Measurement of $\chi_{c1}$ and $\chi_{c2}$ production with $\sqrt{s}$ = 7 TeV $pp$ collisions at ATLAS - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Journal of High Energy Physics Année : 2014

Measurement of $\chi_{c1}$ and $\chi_{c2}$ production with $\sqrt{s}$ = 7 TeV $pp$ collisions at ATLAS

G. Aad , S. Albrand (1) , J. Brown (1) , Q. Buat (1) , B. Clement (1) , J. Collot (1) , S. Crépé-Renaudin (1) , B. Dechenaux (1) , T. Delemontex (1) , P.A. Delsart (1) , C. Gabaldon (1) , M.H. Genest (1) , J.Y. Hostachy (1) , E. Laisne (1) , B.T. Le (1) , F. Ledroit-Guillon (1) , A. Lleres (1) , A. Lucotte (1) , F. Malek (1) , C. Monini (1) , J. Stark (1) , X. Sun (1) , B. Trocmé (1) , G. Rahal (2) , D. Boumediene (3) , Emmanuel Busato (3) , D. Calvet (3) , S. Calvet (3) , J. Donini (3) , E. Dubreuil (3) , N. Ghodbane (3) , Ph. Gris (3) , C. Guicheney (3) , H. Liao (3) , D. Pallin (3) , Daniela Paredes Hernández (3) , F. Podlyski (3) , C. Santoni (3) , Timothée Theveneaux-Pelzer (3) , Loïc Valery (3) , F. Vazeille (3) , N. Berger (4) , M. Delmastro (4) , L. Di Ciaccio (4) , T.K.O. Doan (4) , S. Elles (4) , C. Goy (4) , T. Hryn'Ova (4) , S. Jézéquel (4) , H. Keoshkerian (4) , R. Lafaye (4) , J. Leveque (4) , V.P. Lombardo (4) , N. Massol (4) , E. Petit (4) , H. Przysiezniak (4) , G. Sauvage (4) , E. Sauvan (4) , M. Schwoerer (4) , T. Todorov (4) , I. Wingerter-Seez (4) , R. Zitoun (4) , S. Abdel Khalek (5) , E. Augé (5) , A. Bassalat (5) , C. Becot (5) , S. Binet (5) , C. Bourdarios (5) , D. Charfeddine (5) , C. de La Taille (5) , J.B. de Vivie de Regie (5) , L. Duflot (5) , M. Escalier (5) , L. Fayard (5) , D. Fournier (5) , J.-F. Grivaz (5) , T. Guillemin (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) , L. Poggioli (5) , P. Puzo (5) , A. Renaud (5) , D. Rousseau (5) , G. Rybkin (5) , A.C. Schaffer (5) , E. Scifo (5) , L. Serin (5) , S. Simion (5) , R. Tanaka (5) , H.L. Tran (5) , D. Zerwas (5) , Zhiqing Zhang (5) , L. Alio (6) , M. Barbero (6) , C.P. Bee (6) , C. Bertella (6) , N. Bousson (6) , J. C. Clémens (6) , Y. Coadou (6) , F. Djama (6) , F. Etienne (6) , L. Feligioni (6) , D. Hoffmann (6) , F. Hubaut (6) , E. B. F. G. Knoops (6) , E. Le Guirriec (6) , B. Li (6) , J. Maurer (6) , E. Monnier (6) , S. Muanza (6) , Y. Nagai (6) , P. Pralavorio (6) , A. Rozanov (6) , T. Serre (6) , M. Talby (6) , N. Tannoury (6) , E. Tiouchichine (6) , S. Tisserant (6) , J. Toth (6) , F. Touchard (6) , M. Ughetto (6) , L. Vacavant (6) , I. Koletsou (4) , O. Simard (4)
G. Aad
S. Calvet
N. Berger
C. Goy
T. Hryn'Ova
E. Augé
D. Rousseau
Zhiqing Zhang
  • Fonction : Auteur
  • PersonId : 829631
Y. Coadou

Résumé

The prompt and non-prompt production cross-sections for the chi_c1 and chi_c2 charmonium states are measured in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector at the LHC using 4.5 fb^-1 of integrated luminosity. The chi_c states are reconstructed through the radiative decay chi_c -> J/psi gamma (with J/psi -> mu+mu-) where photons are reconstructed from gamma -> e+e- conversions. The production rate of the chi_c2 state relative to the chi_c1 state is measured for prompt and non-prompt chi_c as a function of J/psi transverse momentum. The prompt chi_c cross-sections are combined with existing measurements of prompt J/psi production to derive the fraction of prompt J/psi produced in feed-down from chi_c decays. The fractions of chi_c1 and chi_c2 produced in b-hadron decays are also measured. In addition to measurements of inclusive chi_c production, the branching fraction B(B+ -> chi_c1 K+) = (4.9 +/- 0.9 stat. +/- 0.6 syst.) * 10^-4 is measured with the same dataset and chi_c event selection.
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in2p3-00984965 , version 1 (07-06-2021)

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G. Aad, S. Albrand, J. Brown, Q. Buat, B. Clement, et al.. Measurement of $\chi_{c1}$ and $\chi_{c2}$ production with $\sqrt{s}$ = 7 TeV $pp$ collisions at ATLAS. Journal of High Energy Physics, 2014, 7, pp.154. ⟨10.1007/JHEP07(2014)154⟩. ⟨in2p3-00984965⟩
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