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.

V., K., A. M., S., A., T., W., A., T., B., M., D., et al. (2011). Measurement of B/B angular correlations based on secondary vertex reconstruction at sqrt(s)=7 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 03, 136-198 [10.1007/JHEP03(2011)136].

Measurement of B/B angular correlations based on secondary vertex reconstruction at sqrt(s)=7 TeV

BONACORSI, DANIELE;BRAIBANT, SYLVIE;CAPILUPPI, PAOLO;CASTRO, ANDREA;CUFFIANI, MARCO;FANFANI, ALESSANDRA;FASANELLA, DANIELE;MENEGHELLI, MARCO;NAVARRIA, FRANCESCO LUIGI;PRIMAVERA, FEDERICA;ROSSI, ANTONIO MARIA;ROVELLI, TIZIANO;SIROLI, GIAN PIERO;GUIDUCCI, LUIGI;BRIGLIADORI, LUCA;
2011

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.
2011
V., K., A. M., S., A., T., W., A., T., B., M., D., et al. (2011). Measurement of B/B angular correlations based on secondary vertex reconstruction at sqrt(s)=7 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 03, 136-198 [10.1007/JHEP03(2011)136].
V., Khachatryan; A. M., Sirunyan; A., Tumasyan; W., Adam; T., Bergauer; M., Dragicevic; J. Er . A., N(O; C., Fabjan; M., Friedl; R., Fruhwirth; V. M.,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/119656
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