Bottomonium and B results from full lattice QCD

Davies, C. , Colquhoun, B., Galloway, B., Donald, G., Koponen, J., Dowdall, R., Horgan, R., Follana, E., Lepage, G. P. and McNeile, C. (2013) Bottomonium and B results from full lattice QCD. In: 31st International Symposium on Lattice Field Theory LATTICE 2013, Mainz, Germany, 29 Jul – 3 Aug 2013, pp. 1-5.

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We have developed two methods for handling b quarks in lattice QCD. One uses NRQCD (now improved to include radiative corrections) and the other uses Highly Improved Staggered Quarks (HISQ), extrapolating to the b quark from lighter masses and using multiple lattice spacings to control discretisation errors. Comparison of results for the two different methods gives confidence in estimates of lattice QCD systematic errors, since they are very different in these two cases. Here we show results for heavyonium hyperfine splittings and vector current-current correlator moments using HISQ quarks, to add to earlier results testing the heavy HISQ method with pseudoscalar mesons. We also show the form factor for B -> pi l nu decay at zero recoil using NRQCD b quarks and u/d quarks with physical masses. This allows us to test the soft pion theorem relation (f_0(q2max)=f_B/fπ) accurately and we find good agreement as M_pi -> 0.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Galloway, Mr Ben and Follana, Dr Eduardo and McNeile, Dr Craig and Colquhoun, Dr Brian and Dowdall, Dr Rachel and Koponen, Dr Jonna and Davies, Professor Christine and Donald, Dr Gordon
Authors: Davies, C., Colquhoun, B., Galloway, B., Donald, G., Koponen, J., Dowdall, R., Horgan, R., Follana, E., Lepage, G. P., and McNeile, C.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Copyright Holders:Copyright © 2013 The Authors
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
573721Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience & Technologies Facilities Council (STFC)ST/J000442/1P&A - PHYSICS & ASTRONOMY