Measurement of the Inelastic Proton-Proton Cross Section at $\sqrt{s} = 13$ TeV with the ATLAS Detector at the LHC

M. Aaboud Z. Barnovska 1 N. Berger 1 M. Delmastro 1 L. Di Ciaccio 1 S. Elles 1 K. Grevtsov 1 T. Guillemin 1 T. Hryn’ova 1 S. Jézéquel 1 I. Koletsou 1 R. Lafaye 1 Jérémy Lévêque 1 P. Mastrandea 1 G. Sauvage 1 E. Sauvan 1 B.H. Smart 1 T. Todorov 1 I. Wingerter-Seez 1 E. Yatsenko 1 M.K. Ayoub 2 A. Bassalat 2 S. Binet 2 C. Becot C. Bourdarios 2 J.B. de Vivie De Regie 2 D. Delgove 2 L. Duflot 2 M. Escalier 2 L. Fayard 2 D. Fournier 2 E.L. Gkougkousis 2 J.-F. Grivaz 2 F. Hariri 2 S. Henrot-Versille 2 J. Hrivnac 2 L. Iconomidou-Fayard 2 M. Kado 2 A. Lounis 2 N. Makovec 2 N. Morange 2 C. Nellist 2 P. Petroff 2 L. Poggioli 2 P. Puzo 2 A. Renaud 2 G. Rybkin 2 D. Rousseau 2 A.C. Schaffer 2 L. Serin 2 E. Scifo 2 S. Simion 2 R. Tanaka 2 D. Zerwas 2 Zhongkai Zhang 2 Y. Zhao 2 G. Rahal 3 D. Boumediene 4 E. Busato 4 D. Calvet 4 S. Calvet 4 A.R. Chomont 4 J. Donini 4 Ph. Gris 4 R. Madar 4 D. Pallin 4 S.M. Romano Saez 4 C. Santoni 4 D. Simon 4 F. Vazeille 4 G. Aad 5 M. Alstaty 5 M. Barbero 5 A. Calandri 5 T.P. Calvet 5 Y. Coadou 5 C. Diaconu 5 S. Diglio 5 F. Djama 5 V. Ellajosyula 5 L. Feligioni 5 J. Gao 5 A. Hadef 5 G.D. Hallewell 5 F. Hubaut 5 S.J. Kahn 5 E. B. F. G. Knoops 5 E. Le Guirriec 5 J. Liu K. Liu 5 D. Madaffari 5 E. Monnier 5 S. Muanza 5 E. Nagy 5 P. Pralavorio 5 Y. Rodina 5 A. Rozanov 5 M. Talby 5 T. Theveneaux-Pelzer 5 R.E. Ticse Torres 5 S. Tisserant 5 J. Toth 5 F. Touchard 5 L. Vacavant 5 Chen Wang 5 S. Albrand 6 S. Berlendis 6 C. Camincher 6 J. Collot 6 S. Crépé-Renaudin 6 P.A. Delsart 6 C. Gabaldon 6 M.H. Genest 6 P.O.J. Gradin 6 J.Y. Hostachy 6 F. Ledroit-Guillon 6 A. Lleres 6 A. Lucotte 6 F. Malek 6 E. Petit 6 J. Stark 6 B. Trocmé 6 M. Wu 6
Abstract : This Letter presents a measurement of the inelastic proton-proton cross section using 60 $\mu$b$^{-1}$ of $pp$ collisions at a center-of-mass energy $\sqrt{s}$ of $13$ TeV with the ATLAS detector at the LHC. Inelastic interactions are selected using highly efficient plastic scintillators in the forward region of the detector. A cross section of $68.2\pm 1.5$ mb is measured in the fiducial region $\xi=M_X^2/s>10^{-6}$, where $M_X$ is the largest invariant mass of the two hadronic systems separated by the largest rapidity gap in the event. For diffractive events this corresponds to cases where at least one proton dissociates to a system of mass larger than 13 GeV. The measurement agrees with a range of theoretical predictions. When extrapolated to the full phase space, the result is consistent with an inelastic cross section increasing with center-of-mass energy, as observed at lower energies.
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Submitted on : Thursday, June 9, 2016 - 10:25:33 AM
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M. Aaboud, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Measurement of the Inelastic Proton-Proton Cross Section at $\sqrt{s} = 13$ TeV with the ATLAS Detector at the LHC. Physical Review Letters, American Physical Society, 2016, 117, pp.182002. ⟨10.1103/PhysRevLett.117.182002⟩. ⟨in2p3-01329367⟩

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