002001335 001__ 2001335
002001335 003__ SzGeCERN
002001335 005__ 20220810145726.0
002001335 0248_ $$aoai:cds.cern.ch:2001335$$pcerncds:CERN$$pcerncds:CERN:FULLTEXT$$pcerncds:FULLTEXT
002001335 0247_ $$2DOI$$a10.1016/j.physletb.2015.09.041
002001335 035__ $$9arXiv$$aoai:arXiv.org:1503.03505
002001335 035__ $$9Inspire$$a1351909
002001335 037__ $$9arXiv$$aarXiv:1503.03505$$chep-ex
002001335 037__ $$aCERN-PH-EP-DRAFT-LHCF-2015-001
002001335 037__ $$aCERN-PH-EP-2015-056
002001335 041__ $$aeng
002001335 084__ $$2CERN Library$$aPH-EP-2015-056
002001335 100__ $$aAdriani, O.$$uFlorence U.$$uINFN, Florence$$vINFN Section of Florence, Italy$$vUniversity of Florence, Italy
002001335 245__ $$aMeasurement of very forward neutron energy spectra for 7 TeV proton--proton collisions at the Large Hadron Collider
002001335 269__ $$aGeneva$$bCERN$$c11 Mar 2015
002001335 260__ $$c2015-09-19
002001335 300__ $$a7 p
002001335 506__ $$dtakashi.sako@cern.ch
002001335 506__ $$mtakashi.sako@cern.ch
002001335 506__ $$mcds-ph-ep-publications-referee [CERN]
002001335 500__ $$9arXiv$$a10pages, 6 figures
002001335 520__ $$aThe Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC $\sqrt{s}$ = 7 TeV proton--proton collisions with the pseudo-rapidity $\eta$ ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity. The measured energy spectra obtained from the two independent calorimeters of Arm1 and Arm2 show the same characteristic feature before unfolding the difference in the detector responses. We unfolded the measured spectra by using the multidimensional unfolding method based on Bayesian theory, and the unfolded spectra were compared with current hadronic-interaction models. The QGSJET II-03 model predicts a high neutron production rate at the highest pseudo-rapidity range similar to our results and the DPMJET 3.04 model describes our results well at the lower pseudo-rapidity ranges. However no model perfectly explains the experimental results in the whole pseudo-rapidity range. The experimental data indicate the most abundant neutron production rate relative to the photon production, which does not agree with predictions of the models.
002001335 520__ $$9HEPDATA$$hCERN-LHC. The Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC $\sqrt{s}$ = 7 TeV proton-proton collisions with the pseudo-rapidity $\eta$ ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity.
002001335 520__ $$9Elsevier$$aThe Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC $\sqrt{s}$=7 TeV proton–proton collisions with the pseudo-rapidity η ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity. The measured energy spectra obtained from the two independent calorimeters of Arm1 and Arm2 show the same characteristic feature before unfolding the detector responses. We unfolded the measured spectra by using the multidimensional unfolding method based on Bayesian theory, and the unfolded spectra were compared with current hadronic-interaction models. The QGSJET II-03 model predicts a high neutron production rate at the highest pseudo-rapidity range similar to our results, and the DPMJET 3.04 model describes our results well at the lower pseudo-rapidity ranges. However, no model perfectly explains the experimental results over the entire pseudo-rapidity range. The experimental data indicate a more abundant neutron production rate relative to the photon production than any model predictions studied here.
002001335 520__ $$9arXiv$$aThe Large Hadron Collider forward (LHCf) experiment is designed to use the LHC to verify the hadronic-interaction models used in cosmic-ray physics. Forward baryon production is one of the crucial points to understand the development of cosmic-ray showers. We report the neutron-energy spectra for LHC $\sqrt{s}$ = 7 TeV proton--proton collisions with the pseudo-rapidity $\eta$ ranging from 8.81 to 8.99, from 8.99 to 9.22, and from 10.76 to infinity. The measured energy spectra obtained from the two independent calorimeters of Arm1 and Arm2 show the same characteristic feature before unfolding the difference in the detector responses. We unfolded the measured spectra by using the multidimensional unfolding method based on Bayesian theory, and the unfolded spectra were compared with current hadronic-interaction models. The QGSJET II-03 model predicts a high neutron production rate at the highest pseudo-rapidity range similar to our results and the DPMJET 3.04 model describes our results well at the lower pseudo-rapidity ranges. However no model perfectly explains the experimental results in the whole pseudo-rapidity range. The experimental data indicate the most abundant neutron production rate relative to the photon production, which does not agree with predictions of the models.
