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Title: First measurement of the forward-backward asymmetry in bottom-quark pair production at high mass

We measure the particle-level forward-backward production asymmetry in $$\mathrm{b\bar{b}}$$ pairs with masses (m$$\mathrm{b\bar{b}}$$) larger than 150 GeV/c2, using events with hadronic jets and employing jet charge to distinguish b from $$\bar{b}$$. The measurement uses 9.5 fb-1 of $$\mathrm{p\bar{p}}$$ collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of m$$\mathrm{b\bar{b}}$$ is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200 GeV/c2, whereas a model containing a heavier 345 GeV/c2 axigluon is not excluded.
Authors:
 [1]
  1. Univ. of Helsinki (Finland)
Publication Date:
Report Number(s):
FERMILAB-PUB-15-153-E
Journal ID: ISSN 1550-7998; arXiv eprint number arXiv:1504.06888; TRN: US1600855
Grant/Contract Number:
AC02-07CH11359
Type:
Published Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 92; Journal Issue: 3; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CDF Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1212125
Alternate Identifier(s):
OSTI ID: 1212762