.png | r1 | manage | 49.2 K | 2014-07-09 - 16:38 | JonathanHollar | |

png | Inclusive10Feb_FINAL.png | r1 | manage | 47.2 K | 2014-07-09 - 16:38 | JonathanHollar | |

png | Single10Feb_FINAL.png | r1 | manage | 41.0 K | 2014-07-09 - 16:38 | JonathanHollar | |

png | cms_double.png | r1 | manage | 23.2 K | 2013-04-22 - 23:05 | PanagiotisKatsas | |

png | cms_inclusive.png | r1 | manage | 23.1 K | 2013-04-22 - 22:37 | PanagiotisKatsas | |

png | combined_double.png | r2 r1 | manage | 29.1 K | 2013-04-23 - 09:44 | PanagiotisKatsas | |

png | combined_inclusive.png | r2 r1 | manage | 26.6 K | 2013-04-23 - 09:44 | PanagiotisKatsas | |

png | pt1000_inclusive.png | r1 | manage | 48.4 K | 2013-04-22 - 15:59 | PanagiotisKatsas | pseudorapidity distributions |

png | pt1000_nsd.png | r2 r1 | manage | 48.1 K | 2013-04-22 - 22:50 | PanagiotisKatsas | |

png | pt100_inclusive.png | r1 | manage | 48.3 K | 2013-04-22 - 15:59 | PanagiotisKatsas | pseudorapidity distributions |

png | pt100_nsd.png | r2 r1 | manage | 49.8 K | 2013-04-22 - 22:52 | PanagiotisKatsas | |

png | sqrts_vs_dndeta-data.png | r3 r2 r1 | manage | 28.1 K | 2013-04-23 - 00:24 | PanagiotisKatsas | |

png | sqrts_vs_dndeta-data_CWR.png | r1 | manage | 28.0 K | 2014-07-09 - 16:38 | JonathanHollar | |

png | track_pt_integrated_corrected_08.png | r1 | manage | 41.2 K | 2013-04-22 - 15:44 | PanagiotisKatsas | leading track pt distributions |

png | track_pt_integrated_corrected_08_mc.png | r1 | manage | 39.8 K | 2013-04-22 - 15:44 | PanagiotisKatsas | leading track pt distributions |

png | track_pt_leading_08.png | r1 | manage | 47.3 K | 2013-04-22 - 15:44 | PanagiotisKatsas | leading track pt distributions |

png | track_pt_leading_08_mc.png | r1 | manage | 46.4 K | 2013-04-22 - 15:44 | PanagiotisKatsas | leading track pt distributions |

This topic: CMSPublic > WebPreferences > PhysicsResultsFSQ12026

Topic revision: r4 - 2014-07-09 - JonathanHollar

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