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arXiv 1104.5294hep-ex
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LHC上sqrt(s)= 7 TeV质子-质子碰撞零度单光子能谱的测量

Measurement of zero degree single photon energy spectra for sqrt(s) = 7TeV 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. Ma… 展开作者

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, 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, S. Torii, A. Tricomi, W. C. Turner, J. Velasco, A. Viciani, K. Yoshida

摘要:

在2010年初,大型强子对撞机正向(LHCf)实验测量了LHC质子-质子碰撞中非常正向的中性粒子谱。本文首次报道了在最佳束流条件(低束气背景和低堆积事件发生率)下,利用有限的数据集,获得了sqrt(s)= 7 TeV,赝快度(eta)范围为8.81 ~ 8.99和10.94 ~无穷大的单光子谱。来自两个独立LHCf探测器的光谱彼此一致,并作为数据的交叉检查。光子谱也比较了几个强子相互作用模型,广泛用于模拟超高能宇宙线阵雨的预测。尽管保守估计的系统误差,没有一个模型完全同意与测量。一个显着的差异之间的数据和DPMJET 3.04和PYTHIA 8.145强子相互作用模型高于2 TeV的模型预测的光子产额比数据。QGSJET II-03模型预测的总体光子产额低于数据,特别是在快度范围8.81<eta<8.99的2 TeV以上。

英文摘要:

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 occurance of pile-up events), the single photon spectra at sqrt(s)=7TeV 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 paper. 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 2TeV 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 2TeV in the rapidity range 8.81<eta<8.99.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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