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

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

doi:10.1016/j.physletb.2011.07.077

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

114 Citations (Scopus)

Abstract

In early 2010, the Large Hadron Collider forward (LHCf) experiment measured very forward neutral particle spectra in LHC proton-proton collisions. From a limited data set taken under the best beam conditions (low beam-gas background and low occurrence of pile-up events), the single photon spectra at √s=7 TeV and pseudo-rapidity (Η) ranges from 8.81 to 8.99 and from 10.94 to infinity were obtained for the first time and are reported in this Letter. The spectra from two independent LHCf detectors are consistent with one another and serve as a cross check of the data. The photon spectra are also compared with the predictions of several hadron interaction models that are used extensively for modeling ultra-high energy cosmic-ray showers. Despite conservative estimates for the systematic errors, none of the models agree perfectly with the measurements. A notable difference is found between the data and the DPMJET 3.04 and PYTHIA 8.145 hadron interaction models above 2 TeV where the models predict higher photon yield than the data. The QGSJET II-03 model predicts overall lower photon yield than the data, especially above 2 TeV in the rapidity range 8.81<η<8.99.

Original language	English
Pages (from-to)	128-134
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	703
Issue number	2
DOIs	https://doi.org/10.1016/j.physletb.2011.07.077
Publication status	Published - 2011 Sept 7

Keywords

Hadron interaction models
LHC
Ultra-high energy cosmic-ray

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2011.07.077

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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., ... Yoshida, K. (2011). Measurement of zero degree single photon energy spectra for √s=7 TeV proton-proton collisions at LHC. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 703(2), 128-134. https://doi.org/10.1016/j.physletb.2011.07.077

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, AL, Ricciarini, S, Sako, T, Shimizu, Y, Suzuki, K, Suzuki, T, Taki, K, Tamura, T, Torii, S, Tricomi, A, Turner, WC, Velasco, J, Viciani, A & Yoshida, K 2011, 'Measurement of zero degree single photon energy spectra for √s=7 TeV proton-proton collisions at LHC', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 703, no. 2, pp. 128-134. https://doi.org/10.1016/j.physletb.2011.07.077

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title = "Measurement of zero degree single photon energy spectra for √s=7 TeV proton-proton collisions at LHC",

abstract = "In early 2010, the Large Hadron Collider forward (LHCf) experiment measured very forward neutral particle spectra in LHC proton-proton collisions. From a limited data set taken under the best beam conditions (low beam-gas background and low occurrence of pile-up events), the single photon spectra at √s=7 TeV and pseudo-rapidity (Η) ranges from 8.81 to 8.99 and from 10.94 to infinity were obtained for the first time and are reported in this Letter. The spectra from two independent LHCf detectors are consistent with one another and serve as a cross check of the data. The photon spectra are also compared with the predictions of several hadron interaction models that are used extensively for modeling ultra-high energy cosmic-ray showers. Despite conservative estimates for the systematic errors, none of the models agree perfectly with the measurements. A notable difference is found between the data and the DPMJET 3.04 and PYTHIA 8.145 hadron interaction models above 2 TeV where the models predict higher photon yield than the data. The QGSJET II-03 model predicts overall lower photon yield than the data, especially above 2 TeV in the rapidity range 8.81<η<8.99.",

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

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T1 - Measurement of zero degree single photon energy spectra for √s=7 TeV proton-proton collisions at LHC

AU - Adriani, O.

AU - Bonechi, L.

AU - Bongi, M.

AU - Castellini, G.

AU - D'Alessandro, R.

AU - Faus, A.

AU - Fukatsu, K.

AU - Haguenauer, M.

AU - Itow, Y.

AU - Kasahara, K.

AU - Kawade, K.

AU - Macina, D.

AU - Mase, T.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Menjo, H.

AU - Mitsuka, G.

AU - Muraki, Y.

AU - Nakai, M.

AU - Noda, K.

AU - Papini, P.

AU - Perrot, A. L.

AU - Ricciarini, S.

AU - Sako, T.

AU - Shimizu, Y.

AU - Suzuki, K.

AU - Suzuki, T.

AU - Taki, K.

AU - Tamura, T.

AU - Torii, Shoji

AU - Tricomi, A.

AU - Turner, W. C.

AU - Velasco, J.

AU - Viciani, A.

AU - Yoshida, K.

PY - 2011/9/7

Y1 - 2011/9/7

N2 - In early 2010, the Large Hadron Collider forward (LHCf) experiment measured very forward neutral particle spectra in LHC proton-proton collisions. From a limited data set taken under the best beam conditions (low beam-gas background and low occurrence of pile-up events), the single photon spectra at √s=7 TeV and pseudo-rapidity (Η) ranges from 8.81 to 8.99 and from 10.94 to infinity were obtained for the first time and are reported in this Letter. The spectra from two independent LHCf detectors are consistent with one another and serve as a cross check of the data. The photon spectra are also compared with the predictions of several hadron interaction models that are used extensively for modeling ultra-high energy cosmic-ray showers. Despite conservative estimates for the systematic errors, none of the models agree perfectly with the measurements. A notable difference is found between the data and the DPMJET 3.04 and PYTHIA 8.145 hadron interaction models above 2 TeV where the models predict higher photon yield than the data. The QGSJET II-03 model predicts overall lower photon yield than the data, especially above 2 TeV in the rapidity range 8.81<η<8.99.

AB - In early 2010, the Large Hadron Collider forward (LHCf) experiment measured very forward neutral particle spectra in LHC proton-proton collisions. From a limited data set taken under the best beam conditions (low beam-gas background and low occurrence of pile-up events), the single photon spectra at √s=7 TeV and pseudo-rapidity (Η) ranges from 8.81 to 8.99 and from 10.94 to infinity were obtained for the first time and are reported in this Letter. The spectra from two independent LHCf detectors are consistent with one another and serve as a cross check of the data. The photon spectra are also compared with the predictions of several hadron interaction models that are used extensively for modeling ultra-high energy cosmic-ray showers. Despite conservative estimates for the systematic errors, none of the models agree perfectly with the measurements. A notable difference is found between the data and the DPMJET 3.04 and PYTHIA 8.145 hadron interaction models above 2 TeV where the models predict higher photon yield than the data. The QGSJET II-03 model predicts overall lower photon yield than the data, especially above 2 TeV in the rapidity range 8.81<η<8.99.

KW - Hadron interaction models

KW - LHC

KW - Ultra-high energy cosmic-ray

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

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

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