Measurement of BB angular correlations based on secondary vertex reconstruction at √s=7  TeV

Vardan Khachatryan; Pierluigi Bortignon; Lea Caminada; Zhiling Chen; Sergio Cittolin; Günther Dissertori; Michael Dittmar; Jürg Eugster; Klaus Freudenreich; Christoph Grab; Alain Hervé; Wieland Hintz; Pierre Lecomte; Werner Lustermann; Carmelo Marchica; Pablo Martinez Ruiz Del Arbol; Paolo Meridiani; Predrag Milenovic; Filip Moortgat; Pascal Nef; Francesca Nessi-Tedaldi; Luc Pape; Felicitas Pauss; Thomas Punz; Andrea Rizzi; Frédéric J Ronga; Marco Rossini; Leonardo Sala; Ann-Karin Sanchez; Marie-Christine Sawley; Benjamin Stieger; Ludwig Tauscher; Alessandro Thea; Konstantinos Theofilatos; Daniel Treille; Christina Urscheler; Rainer Wallny; Matthias Weber; Lukas Wehrli; Joanna Weng; CMS Collaboration

doi:10.1007/JHEP03(2011)136

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Measurement of BB angular correlations based on secondary vertex reconstruction at √s=7 TeV

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Measurement of BB angular correlations based on secondary vertex reconstruction at √s=7 TeV

Vardan Khachatryan, Pierluigi Bortignon, Lea Caminada, Zhiling Chen, Sergio Cittolin, Günther Dissertori, Michael Dittmar, Jürg Eugster, Klaus Freudenreich, Christoph Grab, …

The journal of high energy physics, Vol.2011(3), 136

03/01/2011

DOI: 10.1007/JHEP03(2011)136

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Abstract

A measurement of the angular correlations between beauty and anti-beauty hadrons (BB¯¯¯¯) 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 BB¯¯¯¯ production cross section, measured from a data sample collected by CMS and corresponding to an integrated luminosity of 3.1 pb−1, shows that a sizable fraction of the BB¯¯¯¯ pairs are produced with small opening angles. These studies provide a test of QCD and further insight into the dynamics of bb¯¯¯ production.

High Energy Physics

Experiment

Hadron

Hadron scattering

Phenomenology

Details

Title: Subtitle: Measurement of BB angular correlations based on secondary vertex reconstruction at √s=7 TeV
Creators: Vardan Khachatryan
Pierluigi Bortignon
Lea Caminada
Zhiling Chen
Sergio Cittolin
Günther Dissertori
Michael Dittmar
Jürg Eugster
Klaus Freudenreich
Christoph Grab
Alain Hervé
Wieland Hintz
Pierre Lecomte
Werner Lustermann
Carmelo Marchica
Pablo Martinez Ruiz Del Arbol
Paolo Meridiani
Predrag Milenovic
Filip Moortgat
Pascal Nef
Francesca Nessi-Tedaldi
Luc Pape
Felicitas Pauss
Thomas Punz
Andrea Rizzi
Frédéric J Ronga
Marco Rossini
Leonardo Sala
Ann-Karin Sanchez
Marie-Christine Sawley
Benjamin Stieger
Ludwig Tauscher
Alessandro Thea
Konstantinos Theofilatos
Daniel Treille
Christina Urscheler
Rainer Wallny
Matthias Weber - RWTH Aachen University
Lukas Wehrli
Joanna Weng
CMS Collaboration
Contributors: E. A Albayrak (Contributor) - University of Iowa, Physics and Astronomy
J Nachtman (Contributor) - University of Iowa, Physics and Astronomy
C. R Newsom (Contributor) - University of Iowa, Physics and Astronomy
Y Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The journal of high energy physics, Vol.2011(3), 136
Publisher: Springer
DOI: 10.1007/JHEP03(2011)136
ISSN: 1126-6708
eISSN: 1029-8479
Language: English
Date published: 03/01/2011
Academic Unit: Physics and Astronomy
Record Identifier: 9984199733102771

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