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Title: 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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1038950
Report Number(s):
FERMILAB-PUB-12-083-E
Journal ID: ISSN 0031--9007; arXiv eprint number arXiv:1203.3894; TRN: US1202061
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Submitted to Phys.Rev.Lett.
Additional Journal Information:
Journal Volume: 108; Journal Issue: 21; Journal ID: ISSN 0031--9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; FERMILAB COLLIDER DETECTOR; LUMINOSITY; PARTICLE DECAY; PARTICLE PRODUCTION; PROTON-ANTIPROTON INTERACTIONS; QUARKS; RESONANCE; STANDARD MODEL; T QUARKS; TRANSVERSE MOMENTUM; Experiment-HEP

Citation Formats

Aaltonen, T, /Helsinki Inst. of Phys., Adelman, J, /Yale U., Alvarez Gonzalez, B, /Oviedo U. /Cantabria Inst. of Phys., Amerio, S, /INFN, Padua, Amidei, D, /Michigan U., Anastassov, A, /Northwestern U. /Fermilab, Annovi, A, /Frascati, Antos, J, /Comenius U., Apollinari, G, /Fermilab, Appel, J A, /Fermilab, Arisawa, T, and /Waseda U. /Dubna, JINR. 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. United States: N. p., 2012. Web. doi:10.1103/PhysRevLett.108.211805.
Aaltonen, T, /Helsinki Inst. of Phys., Adelman, J, /Yale U., Alvarez Gonzalez, B, /Oviedo U. /Cantabria Inst. of Phys., Amerio, S, /INFN, Padua, Amidei, D, /Michigan U., Anastassov, A, /Northwestern U. /Fermilab, Annovi, A, /Frascati, Antos, J, /Comenius U., Apollinari, G, /Fermilab, Appel, J A, /Fermilab, Arisawa, T, & /Waseda U. /Dubna, JINR. 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. United States. https://doi.org/10.1103/PhysRevLett.108.211805
Aaltonen, T, /Helsinki Inst. of Phys., Adelman, J, /Yale U., Alvarez Gonzalez, B, /Oviedo U. /Cantabria Inst. of Phys., Amerio, S, /INFN, Padua, Amidei, D, /Michigan U., Anastassov, A, /Northwestern U. /Fermilab, Annovi, A, /Frascati, Antos, J, /Comenius U., Apollinari, G, /Fermilab, Appel, J A, /Fermilab, Arisawa, T, and /Waseda U. /Dubna, JINR. 2012. "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". United States. https://doi.org/10.1103/PhysRevLett.108.211805. https://www.osti.gov/servlets/purl/1038950.
@article{osti_1038950,
title = {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},
author = {Aaltonen, T and /Helsinki Inst. of Phys. and Adelman, J and /Yale U. and Alvarez Gonzalez, B and /Oviedo U. /Cantabria Inst. of Phys. and Amerio, S and /INFN, Padua and Amidei, D and /Michigan U. and Anastassov, A and /Northwestern U. /Fermilab and Annovi, A and /Frascati and Antos, J and /Comenius U. and Apollinari, G and /Fermilab and Appel, J A and /Fermilab and Arisawa, T and /Waseda U. /Dubna, JINR},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.108.211805},
url = {https://www.osti.gov/biblio/1038950}, journal = {Submitted to Phys.Rev.Lett.},
issn = {0031--9007},
number = 21,
volume = 108,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2012},
month = {Thu Mar 01 00:00:00 EST 2012}
}