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Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

G. Aad S. Albrand 1 M.L. Andrieux 1 Q. Buat 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 T. Delemontex 1 P.A. Delsart 1 M.H. Genest 1 J.Y. Hostachy 1 E. Laisne 1 F. Ledroit-Guillon 1 A. Lleres 1 A. Lucotte 1 F. Malek 1 P. Martin 1 F. Polci 1 J. Stark 1 X. Sun 1 B. Trocmé 1 J. Wang 1 C. Weydert 1 C. Biscarat 2 E. Cogneras 2 G. Rahal 2 D. Boumediene 3 Emmanuel Busato 3 D. Calvet 3 S. Calvet 3 Reina Coromoto Camacho Toro 3 Diane Cinca 4 J. Donini 3 R. Febbraro 3 N. Ghodbane 3 C. Guicheney 3 H. Liao 3 D. Pallin 3 F. Podlyski 3 C. Santoni 3 L. P. Says 3 F. Vazeille 3 T. Beau 5 S. Bordoni 5 G. Calderini 5 A. Camard 5 P. Cavalleri 5 E. Chareyre 5 S. de Cecco 5 F. Derue 5 D. Imbault 5 M.W. Krasny 5 D. Lacour 5 B. Laforge 5 O. Le Dortz 5 J. Lellouch 5 G. Marchiori 5 I. Nikolic-Audit 5 J. Ocariz 5 M. Ridel 5 L. Roos 5 Ph. Schwemling 5 Timothée Theveneaux-Pelzer 5 S. Trincaz-Duvoid 5 T.N. Trinh 5 F. Vannucci 6 H. Abreu 7 N. Andari 7 C. Arnault 7 E. Augé 7 P. Barrillon 7 M. Benoit S. Binet 7 J.-B. Blanchard 7 C. Bourdarios 7 D. Breton 7 C. Collard C. de la Taille 7 J.B. de Vivie de Regie 7 S. Diglio 7 L. Duflot 7 M. Escalier 7 A.C. Falou 7 L. Fayard 7 D. Fournier 7 J.-F. Grivaz 7 M. Heller 7 S. Henrot-Versillé 7 J. Hrivnac 7 L. Iconomidou-Fayard 7 J. Idarraga 7 M. Kado 7 A. Lounis 7 N. Makovec 7 P. Matricon 7 F. Niedercorn 7 L. Poggioli 7 P. Puzo 7 A. Renaud 7 D. Rousseau 7 X. Ruan 7 G. Rybkin 7 J.B. Sauvan 7 J. Schaarschmidt 7 A.C. Schaffer 7 L. Serin 7 S. Simion 7 R. Tanaka 7 J.J. Veillet 7 I. Vukotic 7 F. Wicek 7 D. Zerwas 7 Zhiqing Zhang 7 L. Aperio Bella 8 B. Aubert 8 N. Berger 8 J. Colas 8 M. Delmastro 8 L. Di Ciaccio 8 T.K.O. Doan 8 S. Elles 8 C. Goy 8 L. Helary 8 T. Hryn'Ova 8 A. Jérémie 8 S. Jézéquel 8 M. Kataoka 8 J. Labbe 8 R. Lafaye 8 J. Leveque 8 V.P. Lombardo 8 N. Massol 8 P. Perrodo 8 E. Petit 8 H. Przysiezniak 8 E. Richter-Was 8 G. Sauvage 8 E. Sauvan 8 M. Schwoerer 8 T. Todorov 8 D. Tsionou 8 I. Wingerter-Seez 8 R. Zitoun 8 Y. Zolnierowski 8 S. Aoun 9 C. P. Bee 9 C. Benchouk 9 C. Bertella 9 N. Bousson 9 J. C. Clémens 9 Y. Coadou 9 F. Djama 9 F. Etienne 9 L. Feligioni 9 F. Henry-Couannier 9 D. Hoffmann 9 F. Hubaut 9 E. B. F. G. Knoops 9 E. Le Guirriec 9 B. Li 9 J. Maurer 9 E. Monnier 9 J. Odier 9 P. Pralavorio 9 Z. Qian 9 A. Rozanov 9 M. Talby 9 N. Tannoury 9 S. Tisserant 9 J. Toth 9 F. Touchard 9 L. Vacavant 9
Abstract : The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.539+/-0.004 (stat.)+/-0.008 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.
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Submitted on : Thursday, December 22, 2011 - 8:29:26 AM
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G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS. Physical Review Letters, American Physical Society, 2012, 108, pp.152001. ⟨10.1103/PhysRevLett.108.152001⟩. ⟨in2p3-00654499⟩

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