Measurement of zero degree single photon energy spectra for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7</mml:mn><mml:mtext> TeV</mml:mtext></mml:math> proton–proton collisions at LHC

Adriani, O.; Bonechi, L.; Bongi, M.; Castellini, G.; D’Alessandro, R.; Faus, A.; Fukatsu, K.; Haguenauer, M.; Itow, Y.; Kasahara, K.; Kawade, K.; Macina, D.; Mase, T.; Masuda, K.; Matsubara, Y.; Menjo, H.; Mitsuka, G.; Muraki, Y.; Nakai, M.; Noda, K.; Papini, P.; Perrot, A. L.; Ricciarini, S.; Sako, T.; Shimizu, Yuki; Suzuki, K.; Suzuki, T.; Taki, K.; Tamura, T.; Torii, Shoji; Tricomi, A.; Turner, W. C.; Velasco, J.; Viciani, A.; Yoshida, Kenji

doi:10.1016/j.physletb.2011.07.077

Cited by 85 publications

(63 citation statements)

References 19 publications

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“…The operation has been successfully done and have taken more than 200 M shower events in total. The energy spectrum of photons and the transverse momentum spectra of π 0 s were already published [9,10]. Figure 2 shows the transverse momentum spectrum of π 0 s measured by LHCf (black dots) with predictions of several hadronic interaction models (colored lines) [11][12][13][14][15].…”

Section: Results At P-p Collisions √ S = 7 Tevmentioning

confidence: 95%

Recent Results from the LHCf Experiment

Menjo

Adriani

Berti

et al. 2017

Proceedings of the 7th International Workshop on Very High Energy Particle Astronomy in 2014 (VHEPA2014)

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The LHCf experiment is an unique dedicated experiment for measurement of very forward particle production relevant to cosmic-ray air shower developments. The LHCf measured the spectra for forward photons, neutral pions and neutrons at √ s = 7 TeV p-p collisions and the nuclear modification factor for forward neutral pions at √ s = 5 TeV p-Pb. No hadronic interaction models used in air shower developments of very high energy cosmic-rays is able to reproduce all LHCf data reasonably while some of models are able to reproduce LHCf data partially.

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Section: Results At P-p Collisions √ S = 7 Tevmentioning

confidence: 95%

Recent Results from the LHCf Experiment

Menjo

Adriani

Berti

et al. 2017

Proceedings of the 7th International Workshop on Very High Energy Particle Astronomy in 2014 (VHEPA2014)

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“…At the end of the last run p -p interactions at √ s = 2.76 TeV were also produced for a short time. The already published results for the p -p runs are collected in references [6][7][8]. The main results for the higher energy run are the measurements of the single γ -ray energy spectrum in two different pseudo -rapidity ranges and the study of the transverse momentum spectra of the π 0 component.…”

Section: Published Resultsmentioning

confidence: 99%

“…LHCf begun its data taking in 2009 for p -p interactions at √ s =900 GeV and √ s =7 TeV. Interesting results for single γ -ray and π 0 have been already published [6][7][8] and a study of the neutron component is at an advanced stage for publication. In 2013 one of the two detectors has taken data also during the p -Pb run at √ s NN = 5.02 TeV.…”

Section: Discussionmentioning

confidence: 99%

“…The method for the measurement of the impact points and for the calibration of the energy measurement are described in [6]. Only single particle events have been selected for this preliminary analysis and only statistical uncertainties are considered in the plots.…”

Section: The Electromagnetic Component: Photonsmentioning

confidence: 99%

“…This was taken into account by correcting the energy reconstruction routines accordingly. Further details about the methods used for the analysis are described in [6]. In figure 3 the distribution of photon impact points is shown.…”

Section: The Electromagnetic Component: Photonsmentioning

confidence: 99%

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Forward physics with the LHCf experiment: a LHC contribution to cosmic-ray physics