002001335 540__ $$3preprint$$aCC-BY-4.0
002001335 540__ $$3publication$$aCC-BY-4.0$$fSCOAP3
002001335 542__ $$3preprint$$dCERN$$g2015
002001335 542__ $$3publication$$dCERN$$g2015
002001335 562__ $$cPublic comments
002001335 595__ $$aCERN EDS
002001335 595__ $$aLANL EDS
002001335 595__ $$aCERN-PH-EP
002001335 65017 $$2arXiv$$aParticle Physics - Experiment
002001335 65027 $$2arXiv$$aNuclear Physics - Experiment
002001335 6531_ $$9CERN$$aQCD
002001335 6531_ $$9CERN$$aforward physics
002001335 6531_ $$9CERN$$aparticle and resonance production
002001335 6531_ $$9CERN$$aminimum bias
002001335 6531_ $$9CERN$$aexperimental results
002001335 6531_ $$9CERN$$aforward neutron production
002001335 6531_ $$9CERN$$ahadronic-interaction model
002001335 693__ $$aCERN LHC$$eLHCf
002001335 695__ $$9LANL EDS$$ahep-ex
002001335 695__ $$9LANL EDS$$anucl-ex
002001335 690C_ $$aARTICLE
002001335 690C_ $$aCERN
002001335 690C_ $$aLHCf_Papers
002001335 700__ $$aBerti, E.$$uFlorence U.$$uINFN, Florence$$vUniversity of Florence, Italy$$vINFN Section of Florence, Italy
002001335 700__ $$aBonechi, L.$$uINFN, Florence$$vINFN Section of Florence, Italy
002001335 700__ $$aBongi, M.$$uFlorence U.$$uINFN, Florence$$vUniversity of Florence, Italy$$vINFN Section of Florence, Italy
002001335 700__ $$aCastellini, G.$$uIFAC, Florence$$uINFN, Florence$$vIFAC-CNR, Italy$$vINFN Section of Florence, Italy
002001335 700__ $$aD'Alessandro, R.$$uFlorence U.$$uINFN, Florence$$vUniversity of Florence, Italy$$vINFN Section of Florence, Italy
002001335 700__ $$aDel Prete, M.$$uFlorence U.$$uINFN, Florence$$vUniversity of Florence, Italy$$vINFN Section of Florence, Italy
002001335 700__ $$aHaguenauer, M.$$uEc. Polytech., Palaiseau (main)$$vEcole-Polytechnique, France
002001335 700__ $$aItow, Y.$$uKMI, Nagoya$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vKobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Japan$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aKasahara, K.$$uWaseda U., RISE$$vRISE, Waseda University, Japan
002001335 700__ $$aKawade, K.$$iINSPIRE-00419409$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aMakino, Y.$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aMasuda, K.$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aMatsubayashi, E.$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aMenjo, H.$$uNagoya U.$$vGraduate School of Science, Nagoya University, Japan
002001335 700__ $$aMitsuka, G.$$uFlorence U.$$vUniversity of Florence, Italy
002001335 700__ $$aMuraki, Y.$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aOkuno, Y.$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aPapini, P.$$uINFN, Florence$$vINFN Section of Florence, Italy
002001335 700__ $$aPerrot, A-L.$$uCERN$$vCERN, Switzerland
002001335 700__ $$aRicciarini, S.$$uIFAC, Florence$$uINFN, Florence$$vIFAC-CNR, Italy$$vINFN Section of Florence, Italy
002001335 700__ $$aSako, T.$$uKMI, Nagoya$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vKobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Japan$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aSakurai, N.$$uKMI, Nagoya$$vKobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Japan
002001335 700__ $$aSugiura, Y.$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 700__ $$aSuzuki, T.$$uWaseda U., RISE$$vRISE, Waseda University, Japan
002001335 700__ $$aTamura, T.$$uKanagawa U.$$vKanagawa University, Japan
002001335 700__ $$aTiberio, A.$$uFlorence U.$$uINFN, Florence$$vUniversity of Florence, Italy$$vINFN Section of Florence, Italy
002001335 700__ $$aTorii, S.$$uWaseda U., RISE$$vRISE, Waseda University, Japan
002001335 700__ $$aTricomi, A.$$uINFN, Catania$$uCatania U.$$vUniversity of Catania, Italy$$vINFN Section of Catania, Italy
