Measurement of zero degree single photon energy spectra for √s=7 TeV proton-proton collisions at LHC
Measurement of zero degree single photon energy spectra for √s=7 TeV proton-proton collisions at LHC
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DOI：
10.1016/j.physletb.2011.07.077
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发表时间：
2011-04
影响因子：
4.4
通讯作者：
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;Yasushi Muraki;M. Nakai;Koji Noda;P. Papini;A. Perrot;S. Ricciarini;T. Sako;Y. Shimizu;K. Suzuki;Tatsuo Suzuki;K. Taki;T. Tamura;S. Torii;A. Tricomi;W. Turner;J. Velasco;A. Viciani;K. Yoshida
中科院分区：
文献类型：
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作者：
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;Yasushi Muraki;M. Nakai;Koji Noda;P. Papini;A. Perrot;S. Ricciarini;T. Sako;Y. Shimizu;K. Suzuki;Tatsuo Suzuki;K. Taki;T. Tamura;S. Torii;A. Tricomi;W. Turner;J. Velasco;A. Viciani;K. Yoshida
2010年初，大型强子对撞机正向(LHCF)实验在LHC质子-质子碰撞中测量到了非常向前的中性粒子谱。根据在最佳束流条件下(低束-气本底和低堆积事件发生率)获得的有限数据集，首次获得了S=7TeV、赝快度(η)为8.81~8.99和10.94~无穷大的单光子光谱，并在本文中作了报道。来自两个独立的LHCF探测器的光谱彼此一致，并用作数据的交叉核对。光子谱还与几个广泛用于模拟超高能宇宙线簇射的强子相互作用模型的预测进行了比较。尽管对系统误差的保守估计，没有一个模型与测量结果完全一致。在2TeV以上的DPMJET3.04和PYTHIA 8.145强子相互作用模型中发现了一个显著的差异，这两个模型预测的光子产额比数据更高。QGSJET II-03模型预测的光子产额总体上比数据要低，特别是在快度范围8.81<；η<；8.99的2TeV以上。
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.