Study of FCNC mediated Z boson effect in the semileptonic rare baryonic decays Lambda(b) ---> Lambda l+ l- - INSPIRE

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Study of FCNC mediated Z boson effect in the semileptonic rare baryonic decays Lambda(b) ---> Lambda l+ l-

A.K. Giri
(
- Taiwan, Natl. Tsing Hua U.
)
,
R. Mohanta
(
- Hyderabad U.
)

Oct, 2005

17 pages

Published in:

Eur.Phys.J.C 45 (2006) 151-158

e-Print:

hep-ph/0510171 [hep-ph]

DOI:

10.1140/epjc/s2005-02407-6

View in:

ADS Abstract Service

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Abstract:

We study the effect of the FCNC mediated

Z

boson in the rare semileptonic baryonic decays

\Lambda_b \to \Lambda l^+ l^-

. We consider the model where the standard model fermion sector is extended by an extra vector like down quark, as a consequence of which it allows CP violating Z mediated flavor changing neutral current at the tree level. We find that due to this non-universal

Zbs

coupling, branching ratios of the rare semileptonic

\Lambda_b

decays are enhanced reasonably from their corresponding standard model values and the zero point of the forward backward asymmetry for

\Lambda_b \to \Lambda \mu^+ \mu^-

is shifted to the left.

11.30.Hv
13.30.Ce
12.60.-i
Lambda/b0: rare decay
Lambda/b0: semileptonic decay
lepton: pair production
neutral current: flavor changing
Z0
new interaction
effective Hamiltonian

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Figures(0)

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