Abstract
The inclusive production rate of neutral pions in the rapidity range greater than y=8.9 has been measured by the Large Hadron Collider forward (LHCf) experiment during s=7 TeV proton-proton collision operation in early 2010. This paper presents the transverse momentum spectra of the neutral pions. The spectra from two independent LHCf detectors are consistent with each other and serve as a cross-check of the data. The transverse momentum spectra are also compared with the predictions of several hadronic interaction models that are often used for high-energy particle physics and for modeling ultrahigh-energy cosmic ray showers.3 MoreReceived 21 May 2012DOI:https://doi.org/10.1103/PhysRevD.86.092001This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.© 2012 CERN, for the LHCf Collaboration
Highlights
One of the important tasks of strong-interaction physics described by quantum chromodynamics (QCD) is to provide a detailed understanding of forward particle production in hadronic interactions
Deep inelastic scattering that is accompanied by the exchange of virtual photons or vector bosons, or jets produced by large transverse momentum partons are typical phenomena that are categorized as hard processes
The pT spectra derived from the independent analyses of the Arm1 and Arm2 detectors are presented in Fig. 6 for six ranges of rapidity y: 8.9 to 9.0, 9.0 to 9.2, 9.2 to 9.4, 9.4 to 9.6, 9.6 to 10.0, and 10.0 to 11.0
Summary
One of the important tasks of strong-interaction physics described by quantum chromodynamics (QCD) is to provide a detailed understanding of forward particle production in hadronic interactions. QCD involves two types of limiting processes: ‘‘hard’’ and ‘‘soft.’’. Hard processes occur in the range characterized by a large four-momentum transfer t, where jtj should be larger than 1 GeV2. Note that units used in this report are c 1⁄4 kðBoltzmann constantÞ 1⁄4 1. Deep inelastic scattering that is accompanied by the exchange of virtual photons or vector bosons, or jets produced by large transverse momentum (pT) partons are typical phenomena that are categorized as hard processes. The hard processes have been successfully described by perturbation theory, owing to the asymptotic freedom of QCD at high energy
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