790 research outputs found
Hunting for the alpha: , ,
The hypothesis of the smallness of penguin contribution to charmless
strangeless decays allows to determine with high accuracy the
value of angle from the currently available , and decay data.Comment: 9 page
A method for determining CP violating phase
A new way of determining the phases of weak amplitudes in charged decays
based on SU(3) symmetry is proposed. The CP violating phase can now be
determined without the previous difficulty associated with electroweak
penguins.Comment: 9 pages plus one figure, Revte
SU(3) Decomposition of Two-Body B Decay Amplitudes
We present the complete flavor SU(3) decomposition of decay amplitudes for
decays of the triplet (B^+_u, B^0_d, B^0_s) of B mesons nonleptonically into
two pseudoscalar mesons. This analysis holds for arbitrarily broken SU(3) and
can be used to generate amplitude relations when physical arguments permit one
to neglect or relate any of the reduced amplitudes.Comment: 31 pages, revtex, no figure
Weak Coupling Phase from Decays of Charged B Mesons to and
The theory of violation based on phases in weak couplings in the
Cabibbo-Kobayashi-Maskawa (CKM) matrix requires the phase (in a standard convention) to be nonzero. A measurement of
is proposed based on charged meson decay rates to ,
, , and the charge-conjugate states. The corresponding
branching ratios are expected to be of the order of . (submitted to
Physical Review Letters)Comment: LaTeX, 8 pages, 2 figures (not included, available upon request),
TECHNION-PH-94-7, EFI-94-14, UdeM-LPN-TH-94-19
B-> rho pi, rho rho, pi pi: hunting for alpha
We determine the domains of the values of unitarity triangle angle alpha,
allowed by the charmless strangeless B_d (\bar B_d) decays.Comment: 16 pages. Recent Belle results on CP asymmetries in
B_d(\bar{B}_d)-->rho^+ rho^- decays are taken into account. Version to be
published in Yad.Fi
Strong and Weak Phases from Time-Dependent Measurements of
Time-dependence in and \ob(t) \to \pi^+ \pi^- is
utilized to obtain a maximal set of information on strong and weak phases. One
can thereby check theoretical predictions of a small strong phase
between penguin and tree amplitudes. A discrete ambiguity between and may be resolved by comparing the observed
charge-averaged branching ratio predicted for the tree amplitude alone, using
measurements of and factorization, or by direct comparison of
parameters of the Cabibbo-Kobayashi-Maskawa (CKM) matrix with those determined
by other means. It is found that with 150 fb from BaBar and Belle, this
ambiguity will be resolvable if no direct CP violation is found. In the
presence of direct CP violation, the discrete ambiguity between and
becomes less important, vanishing altogether as . The role of measurements involving the lifetime difference between
neutral eigenstates is mentioned briefly.Comment: 14 pages, LaTeX, 5 figures, to be published in Phys. Rev. D. Updated
version with one reference change
Combining CP Asymmetries in Decays
We prove an approximate relation, to leading order in dominant terms, between
CP-violating rate differences in and
. We show how data from these two processes may be
combined in order to enhance the significance of a nonzero result.Comment: 9 pages, latex, no figures, submitted to Phys. Rev. Letters, revise
Determination of CKM phases through rigid polygons of flavor SU(3) amplitudes
Some new methods for the extraction of CKM phases and using
flavor SU(3) symmetry have been suggested through the construction of rigid
polygons in the complex plane with sides equal to the decay amplitudes of B
mesons into two mesons belonging to the light (charmless) pseudoscalar octet.
These rigid polygons incorporate all the possible amplitude triangles and,
being overdetermined, also serve as consistency checks and in estimating the
rates of some decay modes. The same techniques also lead to numerous useful
amplitude triangles when octet-singlet mixing has been taken into account and
nearly physical are used.Comment: A few detailed explanations added, some rearrangement of sections and
a few minor changes in notation. 19 pages, 1 PostScript figure, uses
psfig.st
Determining the Weak Phase From Charged Decays
A quadrangle relation is shown to be satisfied by the amplitudes for , and . By comparison with the
corresponding relation satisfied by decay amplitudes, it is shown that
the relative phases of all the amplitudes can be determined up to discrete
ambiguities. Making use of an SU(3) relation between amplitudes contributing to
the above decays and those contributing to , it is
then shown that one can determine the weak phase , where is the Cabibbo-Kobayashi-Maskawa
matrix describing the charge-changing weak interactions between the quarks
and .Comment: 16 pages, latex, 7 uuencoded figure
Annihilation, Rescattering, and CP Asymmetries in B Meson Decays
A number of meson decays may proceed only through participation of the
spectator quark, whether through amplitudes proportional to or via
rescattering from other less-suppressed amplitudes. An expected hierarchy of
amplitudes in the absence of rescattering will be violated by rescattering
corrections. Such violations could point the way toward channels in which
final-state interactions could be important. Cases in which final state phases
can lead to large CP asymmetries are pointed out.Comment: 9 page
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