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Physical Review D

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New $C P$ -odd observable in $H \to t \bar{t}$

G. Valencia¹ and Yili Wang^1,2,*

¹Department of Physics, Iowa State University, Ames, Iowa 50011, USA
²Department of Physics, University of Oklahoma, Norman, Oklahoma 73019, USA

^*Electronic address: valencia@iastate.edu: yiliwa@iastate.edu

Phys. Rev. D 73, 053009 – Published 20 March, 2006

DOI: https://doi.org/10.1103/PhysRevD.73.053009

Abstract

We study a $C P$ -violating triple product correlation that occurs in the decay of a neutral Higgs boson into $t \bar{t}$ pairs when the Higgs boson does not have a definite $C P$ nature. We consider the $H \to t \bar{t}$ decay channel as well as the gluon fusion process $g g \to H \to t \bar{t}$ . The asymmetry in Higgs decay, normalized to the $H \to t \bar{t}$ width, can reach the 6% percent level. In the gluon fusion process the corresponding normalized asymmetry is smaller by an order of magnitude. We present a crude estimate of this observable at the LHC.

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