Photon helicity in Lambda_b --> p K gamma decays

Abstract

Radiative decays of polarized Lambda_b baryons represent an attractive possibility to measure the helicity of the photon emitted in the b --> s gamma quark transition and thus to subject the Standard Model to a stringent test at existing and future hadron colliders. The most abundant mode, Lambda(1116) gamma, is experimentally very challenging because of the long decay length of the Lambda(1116). We show that the experimentally more accessible Lambda_b --> p K gamma decays proceeding via Lambda resonances may be used to extract the photon helicity for sufficient Lambda_b polarization, if the resonance spin does not exceed 3/2. A direct comparison of the potential of such resonance decays to assess the photon polarization at a hadron collider with respect to the decay to Lambda(1116) is given.

elsart, 17 pages, 4 figures; corrected sensitivity estimates

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Cited by in corpus (21)

• Rare $B$ Decays as Tests of the Standard Model
• Rare Decays of Λ_b->Λ+ γand Λ_b ->Λ+ l^{+} l^{-} in the Light-cone Sum Rules
• Measurements of the Lambda_b0 -> J/psi Lambda decay amplitudes and the Lambda_b0 polarisation in pp collisions at sqrt(s) = 7 TeV
• New Physics at a Super Flavor Factory
• Time-dependent CP Asymmetry in B->K* gamma as a (Quasi) Null Test of the Standard Model
• Photon polarization from helicity suppression in radiative decays of polarized Lambda_b to spin-3/2 baryons
• Flavor Anomalies in Heavy Quark Decays
• Future prospects for the determination of the Wilson coefficient $C_{7\gamma }^{\prime }$
• Angular distribution of polarised ${\Lambda }_b$ baryons decaying to $\Lambda {\ell }^{+}{\ell }^{-}$
• ${\Lambda }_c\to {\Lambda }^{\ast }(1520)$ form factors from lattice QCD and improved analysis of the ${\Lambda }_b\to {\Lambda }^{\ast }(1520)$ and ${\Lambda }_b\to {\Lambda }_c^{\ast }(2595,2625)$ form factors
• ${\Lambda }_b\to {\Lambda }^{\ast }(1520){\ell }^{+}{\ell }^{-}$ form factors from lattice QCD
• Endpoint Relations for Baryons
• Rare b hadron decays at the LHC
• Angular analysis of the rare decay ${\Lambda }_b\to \Lambda (1520)(\to NK){\ell }^{+}{\ell }^{-}$
• Measurement of the photon polarization in ${\Lambda }_b\to \Lambda \gamma$ decays
• CP violation in multibody decays of beauty baryons
• Note on new interesting baryon channels to measure the photon polarization in b -> s gamma
• Rare radiative decays of charm baryons
• On the photon polarization in radiative B -> phi K gamma decay
• Di-vector boson production in association with a Higgs boson at hadron colliders
• Recent progress in decays of $b$ and $c$ hadrons