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) , Daniel 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 (4) , 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 (5) , N. Andari (5) , C. Arnault (5) , E. Augé (5) , P. Barrillon (5) , M. Benoit (5) , S. Binet (5) , J.-B. Blanchard (5) , C. Bourdarios (5) , D. Breton (5) , C. Collard (5) , C. de La Taille (5) , J.B. de Vivie de Regie (5) , Sara Diglio (5) , L. Duflot (5) , M. Escalier (5) , L. Fayard (5) , D. Fournier (5) , J.-F. Grivaz (5) , M. Heller (5) , S. Henrot-Versillé (5) , J. Hrivnac (5) , L. Iconomidou-Fayard (5) , J. Idarraga (5) , M. Kado (5) , A. Lounis (5) , N. Makovec (5) , P. Matricon (5) , F. Niedercorn (5) , L. Poggioli (5) , P. Puzo (5) , A. Renaud (5) , D. Rousseau (5) , X. Ruan (5) , G. Rybkin (5) , J.B. Sauvan (5) , J. Schaarschmidt (5) , A.C. Schaffer (5) , L. Serin (5) , S. Simion (5) , R. Tanaka (5) , J.J. Veillet (5) , I. Vukotic (5) , F. Wicek (5) , D. Zerwas (5) , Zhiqing Zhang (5) , S. Aoun (6) , C.P. Bee (6) , C. Benchouk (6) , K. Bernardet (6) , N. Bousson (6) , J.C. Clemens (6) , Y. Coadou (6) , P. Delpierre (6) , F. Djama (6) , F. Etienne (6) , L. Feligioni (6) , F. Henry- Couannier (6) , D. Hoffmann (6) , F. Hubaut (6) , E. B. F. G. Knoops (6) , E. Le Guirriec (6) , B. Li (6) , E. Monnier (6) , J. Odier (6) , E. Petit (6) , P. Pralavorio (6) , Z. Qian (6) , A. Rozanov (6) , M. Talby (6) , N. Tannoury (6) , S. Tisserant (6) , J. Toth (6) , F. Touchard (6) , L. Vacavant (6) , T. Beau (7) , S. Bordoni (7) , G. Calderini (7) , P. Cavalleri (7) , E. Chareyre (7) , S. de Cecco (7) , F. Derue (7) , D. Imbault (7) , M.W. Krasny (7) , D. Lacour (7) , B. Laforge (7) , O. Le Dortz (7) , J. Lellouch (7) , G. Marchiori (7) , I. Nikolic-Audit (7) , J. Ocariz (7) , M. Ridel (7) , L. Roos (7) , Ph. Schwemling (7) , Timothée Theveneaux-Pelzer (7) , S. Trincaz-Duvoid (7) , T.N. Trinh (7) , F. Vannucci (8) , L. Aperio Bella (9) , B. Aubert (9) , N. Berger (9) , J. Colas (9) , L. Di Ciaccio (9) , T.K.O. Doan (9) , S. Elles (9) , P. Ghez (9) , M. Gouanère (9) , C. Goy (9) , T. Guillemin (9) , L. Helary (9) , T. Hryn'Ova (9) , G. Ionescu (9) , A. Jérémie (9) , S. Jézéquel (9) , M. Kataoka (9) , J. Labbe (9) , R. Lafaye (9) , J. Leveque (9) , N. Massol (9) , P. Perrodo (9) , H. Przysiezniak (9) , G. Sauvage (9) , E. Sauvan (9) , T. Todorov (9) , D. Tsionou (9) , I. Wingerter-Seez (9) , R. Zitoun (9) , Y. Zolnierowski (9) , M. Kuna (7) , Sandrine Laplace (7) , H. Torres (7)

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 LAL - Laboratoire de l'Accélérateur Linéaire
6 CPPM - Centre de Physique des Particules de Marseille
7 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
8 APC - Neutrinos
9 LAPP - Laboratoire d'Annecy de Physique des Particules

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.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

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, 2011, 705, pp.9-27. ⟨10.1016/j.physletb.2011.09.092⟩. ⟨in2p3-00604062⟩