https://doi.org/10.1051/epjconf/202431400007
Inclusive rare Λb decays to photon
Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Via Orabona 4, I-70126 Bari, Italy
* e-mail: francesco.loparco1@ba.infn.it
Published online: 10 December 2024
Inclusive Hb → Xs γ decays, with Hb a beauty baryon, are treated exploiting an expansion up to the third order in the inverse of the b quark mass mb and to LO in αs, keeping the dependence on the hadron spin. Double distribution d2Γ/dy d cos θ P is computed for polarized baryons, with y = 2 Eγ/mb, Eγ the photon energy and θP the angle between the baryon spin vector and the photon momentum in the Hb rest-frame. Modifications to the photon polarization asymmetry can probe effects of physics beyond the Standard Model. A systematic method to treat the singular terms in the photon energy spectrum obtained by the OPE is proposed.
© The Authors, published by EDP Sciences, 2024
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