Eur. Phys. J. C (2007) 51: 163-168
https://doi.org/10.1140/epjc/s10052-007-0290-y

Regular Article - Theoretical Physics

Probing R-parity violating interactions from top-quark polarization at LHC

¹ Department of Physics, Henan Normal University, Xinxiang, 453007, P.R. China
² CCAST (World Laboratory), P.O. Box 8730, Beijing, 100080, P.R. China
³ Institute of Theoretical Physics, Academia Sinica, P.O. Box 2735, Beijing, 100080, P.R. China

^* e-mail: jmyang@itp.ac.cn

Received: 29 November 2006
Revised: 24 February 2007
Published online: 1 June 2007

Abstract

In the minimal supersymmetric standard model the R-parity violating interactions can induce anomalous top pair productions at the LHC through the t-channel process d_Rd̄_R→t_Lt̄_L by exchanging a slepton or by the u-channel process d_Rd̄_R→t_Rt̄_R exchanging a squark. Such top pair productions with a certain chirality cause top-quark polarization in the top pair events. We found that at the LHC, due to the large statistics, the statistical significance of the polarization observable, and thus the probing ability for the corresponding R-parity violating couplings, is much higher than at the Tevatron upgrade.