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Title: Experimental Discrimination between Charge 2e/3 Top Quark and Charge 4e/3 Exotic Quark Production Scenarios

Abstract

We present the first experimental discrimination between the 2e/3 and 4e/3 top quark electric charge scenarios, using top quark pairs (tt) produced in pp collisions at {radical}(s)=1.96 TeV by the Fermilab Tevatron Collider. We use 370 pb{sup -1} of data collected by the D0 experiment and select events with at least one high transverse momentum electron or muon, high transverse energy imbalance, and four or more jets. We discriminate between b- and b-quark jets by using the charge and momenta of tracks within the jet cones. The data are consistent with the expected electric charge, vertical bar q vertical bar=2e/3. We exclude, at the 92% C.L., that the sample is solely due to the production of exotic quark pairs QQ with vertical bar q vertical bar=4e/3. We place an upper limit on the fraction of QQ pairs {rho}<0.80 at the 90% C.L.

Authors:
; ; ; ; ; ; ;  [1]; ; ; ; ; ; ; ; ;  [2]; ; ;  [3]
  1. Joint Institute for Nuclear Research, Dubna, Russia (Russian Federation)
  2. University of Oklahoma, Norman, Oklahoma 73019 (United States)
  3. Michigan State University, East Lansing, Michigan 48824 (United States) (and others)
Publication Date:
OSTI Identifier:
20861634
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevLett.98.041801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B QUARKS; ELECTRIC CHARGES; ELECTRONS; FERMILAB TEVATRON; MUONS; PARTICLE PRODUCTION; PARTICLE TRACKS; PROTON-PROTON INTERACTIONS; T QUARKS; TEV RANGE 01-10; TRANSVERSE ENERGY; TRANSVERSE MOMENTUM

Citation Formats

Abazov, V. M., Alexeev, G. D., Kalinin, A. M., Kharzheev, Y. M., Malyshev, V. L., Tokmenin, V. V., Vertogradov, L. S., Yatsunenko, Y. A., Abbott, B., Gutierrez, P., Hall, I., Jain, S., Kopal, M., Pompos, A., Severini, H., Skubic, P., Strauss, M., Abolins, M., Benitez, J. A., and Brock, R. Experimental Discrimination between Charge 2e/3 Top Quark and Charge 4e/3 Exotic Quark Production Scenarios. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.041801.
Abazov, V. M., Alexeev, G. D., Kalinin, A. M., Kharzheev, Y. M., Malyshev, V. L., Tokmenin, V. V., Vertogradov, L. S., Yatsunenko, Y. A., Abbott, B., Gutierrez, P., Hall, I., Jain, S., Kopal, M., Pompos, A., Severini, H., Skubic, P., Strauss, M., Abolins, M., Benitez, J. A., & Brock, R. Experimental Discrimination between Charge 2e/3 Top Quark and Charge 4e/3 Exotic Quark Production Scenarios. United States. doi:10.1103/PHYSREVLETT.98.041801.
Abazov, V. M., Alexeev, G. D., Kalinin, A. M., Kharzheev, Y. M., Malyshev, V. L., Tokmenin, V. V., Vertogradov, L. S., Yatsunenko, Y. A., Abbott, B., Gutierrez, P., Hall, I., Jain, S., Kopal, M., Pompos, A., Severini, H., Skubic, P., Strauss, M., Abolins, M., Benitez, J. A., and Brock, R. Fri . "Experimental Discrimination between Charge 2e/3 Top Quark and Charge 4e/3 Exotic Quark Production Scenarios". United States. doi:10.1103/PHYSREVLETT.98.041801.
@article{osti_20861634,
title = {Experimental Discrimination between Charge 2e/3 Top Quark and Charge 4e/3 Exotic Quark Production Scenarios},
author = {Abazov, V. M. and Alexeev, G. D. and Kalinin, A. M. and Kharzheev, Y. M. and Malyshev, V. L. and Tokmenin, V. V. and Vertogradov, L. S. and Yatsunenko, Y. A. and Abbott, B. and Gutierrez, P. and Hall, I. and Jain, S. and Kopal, M. and Pompos, A. and Severini, H. and Skubic, P. and Strauss, M. and Abolins, M. and Benitez, J. A. and Brock, R.},
abstractNote = {We present the first experimental discrimination between the 2e/3 and 4e/3 top quark electric charge scenarios, using top quark pairs (tt) produced in pp collisions at {radical}(s)=1.96 TeV by the Fermilab Tevatron Collider. We use 370 pb{sup -1} of data collected by the D0 experiment and select events with at least one high transverse momentum electron or muon, high transverse energy imbalance, and four or more jets. We discriminate between b- and b-quark jets by using the charge and momenta of tracks within the jet cones. The data are consistent with the expected electric charge, vertical bar q vertical bar=2e/3. We exclude, at the 92% C.L., that the sample is solely due to the production of exotic quark pairs QQ with vertical bar q vertical bar=4e/3. We place an upper limit on the fraction of QQ pairs {rho}<0.80 at the 90% C.L.},
doi = {10.1103/PHYSREVLETT.98.041801},
journal = {Physical Review Letters},
number = 4,
volume = 98,
place = {United States},
year = {Fri Jan 26 00:00:00 EST 2007},
month = {Fri Jan 26 00:00:00 EST 2007}
}