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

被引：92

作者：

Adriani, O. ^{[2
,3
]}

Bonechi, L. ^{[2
]}

Bongi, M. ^{[2
]}

Castellini, G. ^{[2
,3
]}

D'Alessandro, R. ^{[2
,3
]}

Faus, A. ^{[14
]}

Fukatsu, K. ^{[1
]}

Haguenauer, M. ^{[6
]}

Itow, Y. ^{[1
,5
]}

Kasahara, K. ^{[7
]}

Kawade, K. ^{[1
]}

Macina, D. ^{[8
]}

Mase, T. ^{[1
]}

Masuda, K. ^{[1
]}

Matsubara, Y. ^{[1
]}

Menjo, H. ^{[2
,5
]}

Mitsuka, G. ^{[1
]}

Muraki, Y. ^{[1
]}

Nakai, M. ^{[7
]}

Noda, K. ^{[10
]}

Papini, P. ^{[2
]}

Perrot, A. -L. ^{[8
]}

Ricciarini, S. ^{[2
,4
]}

Sako, T. ^{[1
,5
]}

Shimizu, Y. ^{[7
]}

Suzuki, K. ^{[1
]}

Suzuki, T. ^{[7
]}

Taki, K. ^{[1
]}

Tamura, T. ^{[9
]}

Torii, S. ^{[7
]}

Tricomi, A. ^{[10
,11
]}

Turner, W. C. ^{[12
]}

Velasco, J. ^{[14
]}

Viciani, A. ^{[2
]}

Yoshida, K. ^{[13
]}

机构：

[1] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan

[2] Ist Nazl Fis Nucl, Sect Florence, Florence, Italy

[3] Univ Florence, I-50121 Florence, Italy

[4] Ctr Siciliano Fis Nucl & Strut Mat, Catania, Italy

[5] Nagoya Univ, Kobayashi Maskawa Inst Origin Particles & Univers, Nagoya, Aichi 4648601, Japan

[6] Ecole Polytech, Palaiseau, France

[7] Waseda Univ, RISE, Tokyo, Japan

[8] CERN, CH-1211 Geneva 23, Switzerland

[9] Kanagawa Univ, Kanagawa, Japan

[10] Ist Nazl Fis Nucl, Sect Catania, Catania, Italy

[11] Univ Catania, I-95124 Catania, Italy

[12] LBNL, Berkeley, CA USA

[13] Shibaura Inst Technol, Tokyo, Japan

[14] Ctr Mixto CSIC UVEG, IFIC, Madrid, Spain

来源：

PHYSICS LETTERS B | 2011年 / 703卷 / 02期

关键词：

LHC; Ultra-high energy cosmic-ray; Hadron interaction models; COLLIDER;

D O I：

10.1016/j.physletb.2011.07.077

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 root s = 7 TeV and pseudo-rapidity (eta) 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 < eta < 8.99. (C) 2011 CERN for the benefit of the LHCf collaboration

引用

页码：128 / 134

页数：7

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