Bonechi

Adriani

Berti

et al. 2014

EPJ Web of Conferences

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Abstract. LHCf is a small detector installed at LHC accelerator to measure neutral particle flow in the forward direction of proton -proton (p -p) and proton -nucleus (p -A) interactions. Thanks to the optimal performance that has characterized the last years' running of the LHC collider, several measurements have been taken since 2009 in different running conditions. After data taking for p -p interactions at √ s = 900 GeV, 2.76 TeV and 7 TeV and proton -Lead nucleus (p -Pb) at √ s NN = 5.02 TeV (energy of a couple of projectile and target nucleons in their center of mass reference frame), LHCf is now going to complete its physics program with the 13 TeV p -p run foreseen in 2015. The complete set of results will become a reference data set of forward physics for the calibration and tuning of the hadronic interaction models currently used for the simulation of the atmospheric showers induced by very high energy cosmic rays. For this reason we think that LHCf is giving an important contribution for the study of cosmic rays at the highest energies. In this paper the experiment, the published results and the current status are reviewed.

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Measurement of the inclusive energy spectrum in the very forward direction in proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV

Sirunyan¹,

Erbacher²,

Montoya³

et al. 2017

J. High Energ. Phys.

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The differential cross section for inclusive particle production as a function of energy in proton-proton collisions at a center-of-mass energy of 13 TeV is measured in the very forward region of the CMS detector. The measurement is based on data collected with the CMS apparatus at the LHC, and corresponds to an integrated luminosity of 0.34 µb −1 . The energy is measured in the CASTOR calorimeter, which covers the pseudorapidity region −6.6 < η < −5.2. The results are given as a function of the total energy deposited in CASTOR, as well as of its electromagnetic and hadronic components. The spectra are sensitive to the modeling of multiparton interactions in pp collisions, and provide new constraints for hadronic interaction models used in collider and in high energy cosmic ray physics. The CMS collaboration 12 IntroductionParticle production at very forward rapidities (|η| > 5) in high energy hadronic collisions receives contributions from multiparton interactions (MPI), initial-and final-state radiation (from the hardest parton scattering), fragmentation of the so-called "beam remnants", plus diffraction [1]. The sum of all these particle production mechanisms, typically referred to as the "underlying event" [2], is modeled phenomenologically in hadronic Monte Carlo event generators with parameters tuned from the data [3][4][5]. A good understanding of forward particle production is important for a complete description of the final states in proton-proton (pp) interactions at colliders, as well as to accurately simulate extensive air showers induced in the earth atmosphere by very high energy cosmic rays [6]. In particular, forward charged hadron production has direct impact on the total number of air-shower muons at the ground, whose measurement shows unexplained excesses compared to model predictions [7]. The rapidities covered in the presented measurement (−6.6 < η < −5.2, still well separated from the beam rapidity y ≈ 9.5) are mostly sensitive to the MPI activity [8]. Previous studies of very forward particle production in pp collisions have been carried out at center-of-mass energies of 0.9, 2.76, 7 and 8 TeV by CMS [8, 9], at 7 and 8 TeV by TOTEM [9][10][11], and at 7 TeV by LHCf [12, 13]. The present paper reports new measurements of inclusive energy spectra at a center-of-mass energy of 13 TeV. The data are discussed in terms of the production of electrons and photons (mostly from π 0 decays), as well as hadrons (mostly π ± ) in the very forward direction covered by the CASTOR calorimeter of the CMS experiment at the CERN LHC. CASTOR [14] covers the pseudorapidity region −6.6 < η < −5.2, and can distinguish between electromagnetic and hadronic energy depositions. CASTOR is only installed on the negative z-side of CMS, and hence has acceptance at negative pseudorapidities. Because of CASTOR's very forward location, the data are sensitive to parton interactions at very small and large fractional momenta in the proton, x < 10 −4 and x → 1.-1 -

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Measurement of zero degree single photon energy spectra for s=7 TeV proton–proton collisions at LHC

Cited by 85 publications

References 19 publications

Recent Results from the LHCf Experiment

Recent Results from the LHCf Experiment

Forward physics with the LHCf experiment: a LHC contribution to cosmic-ray physics

Measurement of the inclusive energy spectrum in the very forward direction in proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV

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