We measure the particle-level forward-backward production asymmetry in bb¯ pairs with masses (mbb¯) larger than 150  GeV/c2, using events with hadronic jets and employing jet charge to distinguish b from b¯. The measurement uses 9.5  fb−1 of pp¯ collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of mbb¯ is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200  GeV/c2, whereas a model containing a heavier 345  GeV/c2 axigluon is not excluded.

Aaltonen, T., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., et al. (2015). First measurement of the forward-backward asymmetry in bottom-quark pair production at high mass. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 92(3), 032006-1-032006-11 [10.1103/PhysRevD.92.032006].

First measurement of the forward-backward asymmetry in bottom-quark pair production at high mass

BRIGLIADORI, LUCA;CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MOGGI, NICCOLO';MUSSINI, MANUEL;ZUCCHELLI, STEFANO
2015

Abstract

We measure the particle-level forward-backward production asymmetry in bb¯ pairs with masses (mbb¯) larger than 150  GeV/c2, using events with hadronic jets and employing jet charge to distinguish b from b¯. The measurement uses 9.5  fb−1 of pp¯ collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of mbb¯ is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200  GeV/c2, whereas a model containing a heavier 345  GeV/c2 axigluon is not excluded.
2015
Aaltonen, T., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., et al. (2015). First measurement of the forward-backward asymmetry in bottom-quark pair production at high mass. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 92(3), 032006-1-032006-11 [10.1103/PhysRevD.92.032006].
Aaltonen, T.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Appel, J.A.; Arisawa, T.; Artikov, A.; Asaadi, J.; Ashman...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537078
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