doi:10.1103/PhysRevD.94.032007engAdriani, O.Berti, E.Bonechi, L.Bongi, M.D'Alessandro, R.Del Prete, M.Haguenauer, M.Itow, Y.Iwata, T.Kasahara, K.Kawade, K.Makino, Y.Masuda, K.Matsubayashi, E.Menjo, H.Mitsuka, G.Muraki, Y.Papini, P.Perrot, A.L.Ricciarini, S.Sako, T.Sakurai, N.Suzuki, T.Tamura, T.Tiberio, A.Torii, S.Tricomi, A.Turner, W.C.Ueno, M.Zhou, Q.D.Measurements of longitudinal and transverse momentum distributions for neutral pions in the forward-rapidity region with the LHCf detectorParticle Physics - ExperimentarXiv:1507.08764CERN-PH-EP-2015-201CERN-PH-EP-2015-201The transverse and longitudinal momentum distributions for inclusive neutral pions in the very forward rapidity region have been measured with the Large Hadron Collider forward detector in proton-proton collisions at $\sqrt{s}=$ 2.76 and 7 TeV and in proton-lead collisions at nucleon-nucleon center-of-mass energies of $\sqrt{s_\text{NN}}=$ 5.02 TeV at the LHC. Such momentum distributions in proton-proton collisions are compatible with the hypotheses of limiting fragmentation and Feynman scaling. A sizable suppression of the production of neutral pions, after taking into account ultraperipheral collisions, is found in the transverse and longitudinal momentum distributions obtained in proton-lead collisions. This leads to a strong nuclear modification factor value of about 0.1-0.3. The experimental measurements presented in this paper provide a benchmark for the hadronic interaction Monte Carlo simulations codes that are used for the simulation of air showers.The differential cross sections for inclusive neutral pions as a function of transverse and longitudinal momentum in the very forward-rapidity region have been measured at the LHC with the LHC forward detector in proton-proton collisions at s=2.76 and 7 TeV and in proton-lead collisions at nucleon-nucleon center-of-mass energies of sNN=5.02  TeV. Such differential cross sections in proton-proton collisions are compatible with the hypotheses of limiting fragmentation and Feynman scaling. Comparing proton-proton with proton-lead collisions, we find a sizable suppression of the production of neutral pions in the differential cross sections after subtraction of ultraperipheral proton-lead collisions. This suppression corresponds to the nuclear modification factor value of about 0.1–0.3. The experimental measurements presented in this paper provide a benchmark for the hadronic interaction Monte Carlo simulation codes that are used for the simulation of cosmic ray air showers.The differential cross sections for inclusive neutral pions as a function of transverse and longitudinal momentum in the very forward rapidity region have been measured at the Large Hadron Collider (LHC) with the Large Hadron Collider forward detector (LHCf) in proton-proton collisions at $\sqrt{s}=$ 2.76 and 7 TeV and in proton-lead collisions at nucleon-nucleon center-of-mass energies of $\sqrt{s_\text{NN}}=$ 5.02 TeV. Such differential cross sections in proton-proton collisions are compatible with the hypotheses of limiting fragmentation and Feynman scaling. Comparing proton-proton with proton-lead collisions, we find a sizable suppression of the production of neutral pions in the differential cross sections after subtraction of ultra-peripheral proton-lead collisions. This suppression corresponds to the nuclear modification factor value of about 0.1-0.3. The experimental measurements presented in this paper provide a benchmark for the hadronic interaction Monte Carlo simulation codes that are used for the simulation of cosmic ray air showers.2015-07-31http://cds.cern.ch/record/203981310.1103/PhysRevD.94.032007http://cds.cern.ch/record/2039813oai:cds.cern.ch:203981347 pages, 23 figures, 59 tables, accepted in PRD