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Measurement of the Upsilon(1S) Production Cross-Section in pp Collisions at sqrt(s) = 7 TeV in ATLAS

G. Aad S. Albrand 1 M.L. Andrieux 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 P. de Saintignon 1 P.A. Delsart 1 J. Donini 1 D. Dzahini 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 C. Weydert 1 C. Biscarat 2 E. Cogneras 2 G. Rahal 2 H. Bachacou 3 F. Bauer 3 N. Besson 3 N.M. Bolnet 3 M. Boonekamp 3 L. Chevalier 3 J. Ernwein 3 A.I. Etienvre 3 A. Formica 3 L. Gauthier 3 F. Giraud 3 C. Guyot 3 S. Hassani 3 W. Kozanecki 3 E. Lancon 3 J.F. Laporte 3 E. Le Menedeu 3 M. Legendre 3 B. Mansoulie 3 J.-P. Meyer 3 N. Morange 3 E. Mountricha 3 R. Nicolaidou 3 A. Ouraou 3 D.M. Pomarede 3 B. Resende 3 C.R. Royon 3 Ph. Schune 3 J. Schwindling 3 O. Simard 3 M. Virchaux 3 C. Xu 3 J. Yu 3 Emmanuel Busato 4 D. Calvet 4 S. Calvet 4 Reina Coromoto Camacho Toro 4 Diane Cinca 5 R. Febbraro 4 N. Ghodbane 4 C. Guicheney 4 D. Pallin 4 F. Podlyski 4 C. Santoni 4 L. P. Says 4 F. Vazeille 4 H. Abreu 6 N. Andari 6 C. Arnault 6 E. Augé 6 P. Barrillon 6 M. Benoit 6 S. Binet 6 J.-B. Blanchard 6 C. Bourdarios 6 D. Breton 6 C. Collard 6 C. de la Taille 6 J.B. de Vivie de Regie 6 S. Diglio 6 L. Duflot 6 M. Escalier 6 L. Fayard 6 D. Fournier 6 J.-F. Grivaz 6 M. Heller 6 S. Henrot-Versillé 6 J. Hrivnac 6 L. Iconomidou-Fayard 6 J. Idarraga 6 M. Kado 6 A. Lounis 6 N. Makovec 6 P. Matricon 6 F. Niedercorn 6 L. Poggioli 6 P. Puzo 6 A. Renaud 6 D. Rousseau 6 X. Ruan 6 G. Rybkin 6 J.B. Sauvan 6 J. Schaarschmidt 6 A.C. Schaffer 6 L. Serin 6 S. Simion 6 R. Tanaka 6 J.J. Veillet 6 I. Vukotic 6 F. Wicek 6 D. Zerwas 6 Zhiqing Zhang 6 S. Aoun 7 C. P. Bee 7 C. Benchouk 7 K. Bernardet 7 N. Bousson 7 J. C. Clemens 7 Y. Coadou 7 P. Delpierre 7 F. Djama 7 F. Etienne 7 L. Feligioni 7 F. Henry- Couannier 7 D. Hoffmann 7 F. Hubaut 7 E. B. F. G. Knoops 7 E. Le Guirriec 7 B. Li 7 E. Monnier 7 J. Odier 7 E. Petit 7 P. Pralavorio 7 Z. Qian 7 A. Rozanov 7 M. Talby 7 N. Tannoury 7 S. Tisserant 7 J. Toth 7 F. Touchard 7 L. Vacavant 7 T. Beau 8 S. Bordoni 8 G. Calderini 8 P. Cavalleri 8 E. Chareyre 8 S. de Cecco 8 F. Derue 8 D. Imbault 8 M.W. Krasny 8 D. Lacour 8 B. Laforge 8 O. Le Dortz 8 J. Lellouch 8 G. Marchiori 8 I. Nikolic-Audit 8 J. Ocariz 8 M. Ridel 8 L. Roos 8 Ph. Schwemling 8 Timothée Theveneaux-Pelzer 8 S. Trincaz-Duvoid 8 T.N. Trinh 8 F. Vannucci 9 L. Aperio Bella 10 B. Aubert 10 N. Berger 10 J. Colas 10 L. Di Ciaccio 10 T.K.O. Doan 10 S. Elles 10 P. Ghez 10 M. Gouanère 10 C. Goy 10 T. Guillemin 10 L. Helary 10 T. Hryn'Ova 10 G. Ionescu 10 A. Jérémie 10 S. Jézéquel 10 M. Kataoka 10 J. Labbe 10 R. Lafaye 10 J. Leveque 10 N. Massol 10 P. Perrodo 10 H. Przysiezniak 10 G. Sauvage 10 E. Sauvan 10 T. Todorov 10 D. Tsionou 10 I. Wingerter-Seez 10 R. Zitoun 10 Y. Zolnierowski 10 M. Kuna 8 Sandrine Laplace 8, 10 H. Torres 8
Abstract : A measurement of the cross-section for Upsilon(1S) -> mu+mu- production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the Upsilon(1S) transverse momentum in two bins of rapidity, |y(Upsilon1S)| < 1.2 and 1.2 < |y(Upsilon1S)| < 2.4. The measurement requires that both muons have transverse momentum pT(mu) > 4 GeV and pseudorapidity |eta(mu)| < 2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarization. The results are based on an integrated luminosity of 1.13 pb-1, collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in PYTHIA while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet-model.
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Submitted on : Tuesday, June 28, 2011 - 8:51:31 AM
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G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Measurement of the Upsilon(1S) Production Cross-Section in pp Collisions at sqrt(s) = 7 TeV in ATLAS. Physics Letters B, Elsevier, 2011, 705, pp.9-27. ⟨10.1016/j.physletb.2011.09.092⟩. ⟨in2p3-00604062⟩

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