Angular Distribution and Polarization of Photons in the Inclusive Decay ${\Lambda }_b\to X_s\gamma$

Abstract

We study the angular distribution of photons produced in the inclusive decay of a polarized ${\Lambda }_b$, ${\Lambda }_b\to X_s\gamma$, using the technique of Heavy Quark Effective Theory. Finite non-perturbative corrections are obtained relative to the free quark decay $b\to s\gamma$. These corrections affect significantly the intensity and polarization of photons emitted at small angles relative to the ${\Lambda }_b$ spin direction.

10 pages, LaTeX, uses epsf, 2 figures appended as uuencoded, compressed eps tar-files

References in corpus (8)

• Heavy Quark Symmetry
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Cited by in corpus (19)

• ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ form factors, differential branching fraction, and angular observables from lattice QCD with relativistic $b$ quarks
• Flavour Changing Neutral Current Decays of Heavy Baryons: The Case ${\Lambda }_b\to \Lambda \gamma$
• New Physics at a Super Flavor Factory
• Lambda_b -> Lambda l+ l- form factors and differential branching fraction from lattice QCD
• Photon polarization from helicity suppression in radiative decays of polarized Lambda_b to spin-3/2 baryons
• Angular distribution of polarised ${\Lambda }_b$ baryons decaying to $\Lambda {\ell }^{+}{\ell }^{-}$
• (Lambda_b -> Lambda l^+ l^-) decay in universal extra dimensions
• First observation of the radiative decay ${\Lambda }_b^0\to \Lambda \gamma$
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• ${\Lambda }_b\to {\Lambda }^{\ast }(1520){\ell }^{+}{\ell }^{-}$ form factors from lattice QCD
• T violation in (Lambda_b -> Lambda l^+ l^-) decay beyond standard model
• Polarization effects in exclusive semileptonic (Lambda_b -> Lambda l^+ l^-) decay
• Photon helicity in Lambda_b --> p K gamma decays
• Measurement of the photon polarization in ${\Lambda }_b\to \Lambda \gamma$ decays
• CP violation in multibody decays of beauty baryons
• Unparticle physics effects in (Lambda_b -> Lambda + missing energy) processes
• Note on new interesting baryon channels to measure the photon polarization in b -> s gamma
• Radiative $b$-baryon decays to measure the photon and $b$-baryon polarization
• Polarized Λ_b \to X_c τνin the SM and THDM