Visualisation Room (201)
Lloyd Building
Trinity College Dublin
Time: 2:00 pm
| Date | Speaker | Institute | Title |
| 15 Nov 2011 | Nicolas Garron | University of Edinburgh | b-physics from lattice heavy quark effective theory
View abstract Heavy quark effective theory (HQET) is a natural framework to study hadrons with a b-quark. Following the method proposed and developed by the Alpha collaboration, HQET can be implemented non-perturbatively beyond the static approximation (including corrections in inverse of the heavy quark mass). I will show how this method can be applied to the computation of physical quantities like the b-quark mass, the heavy-light decay constant, or the mass splitting mB*-mB. Finally I will present some results obtained with nf=2 flavours of dynamical quarks. |
| 29 Nov 2011 | Rachel Dowdall | University of Glasgow |
The Upsilon spectrum and the determination of the lattice spacing from
lattice QCD including charm quarks in the sea
View abstract We give results for the Upsilon spectrum from lattice QCD using an improved version of the NRQCD action for b quarks which includes radiative corrections to kinetic terms at O(v^4 ) in the velocity expansion. We also include for the first time the effect of up, down, strange and charm quarks in the sea using 'second generation' gluon field configurations from the MILC collaboration. Using the Upsilon 2S-1S splitting to determine the lattice spacing, we are able to obtain the 1P-1S splitting to 1.4% and the Upsilon 3S-1S splitting to 2.4%. Our improved result for M(Upsilon)-M(eta_b) is 69(9) and we predict M(Upsilon(2S)-M(eta_b(2S))=35(3) MeV. We also calculate pi, K and eta_s correlators using the Highly Improved Staggered Quark action and perform a chiral and continuum extrapolation to give values for M(eta_s) and f(eta_s) that allow us to tune the strange quark mass as well as providing an independent and consistent determination of the lattice spacing. Combining the NRQCD and HISQ analyses gives mb/ms=54.6(2.5) and a value for the heavy qiark potential parameter of r_1=0.3208(26)fm. |
| TBD | Assumpta Parreno | University of Barcelona |
View abstract |
| 21 February 2012 | Paula Perez Rubio | University of Regensburg |
View abstract |
| 20 March 2012 | Pietro Giudice | Swansea University |
View abstract |
| 10 March 2012 | Gergely Enrodi | University of Regensburg |
View abstract |