Title

Measurement of the form factor shape for the semileptonic decay Lb->LcMuNu

Date of Award

December 2015

Degree Type

Dissertation

Embargo Date

8-12-2017

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Advisor(s)

Marina Artuso

Subject Categories

Physical Sciences and Mathematics

Abstract

A measurement of the shape of the Isgur-Wise function for the decay Lb->LcMuNu is presented. It is performed with a sample of Lb semileptonic decays in proton-proton collisions with an integrated luminosity of 3 fb-􀀀1. The semileptonic decays Lb->LcMuNuX are identied by

the detection of a muon and a Lc baryon decaying to pKpi. The decay Lb->LcPiPiMuNu is used to isolate the semileptonic decay Lb->LcMuNu􀀀, and determine the spectrum dN/dw(Lb->LcMuNu), where w is the inner product of the 4-velocities of the the initial and nal state heavy baryons. The slope and curvature of the Isgur-Wise function have been determined with a variety of shape assumptions. The measured values are consistent with sum rules bounds. Finally, the shape of the spectrum dN/dq2 has been studied and compared with recent lattice QCD predictions.

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