Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at s√ = 8 TeV using the ATLAS experiment

G. Aad 1 M.K. Ayoub 2 A. Bassalat 2 C. Becot 2 S. Binet 2 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 T. Guillemin 2 F. Hariri 2 S. Henrot-Versillé 2 J. Hrivnac 2 L. Iconomidou-Fayard 2 M. Kado 2 A. Lounis 2 N. Makovec 2 N. Morange 2 C. Nellist 2 L. Poggioli 2 P. Puzo 2 A. Renaud 2 D. Rousseau 2 G. Rybkin 2 A.C. Schaffer 2 E. Scifo 2 L. Serin 2 S. Simion 2 R. Tanaka 2 H.L. Tran 2 D. Zerwas 2 Zhongkai Zhang 2 Y. Zhao 2 G. Rahal 3 D. Boumediene 4 Emmanuel Busato 4 D. Calvet 4 S. Calvet 4 J. Donini 4 E. Dubreuil 4 G. Gilles 4 Ph. Gris 4 H. Liao 4 R. Madar 4 D. Pallin 4 S.M. Romano Saez 4 C. Santoni 4 D. Simon 4 Timothée Theveneaux-Pelzer 4 F. Vazeille 4 L. Alio 1 M. Barbero 1 Y. Coadou 1 C. Diaconu 1 S. Diglio 1 F. Djama 1 O. Duccu 5, 1 L. Feligioni 1 J. Gao 1, 6 G.D. Hallewell 1 F. Hubaut 1 S.J. Kahn 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 J. Liu K. Liu 1 D. Madaffari 1 K. Mochizuki 1 E. Monnier 1 S. Muanza 1 Y. Nagai 1 E. Nagy 1 P. Pralavorio 1 A. Rozanov T. Serre 1 M. Talby 1 R.E. Ticse Torres 1 E. Tiouchichine 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 L. Vacavant 1 Z. Barnovska 7 N. Berger 7 M. Delmastro 7 L. Di Ciaccio 7 S. Elles 7 T. Hryn’ova 7 S. Jézéquel 7 I. Koletsou 7 R. Lafaye 7 J. Leveque 7 N. Massol 7 G. Sauvage 7 E. Sauvan 1, 7 O. Simard 7 T. Todorov 7 I. Wingerter-Seez 7 E. Yatsenko 7 S. Albrand 8 J. Brown 8 J. Collot 8 S. Crépé-Renaudin 8 P.A. Delsart 8 C. Gabaldon 8 M.H. Genest 8 J.Y. Hostachy 8 F. Ledroit-Guillon 8 A. Lleres 8 A. Lucotte 8 F. Malek 8 C. Monini 8 J. Stark 8 B. Trocmé 8 M. Wu 8
Abstract : Many extensions of the Standard Model predict the existence of charged heavy long-lived particles, such as R-hadrons or charginos. These particles, if produced at the Large Hadron Collider, should be moving non-relativistically and are therefore identifiable through the measurement of an anomalously large specific energy loss in the ATLAS pixel detector. Measuring heavy long-lived particles through their track parameters in the vicinity of the interaction vertex provides sensitivity to metastable particles with lifetimes from 0.6 ns to 30 ns. A search for such particles with the ATLAS detector at the Large Hadron Collider is presented, based on a data sample corresponding to an integrated luminosity of 18.4 fb−1 of pp collisions at s√ = 8 TeV. No significant deviation from the Standard Model background expectation is observed, and lifetime-dependent upper limits on R-hadrons and chargino production are set. Gluino R-hadrons with 10 ns lifetime and masses up to 1185 GeV are excluded at 95% confidence level, and so are charginos with 15 ns lifetime and masses up to 482 GeV.
Type de document :
Article dans une revue
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75, pp.407. 〈10.1140/epjc/s10052-015-3609-0〉
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Soumis le : jeudi 18 juin 2015 - 11:37:53
Dernière modification le : mardi 24 juillet 2018 - 15:46:13

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G. Aad, M.K. Ayoub, A. Bassalat, C. Becot, S. Binet, et al.. Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at s√ = 8 TeV using the ATLAS experiment . European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75, pp.407. 〈10.1140/epjc/s10052-015-3609-0〉. 〈in2p3-01164976〉

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