Search for a heavy particle decaying to a top quark and a light quark in pp ¯ collisions at âs=1.96 TeV.
Phys Rev Lett
; 108(21): 211805, 2012 May 25.
Article
in En
| MEDLINE
| ID: mdl-23003243
ABSTRACT
We present a search for a new heavy particle X produced in association with a top quark, pp[over ¯]ât(Xât[over ¯]q) or pp[over ¯]ât[over ¯](X[over ¯]âtq[over ¯]), 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 t[over ¯]+j or t+j resonance in tt[over ¯]+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(-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 (pp[over ¯]âXt or X[over ¯]t[over ¯]) at 95% confidence level from 0.61 pb to 0.02 pb for X masses ranging from 200 GeV/c(2) to 800 GeV/c(2), respectively.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2012
Document type:
Article
Affiliation country:
Finlandia