Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Annals of the New York Academy of Sciences
578 (1989), S. 0
ISSN:
1749-6632
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Natural Sciences in General
Notes:
In the standard model, the mixing of neutral hadrons (like Ko—Ko and Bo—Bo systems)1,2 takes place through the box-diagrams. For the Ko—Ko case, this was first studied by Gaillard and Lee.3 They calculated the effective Hamiltonian generated by the box-diagrams in the cases when all the external momenta are zero and the quark masses exchanged in the loop were very small compared with mW. Inami and Lim4 extended their calculation to the case of heavy quarks (mq±mW) in the internal loop. The calculation involving nonzero external momentum was done in the case of one heavy and one light external quark.5 However, a general calculation of the box-diagrams when all the external quarks are heavy (MQ1, MQ2± mW) does not exist. The purpose of this paper is twofold: i) to present the calculation of the effective Hamiltonian generated by the box-diagrams when all external quarks are heavy; and ii) to apply this general result to make an estimate for the mixings of neutral hadrons involving heavy quarks, in particular the fourth generation quarks, like (b'b, t't).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1749-6632.1989.tb50630.x
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