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Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ−
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Blake, Thomas and Kreps, Michal (2017) Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ−. Journal of High Energy Physics, 2017 (11). 138. doi:10.1007/JHEP11(2017)138 ISSN 1029-8479.
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Official URL: http://dx.doi.org/10.1007/JHEP11(2017)138
Abstract
Rare b → sℓ+ℓ− flavour-changing-neutral-current processes provide important tests of the Standard Model of particle physics. Angular observables in exclusive b → sℓ+ℓ− processes can be particularly powerful as they allow hadronic uncertainties to be controlled. Amongst the exclusive processes that have been studied by experiments, the decay Λb → Λℓ+ℓ− is unique in that the Λb baryon can be produced polarised. In this paper, we derive an expression for the angular distribution of the Λb → Λℓ+ℓ− decay for the case where the Λb baryon is produced polarised. This extends the number of angular observables in this decay from 10 to 34. Standard Model expectations for the new observables are provided and the sensitivity of the observables is explored under a variety of new physics models. At low-hadronic recoil, four of the new observables have a new short distance dependence that is absent in the unpolarised case. The remaining observables depend on the same short distance contributions as the unpolarised observables, but with different dependence on hadronic form-factors. These relations provide possibilities for novel tests of the SM that could be carried out with the data that will become available at the LHC or a future e+e− collider.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QC Physics | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
Library of Congress Subject Headings (LCSH): | Particles (Nuclear physics), Quarks, Standard model (Nuclear physics), Baryons -- Decay | |||||||||
Journal or Publication Title: | Journal of High Energy Physics | |||||||||
Publisher: | Springer | |||||||||
ISSN: | 1029-8479 | |||||||||
Official Date: | 22 November 2017 | |||||||||
Dates: |
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Volume: | 2017 | |||||||||
Number: | 11 | |||||||||
Article Number: | 138 | |||||||||
DOI: | 10.1007/JHEP11(2017)138 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Date of first compliant deposit: | 7 December 2017 | |||||||||
Date of first compliant Open Access: | 8 December 2017 | |||||||||
RIOXX Funder/Project Grant: |
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