Search for resonances in diphoton events at $\sqrt{s}$=13 TeV with the ATLAS detector

M. Aaboud Z. Barnovska 1 N. Berger 1 M. Delmastro 1 L. Di Ciaccio 1 S. Elles 1 K. Grevtsov 1 T. Hryn’ova 1 S. Jézéquel 1 I. Koletsou 1 R. Lafaye 1 J. Levêque 1 P. Mastrandea 1 G. Sauvage 1 E. Sauvan 1 O. Simard 1 T. Todorov 1 I. Wingerter-Seez 1 E. Yatsenko 1 G. Aad 2 M. Alstaty 2 M. Barbero 2 A. Calandri 2 T.P. Calvet 2 Y. Coadou 2 C. Diaconu 2 S. Diglio 2 F. Djama 2 V. Ellajosyula 2 L. Feligioni 2 A. Hadef 2 G.D. Hallewell 2 F. Hubaut 2 S.J. Kahn 2 E. B. F. G. Knoops 2 E. Le Guirriec 2 J. Liu 2 K. Liu 2 D. Madaffari 2 E. Monnier 2 S. Muanza 2 E. Nagy 2 P. Pralavorio 2 Y. Rodina 2 A. Rozanov 2 M. Talby 2 T. Theveneaux-Pelzer 2 R.E. Ticse Torres 2 S. Tisserant 2 J. Toth 2 F. Touchard 2 L. Vacavant 2 Chen Wang 2 D. Boumediene 3 E. Busato 3 D. Calvet 3 S. Calvet 3 A.R. Chomont 3 J. Donini 3 Ph. Gris 3 R. Madar 3 D. Pallin 3 S.M. Romano Saez 3 C. Santoni 3 D. Simon 3 F. Vazeille 3 M.K. Ayoub 4 A. Bassalat 4 S. Binet 4 C. Becot C. Bourdarios 4 J.B. de Vivie De Regie 4 D. Delgove 4 L. Duflot 4 M. Escalier 4 L. Fayard 4 D. Fournier 4 E.L. Gkougkousis 4 J.-F. Grivaz 4 T. Guillemin 4 F. Hariri 4 S. Henrot-Versille 4 J. Hrivnac 4 L. Iconomidou-Fayard 4 M. Kado 4 A. Lounis 4 N. Makovec 4 N. Morange 4 C. Nellist 4 P. Petroff 4 L. Poggioli 4 P. Puzo 4 A. Renaud 4 G. Rybkin 4 D. Rousseau 4 A.C. Schaffer 4 L. Serin 4 E. Scifo 4 S. Simion 4 R. Tanaka 4 D. Zerwas 4 Zhongkai Zhang 4 Y. Zhao 4 G. Rahal 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 T. Meideck E. Petit 6 J. Stark 6 B. Trocmé 6 M. Wu 6
Abstract : Searches for new resonances decaying into two photons in the ATLAS experiment at the CERN Large Hadron Collider are described. The analysis is based on proton--proton collision data corresponding to an integrated luminosity of 3.2 fb$^{-1}$ at $\sqrt{s} = 13$ TeV recorded in 2015. Two searches are performed, one targeted at a spin-2 particle of mass larger than 500 GeV, using Randall--Sundrum graviton states as a benchmark model, and one optimized for a spin-0 particle of mass larger than 200 GeV. Varying both the mass and the decay width, the most significant deviation from the background-only hypothesis is observed at a diphoton invariant mass around 750 GeV with local significances of 3.8 and 3.9 standard deviations in the searches optimized for a spin-2 and spin-0 particle, respectively. The global significances are estimated to be 2.1 standard deviations for both analyses. The consistency between the data collected at 13 TeV and 8 TeV is also evaluated. Limits on the production cross section times branching ratio to two photons for the two resonance types are reported.
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Article dans une revue
Journal of High Energy Physics, Springer Verlag (Germany), 2016, 09, pp.001. 〈10.1007/JHEP09(2016)001〉
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Soumis le : mardi 14 juin 2016 - 09:50:09
Dernière modification le : mardi 5 juin 2018 - 16:40:03

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M. Aaboud, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Search for resonances in diphoton events at $\sqrt{s}$=13 TeV with the ATLAS detector. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 09, pp.001. 〈10.1007/JHEP09(2016)001〉. 〈in2p3-01331581〉

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