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Article Dans Une Revue Journal of High Energy Physics Année : 2011

Measurement of B anti-B Angular Correlations based on Secondary Vertex Reconstruction at sqrt(s)=7 TeV

V. Khachatryan , D. Sillou (1) , M. Besancon (2) , S. Choudhury (2) , M. Dejardin (2) , D. Denegri (2) , B. Fabbro (2) , J.L. Faure (2) , F. Ferri (2) , S. Ganjour (2) , F.X. Gentit (2) , A. Givernaud (2) , P. Gras (2) , G. Hamel de Monchenault (2) , P. Jarry (2) , E. Locci (2) , J. Malcles (2) , M. Marionneau (2) , L. Millischer (2) , J. Rander (2) , A. Rosowsky (2) , I. Shreyber (2) , M. Titov (2) , P. Verrecchia (2) , S. Baffioni (3) , F. Beaudette (3) , L. Bianchini (3) , M. Bluj (3) , C. Broutin (3) , Pierre Busson (3) , C. Charlot (3) , T. Dahms (3) , L. Dobrzynski (3) , R. Granier de Cassagnac (3) , M. Haguenauer (3) , P. Miné (3) , C. Mironov (3) , C. Ochando (3) , P. Paganini (3) , T. Roxlo (3) , D. Sabes (3) , R. Salerno (3) , Y. Sirois (3) , C. Thiebaux (3) , B. Wyslouch (3) , A. Zabi (3) , J.-L. Agram (4) , J. Andrea (4) , A. Besson (4) , D. Bloch (4) , D. Bodin (4) , J.-M. Brom (4) , M. Cardaci (4) , E.C. Chabert (4) , C. Collard (4) , E. Conte (4) , F. Drouhin (4) , C. Ferro (4) , J.-C. Fontaine (4) , D. Gelé (4) , U. Goerlach (4) , S. Greder (4) , P. Juillot (4) , M. Karim (4) , A.-C. Le Bihan (4) , Y. Mikami (4) , P. van Hove (4) , F. Fassi (5) , D. Mercier (5) , C. Baty (6) , N. Beaupere (6) , M. Bedjidian (6) , O. Bondu (6) , G. Boudoul (6) , D. Boumediene (6) , H. Brun (6) , N. Chanon (6) , R. Chierici (6) , D. Contardo (6) , P. Depasse (6) , H. El Mamouni (7) , A. Falkiewicz (6) , J. Fay (6) , S. Gascon (6) , B. Ille (6) , T. Kurca (6) , T. Le Grand (6) , M. Lethuillier (6) , L. Mirabito (6) , S. Perries (6) , V. Sordini (6) , S. Tosi (6) , Y. Tschudi (6) , P. Verdier (6) , H. Xiao (6)
V. Khachatryan
  • Fonction : Auteur
Pierre Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
C. Thiebaux
J.-L. Agram
A. Besson
C. Collard
E. Conte
P. van Hove
N. Chanon
D. Contardo
H. El Mamouni
  • Fonction : Auteur
CMS
M. Lethuillier
V. Sordini
P. Verdier

Résumé

A measurement of the angular correlations between beauty and anti-beauty hadrons (B B-bar) produced in pp collisions at a centre-of-mass energy of 7 TeV at the CERN LHC is presented, probing for the first time the region of small angular separation. The B hadrons are identified by the presence of displaced secondary vertices from their decays. The B hadron angular separation is reconstructed from the decay vertices and the primary-interaction vertex. The differential B B-bar production cross section, measured from a data sample collected by CMS and corresponding to an integrated luminosity of 3.1 inverse picobarns, shows that a sizable fraction of the B B-bar pairs are produced with small opening angles. These studies provide a test of QCD and further insight into the dynamics of b b-bar production.

Dates et versions

in2p3-00568769 , version 1 (23-02-2011)

Identifiants

Citer

V. Khachatryan, D. Sillou, M. Besancon, S. Choudhury, M. Dejardin, et al.. Measurement of B anti-B Angular Correlations based on Secondary Vertex Reconstruction at sqrt(s)=7 TeV. Journal of High Energy Physics, 2011, 03, pp.136. ⟨10.1007/JHEP03(2011)136⟩. ⟨in2p3-00568769⟩
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