Search for a heavy particle decaying to a top quark and a light quark in $$p\bar{p}$$ collisions at $$\sqrt{s}=1.96$$ TeV

Journal Article · Thu Mar 01 04:00:00 EST 2012 · Submitted to Phys.Rev.Lett.

DOI:https://doi.org/10.1103/PhysRevLett.108.211805· OSTI ID:1038950

Aaltonen, T; Adelman, J; Alvarez Gonzalez, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, J A; Arisawa, T

We present a search for a new heavy particle M produced in association with a top quark, p{bar p} {yields} t(M {yields} {bar t}q) or p{bar p} {yields} {bar t}({bar M} {yields} t{bar q}), where q stands for up quarks and down quarks. Such a particle may explain the recent anomalous measurements of top-quark forward-backward asymmetry. If the light-flavor quark (q) is reconstructed as a jet (j), this gives a {bar t}+j or t+j resonance in t{bar t}+jet events, a previously unexplored experimental signature. In a sample of events with exactly one lepton, missing transverse momentum and at least five jets, corresponding to an integrated luminosity of 8.7 fb{sup -1} collected by the CDF II detector, we find the data to be consistent with the standard model. We set cross-section upper limits on the production (p{bar p} {yields} Mt or {bar M} {bar t}) at 95% confidence level from 0.61 pb to 0.02 pb for M masses ranging from 200 GeV/c{sup 2} to 800 GeV/c{sup 2}, respectively.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: DOE Office of Science
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1038950
• Report Number(s): FERMILAB-PUB-12-083-E; arXiv eprint number arXiv:1203.3894
• Journal Information: Submitted to Phys.Rev.Lett., Journal Name: Submitted to Phys.Rev.Lett. Journal Issue: 21 Vol. 108; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
Experiment-HEP
FERMILAB COLLIDER DETECTOR
LUMINOSITY
PARTICLE DECAY
PARTICLE PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
QUARKS
RESONANCE
STANDARD MODEL
T QUARKS
TRANSVERSE MOMENTUM