Eur. Phys. J. C 18, 681-709
DOI: 10.1007/s100520100562
Charmless decays
, and the effects of new
strong and electroweak penguins in topcolor-assisted technicolor model
Z.J. Xiao1, 2, 3, W.J. Li2, L.B. Guo1, 4 and G.R. Lu1, 2
1 CCAST(World Laboratory) P.O. Box 8730, Beijing 100080, P.R. China
2 Department of Physics, Henan Normal University, Xinxiang 453002, P.R. China
3 Department of Physics, Peking University, Beijing 100871, P.R. China
4 Department of Physics, Wuhan University, Wuhan 430000, P.R. China
(Received: 18 August 2000 / Revised version: 22 October 2000 / Published online: 5 February 2001 -© Springer-Verlag 2001)
Abstract
Based on the low energy effective Hamiltonian with generalized
factorization, we
calculate the new physics contributions to the branching ratios
and CP-violating asymmetries of the two-body charmless hadronic
decays
from the new strong and electroweak penguin
diagrams
in the topcolor-assisted technicolor (TC2) model.
The top-pion penguins dominate the new physics corrections, and
both new
gluonic and electroweak penguins contribute effectively to most
decay modes.
For tree-dominated decay modes
, etc.
the new
physics corrections are less than
.
For decays
,
,
,
,
,
, etc.
the new physics enhancements can be rather large (from
to
) and are insensitive to the variations
of
Nceff, k2,
and
within
reasonable ranges.
For the decays
,
,
and
,
is strongly
Nceff dependent:
varying from
to
in the range of
Nceff=2-
.
The new physics corrections to the CP-violating asymmetries
vary greatly for different B decay channels. For five measured
CP
asymmetries of the
decays,
is only about
and will be masked
by
large theoretical uncertainties. The new physics enhancements
to interesting
decays are significant
in size
(
), insensitive to the variations of the
input parameters
and hence
lead to a plausible interpretation for the unexpectedly large
decay rates.
The TC2 model predictions for branching ratios and CP-violating
asymmteries
of all fifty-seven
decay modes are consistent
with the available data within one or two standard deviations.
© Società Italiana di Fisica, Springer-Verlag 2001