Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.768313
Title: First observation of the charmless beauty decay Λ⁰/b→pKη'
Author: Williams, Timothy
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2018
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Abstract:
A search is performed for the decay $$\lambda\frac{0}{b}$$→pKη' using pp collision data collected with the LHCb detector at centre-of-mass energies of $$\sqrt{s}$$ = 7TeV and $$\sqrt{s}$$ = 8TeV, corresponding to an integrated luminosity of 3 fb$$^-$$$$^1$$. The search is performed in two decay channels; the η' is reconstructed through the decays η'→$$\pi^+\pi^-\gamma$$ and η'→$$\pi^+\pi^-\eta$$. In the η'→$$\pi^+\pi^-\gamma$$ decay channel 117 ± 15(stat.) ± 10(sys.) signal events are observed and 45 ± 8(stat.) ± 2(sys.) signal events are observed in the η'→$$\pi^+\pi^-\eta$$ decay channel. The combined statistical significance of these signals is 12.0σ, therefore this is the first observation of the decay $$\lambda\frac{0}{b}$$→pKη' . The branching fraction of the decay $$\lambda\frac{0}{b}$$→pKη' is measured relative to the decay B$$^+$$→K$$^+$$η'. The ratio of branching fractions is measured to be $$\frac{\beta(\lambda\frac{0}{b}→pKη')}{\beta(B^+→K^+η'}$$= 0.120 ± 0.013(stat.) ± 0.013(sys.). Using the world average value for the branching fraction of the decay B$$^+$$→K$$^+$$η', the branching fraction of $$\lambda\frac{0}{b}$$→pKη' is measured to be, $$\beta$$$$(\lambda\frac{0}{b}→pKη')$$ = 8.48 ± 0.88(stat.) ± 0.97(sys.) x 10$$^-$$$$^6$$ . This is the first observation of a b-baryon decaying to an η.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.768313  DOI: Not available
Keywords: QC Physics
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