Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons

Details Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons

1994-07-15

arxiv.org/abs/hep-ph/9407303v2

Phys.Rev.D51:1199-1214,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages + 3 figures (not included), CLNS 94/1278, IP-ASTP-04-94. [Main changes in this revised version: (i) Sect 2 and subsec

Scientific paper

10.1103/PhysRevD.51.1199

Motivated by the observation of the decay $\bar{B}\to \bar{K}^*\gamma$ by CLEO, we have systematically analyzed the two-body weak radiative decays of bottom and charmed hadrons. There exist two types of weak radiative decays: One proceeds through the short-distance $b\to s\gamma$ transition and the other occurs through $W$-exchange accompanied by a photon emission. Effective Lagrangians are derived for the $W$-exchange bremsstrahlung processes at the quark level and then applied to various weak electromagnetic decays of heavy hadrons. Predictions for the branching ratios of $\bar{B}^0\to D^{*0} \gamma,~\Lambda_b^0\to\Sigma_c^0\gamma,~\Xi_b^0\to \Xi_c^0\gamma$ and $\Xi_b^0\to\xip_c^0\gamma$ are given. In particular, we found ${\cal B}(\bar{B}^0 \to D^{*0}\gamma)\approx 0.9\times 10^{-6}$. Order of magnitude estimates for the weak radiative decays of charmed hadrons: $~D^0\to \bar{K}^{*0}\gamma,~\Lambda_c^+\to\Sigma^+\gamma$ and $\Xi_c^0\to\Xi^0\gamma$ are also presented. Within this approach, the decay asymmetry for antitriplet to antitriplet heavy baryon weak radiative transitions is uniquely predicted by heavy quark symmetry. The electromagnetic penguin contribution to $\Lambda_b^0\to\Lambda\gamma$ is estimated by two different methods and its branching ratio is found to be of order $1\times 10^{-5}$. We conclude that weak radiative decays of bottom hadrons are dominated by the short-distance $b\to s\gamma$ mechanism.

Affiliated with

Also associated with

No associations

Rating

Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-604515