Radiative \(b\)-baryon decays to measure the photon and \(b\)-baryon polarization

The radiative decays of \(b\)-baryons facilitate the direct measurement of photon helicity in \(b\to s\gamma\) transitions thus serving as an important test of physics beyond the Standard Model. In this paper we analyze the complete angular distribution of ground state \(b\)-baryon (\(\Lambda_{b}^{0...

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Bibliographic Details
Published in:arXiv.org 2019-02
Main Authors: Miguel García Martín, Luis, Jashal, Brij, Fernando Martínez Vidal, Oyanguren, Arantza, Shibasis Roy, Sain, Ria, Sinha, Rahul
Format: Article
Language:English
Subjects:
Angular distribution
Baryons
Decay
Helicity
Large Hadron Collider
Polarization
Quarks
Standard model (particle physics)
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Summary:The radiative decays of \(b\)-baryons facilitate the direct measurement of photon helicity in \(b\to s\gamma\) transitions thus serving as an important test of physics beyond the Standard Model. In this paper we analyze the complete angular distribution of ground state \(b\)-baryon (\(\Lambda_{b}^{0}\) and \(\Xi_{b}^{-}\)) radiative decays to multibody final states assuming an initially polarized \(b\)-baryon sample. Our sensitivity study suggests that the photon polarization asymmetry can be extracted to a good accuracy along with a simultaneous measurement of the initial \(b\)-baryon polarization. With higher yields of \(b\)-baryons, achievable in subsequent runs of the Large Hadron Collider (LHC), we find that the photon polarization measurement can play a pivotal role in constraining different new physics scenarios.
ISSN:2331-8422
DOI:10.48550/arxiv.1902.04870