Measurement of the energy density as a function of pseudorapidity in proton-proton collisions at root s=13 TeV

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Date
2019
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Springer
Abstract

A measurement of the energy density in proton–proton collisions at a centre-of-mass energy of (\sqrt{s}=13) (\phantom{\rule{0.166667em}{0ex}}\text{TeV}) is presented. The data have been recorded with the CMS experiment at the LHC during low luminosity operations in 2015. The energy density is studied as a function of pseudorapidity in the ranges (-\phantom{\rule{0.166667em}{0ex}}6.6<\eta <-\phantom{\rule{0.166667em}{0ex}}5.2) and (3.15<|\eta |<5.20). The results are compared with the predictions of several models. All the models considered suggest a different shape of the pseudorapidity dependence compared to that observed in the data. A comparison with LHC proton–proton collision data at (\sqrt{s}=0.9) and (7\phantom{\rule{0.166667em}{0ex}}\text{TeV}) confirms the compatibility of the data with the hypothesis of limiting fragmentation.

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Keywords
INELASTIC EP SCATTERING, LHC, ANNIHILATION, MODEL, Physics, Particles & Fields, Physics
Citation
Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Dragicevic, M., Erö, J., Del Valle, A. E., Flechl, M., Frühwirth, R., Ghete, V. M., Hrubec, J., Jeitler, M., Krammer, N., Krätschmer, I., Liko, D., … Woods, N. (2019). Measurement of the energy density as a function of pseudorapidity in proton–proton collisions at $\sqrt{s} =13\,\text {TeV} $. In The European Physical Journal C (Vol. 79, Issue 5). Springer Science and Business Media LLC. https://doi.org/10.1140/epjc/s10052-019-6861-x