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Title: Weak-triplet, color-octet scalars and the CDF dijet excess

We extend the standard model to include a weak-triplet and color-octet scalar. This 'octo-triplet' field consists of three particles, two charged and one neutral, whose masses and renormalizable interactions depend only on two new parameters. The charged octo-triplet decay into a W boson and a gluon is suppressed by a loop factor and an accidental cancellation. Thus, the main decays of the charged octo-triplet may occur through higher-dimensional operators, mediated by a heavy vectorlike fermion, into quark pairs. For an octo-triplet mass below the tb¯ threshold, the decay into Wb b¯ through an off-shell top quark has a width comparable to that into cs¯ or cb¯. Pair production with one octo-triplet decaying to two jets and the other decaying to a W and two soft b jets may explain the dijet-plus-W excess reported by the CDF Collaboration. The same higher-dimensional operators lead to CP violation in Bs-B¯s mixing.
Authors:
 [1] ;  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Theoretical Physics Dept.
  2. Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
Publication Date:
OSTI Identifier:
1012423
Report Number(s):
FERMILAB-PUB--11-141-T
Journal ID: ISSN 1550-7998 ; arXiv eprint number arXiv:1104.2893; TRN: US1102279
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 85; Journal Issue: 7; 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
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS, 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CANCELLATION; DECAY; FERMILAB COLLIDER DETECTOR; GLUONS; INTERMEDIATE BOSONS; PAIR PRODUCTION; QUARKS; SCALARS; STANDARD MODEL; T QUARKS Experiment-HEP, Phenomenology-HEP