002001335 700__ $$aTurner, W.C.$$uLBNL, Berkeley$$vLBNL, Berkeley, USA
002001335 700__ $$aZhou, Q.D.$$uNagoya U., Solar-Terrestrial Environ. Lab.$$vSolar-Terrestrial Environment Laboratory, Nagoya University, Japan
002001335 710__ $$5PH-EP
002001335 710__ $$gLHCf Collaboration
002001335 773__ $$c360-366$$pPhys. Lett. B$$v750$$y2015
002001335 859__ $$ftakashi.sako@cern.ch
002001335 8564_ $$uhttps://rivet.hepforge.org/analyses/LHCF_2015_I1351909$$yRivet analyses reference
002001335 8564_ $$81063119$$s150650$$uhttps://cds.cern.ch/record/2001335/files/arXiv:1503.03505.pdf
002001335 8564_ $$81063115$$s23606$$uhttps://cds.cern.ch/record/2001335/files/arm1modelcomp20150125.png$$y00002 Measured Arm1 energy spectra of neutron-like events together with MC predictions. Left panel shows the results for the small tower, and the center and right panels show the results for the large tower. The vertical bars represent the statistical (they are very small) and systematic uncertainties except the energy scale and luminosity uncertainties. Colored lines indicate MC predictions by EPOS 1.99 (magenta), QGSJET II-03 (blue), SYBILL 2.1 (green), DPMJET 3.04 (red), and PYTHIA 8.145 (yellow).
002001335 8564_ $$81063116$$s23253$$uhttps://cds.cern.ch/record/2001335/files/unfA1A2comp8.png$$y00004 Unfolded energy spectra of the small towers ($\eta>10.76$) and the large towers ($8.99 < \eta<9.22$ and $8.81<\eta<8.99$). The hatched areas show the Arm1 systematic errors, and the bars represent the Arm2 systematic errors except the luminosity uncertainty..
002001335 8564_ $$81063117$$s28074$$uhttps://cds.cern.ch/record/2001335/files/Unfoldedspectra14.png$$y00005 Comparison of the LHCf results with model predictions at small tower ($\eta>10.76$) and large towers ($8.99 < \eta<9.22$ and $8.81<\eta<8.99$). The black markers and gray hatched areas show the combined results of the LHCf Arm1 and Arm2 detectors and the systematic errors, respectively.
002001335 8564_ $$81063118$$s42813$$uhttps://cds.cern.ch/record/2001335/files/UnfoldDemoRatio6.png$$y00003 Comparison of unfolded spectra with true spectra for DPMJET 3.04 and EPOS 1.99 models at the small tower of Arm1. Bottom panel shows the ratio of the unfolded spectra to the true spectra.
002001335 8564_ $$81063120$$s22280$$uhttps://cds.cern.ch/record/2001335/files/A1A2comp8.png$$y00001 Energy spectra of neutron-like events measured by the Arm1 and Arm2 detectors. The left panel shows the results from the small towers, and the center and right panels show the results for the large towers. The horizontal axes represent the reconstructed energy. The vertical bars represent the statistical (they are negligibly small) and systematic uncertainties except the energy scale and the luminosity uncertainties.
002001335 8564_ $$81063121$$s34297$$uhttps://cds.cern.ch/record/2001335/files/L2D_4.png$$y00000 The L$_{{\rm 2D}}$ parameter distribution for the experimental data and the MC simulations from the template MC. The closed circles represent the Arm1 experimental results, whereas the red and blue histograms correspond to photon and neutron predictions. The open circles is the scaled results of the MC simulation obtained by method A.
002001335 8564_ $$81161146$$s543989$$uhttps://cds.cern.ch/record/2001335/files/scoap3-fulltext.pdf$$yArticle from SCOAP3
002001335 9031_ $$aApproval requested for number CERN-PH-EP-2015-056$$bCERN-PH-EP-2015-056$$cEPPHAPP$$d2015-03-03 02:45:37$$e2015-03-10 02:45:37$$ftakashi.sako@cern.ch$$swaiting
002001335 9031_ $$aDocument approved$$bCERN-PH-EP-2015-056$$cEPPHAPP$$d2015-03-09 16:33:05$$froger.forty@cern.ch$$sapproved
002001335 916__ $$sn$$w201510
002001335 960__ $$a13
002001335 981__ $$a1995528
002001335 980__ $$aLHCf_Papers
002001335 980__ $$aARTICLE
002001335 980__ $$aCERN