| Article | |
| Report number | arXiv:1503.03505 ; CERN-PH-EP-DRAFT-LHCF-2015-001 ; CERN-PH-EP-2015-056 |
| Title | Measurement of very forward neutron energy spectra for 7 TeV proton--proton collisions at the Large Hadron Collider |
| Author(s) |
Adriani, O. (INFN, Florence ; Florence U.) ; Berti, E. (INFN, Florence ; Florence U.) ; Bonechi, L. (INFN, Florence) ; Bongi, M. (INFN, Florence ; Florence U.) ; Castellini, G. (INFN, Florence ; IFAC, Florence) ; D'Alessandro, R. (INFN, Florence ; Florence U.) ; Del Prete, M. (INFN, Florence ; Florence U.) ; Haguenauer, M. (Ec. Polytech., Palaiseau (main)) ; Itow, Y. (Nagoya U., Solar-Terrestrial Environ. Lab. ; KMI, Nagoya) ; Kasahara, K. (Waseda U., RISE) ; Kawade, K. (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Makino, Y. (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Masuda, K. (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Matsubayashi, E. (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Menjo, H. (Nagoya U.) ; Mitsuka, G. (Florence U.) ; Muraki, Y. (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Okuno, Y. (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Papini, P. (INFN, Florence) ; Perrot, A-L. (CERN) ; Ricciarini, S. (INFN, Florence ; IFAC, Florence) ; Sako, T. (Nagoya U., Solar-Terrestrial Environ. Lab. ; KMI, Nagoya) ; Sakurai, N. (KMI, Nagoya) ; Sugiura, Y. (Nagoya U., Solar-Terrestrial Environ. Lab.) ; Suzuki, T. (Waseda U., RISE) ; Tamura, T. (Kanagawa U.) ; Tiberio, A. (INFN, Florence ; Florence U.) ; Torii, S. (Waseda U., RISE) ; Tricomi, A. (Catania U. ; INFN, Catania) ; Turner, W.C. (LBNL, Berkeley) ; Zhou, Q.D. (Nagoya U., Solar-Terrestrial Environ. Lab.) |
| Publication | 2015-09-19 |
| Imprint | 11 Mar 2015 |
| Number of pages | 7 |
| Note | 10pages, 6 figures |
| In: | Phys. Lett. B 750 (2015) 360-366 |
| DOI | 10.1016/j.physletb.2015.09.041 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; LHCf |
| Free keywords | QCD ; forward physics ; particle and resonance production ; minimum bias ; experimental results ; forward neutron production ; hadronic-interaction model |
| Abstract | The Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC $\sqrt{s}$ = 7 TeV proton--proton collisions with the pseudo-rapidity $\eta$ ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity. The measured energy spectra obtained from the two independent calorimeters of Arm1 and Arm2 show the same characteristic feature before unfolding the difference in the detector responses. We unfolded the measured spectra by using the multidimensional unfolding method based on Bayesian theory, and the unfolded spectra were compared with current hadronic-interaction models. The QGSJET II-03 model predicts a high neutron production rate at the highest pseudo-rapidity range similar to our results and the DPMJET 3.04 model describes our results well at the lower pseudo-rapidity ranges. However no model perfectly explains the experimental results in the whole pseudo-rapidity range. The experimental data indicate the most abundant neutron production rate relative to the photon production, which does not agree with predictions of the models. |
| Copyright/License | preprint: © 2015-2026 CERN (License: CC-BY-4.0) publication: © 2015-2026 CERN (License: CC-BY-4.0), sponsored by SCOAP³ |
Corresponding record in: Inspire
Email contact: takashi.sako@cern.ch
记录创建於2015-03-13，最後更新在2022-08-10
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