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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
Abstract : 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.
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Submitted on : Wednesday, February 23, 2011 - 2:28:32 PM
Last modification on : Wednesday, July 22, 2020 - 9:54:10 AM

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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, Springer, 2011, 03, pp.136. ⟨10.1007/JHEP03(2011)136⟩. ⟨in2p3-00568769⟩

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