USQCD       RBC-UKQCD       BNL       Columbia

B-meson physics with domain-wall light quarks and relativistic heavy quarks

Overview     Phase 1     Phase 2

Participants

Norman H. Christ   Taku Izubuchi   Taichi Kawanai   Christoph Lehner   Amarjit Soni   Ruth S. Van de Water   Oliver Witzel (until 09/2014)
(RBC Collaboration)

Jonathan Flynn   Andreas Jüttner  Edwin Lizarazo   Ben Samways   Oliver Witzel (since 10/2014)
(UKQCD Collaboration)

The Project

Our project is designed to compute neutral B-meson mixing and B-meson decay constants and allows at the same time to compute additional B-physics quantities like B -> π l ν form factors and the B*Bπ coupling constant. These computations will help to strengthen constraints on the CKM unitarity triangle and by that support searches for new physics. We use domain-wall light quarks and relativistic heavy quarks simulated using a special interpretation of the Wilson-clover action.
  The project started with the USQCD allocation period 2009/2010 utilizing the 2+1 dynamical flavor domain-wall Iwasaki gauge field configurations generated by the RBC- and UKQCD collaboration with lattice spacings of a ≈ 0.086 fm and 0.11 fm. We completed generating all needed domain-wall light quark propagators on these ensembles and those are immediately available for non-competing project. A frame work for computing matching and O(a) improvement coefficients is in place and likewise most of the numerical work is completed. We are right now analyzing our data and preparing publications. We refer to this part as "Phase 1" of our project.
  For the allocation period 2013/14 we are proposing to extend our B-physics project to the new 2+1 dynamical flavor Möbius-domain-wall ensembles which allow to simulate physical light quarks in a larger volume and at lattice spacing a ≈ 0.086 fm and 0.11 fm. This will help to greatly reduce the uncertainty coming from the chiral part of our combined chiral- and continuum extrapolation which is one of our largerst uncertainties. This extension is named "Phase 2".

Further information is available at Phase 1 (USQCD allocation 2009/2010 - 2012/2013) and Phase 2 (USQCD allocation 2013/2014)

Available Data

24³ and 32³ domain-wall propagators
48³ Möbius domain-wall propagators

Code

This project is performed using
Chroma version 3.38.1
Chroma Tutorial "HackLatt08"
Möbius domain-wall propagators are generated with MDWF and QLUA

Computing Resources

Computations are currently performed on lattice QCD clusters at Fermilab.
To get information on the status of the clusters, please follow the links below.
bc cluster     ds cluster     pi0 cluster

Publications

Jonathan M. Flynn, Patrick Fritsch, Taichi Kawanai, Christoph Lehner, Ben Samways, C.T. Sachrajda, Ruth S. Van de Water, Oliver Witzel:
     "The B*Bpi coupling using relativistic heavy quarks "
      Phys.Rev. D93 (2016) 014510, arXiv:1506.06413 [hep-lat]

Jonathan M. Flynn, Taku Izubuchi, Taichi Kawanai, Christoph Lehner, Amarjit Soni, Ruth S. Van de Water, Oliver Witzel:
     "The B->pi l nu and Bs->K l nu form factors and |Vub| from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks "
      Phys.Rev. D91 (2015) 074510, arXiv:1501.05373 [hep-lat]

Norman H. Christ, Jonathan M. Flynn, Taku Izubuchi, Taichi Kawanai, Christoph Lehner, Amarjit Soni, Ruth S. Van de Water, Oliver Witzel:
     "B-meson decay constants from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks"
      Phys.Rev. D91 (2015) 054502, arXiv:1404.4670 [hep-lat]

Oliver Witzel:
     "Calculating B-meson decay constants using domain-wall light quarks and nonperturbatively tuned relativistic b-quarks"
     PoS Lattice2012 (2013) 377, arXiv:1311.0276 [hep-lat]

Taichi Kawanai, Ruth S. Van de Water, Oliver Witzel:
     "The form factors for B -> pi nu semileptonic decay from 2+1 flavors of domain-wall fermions"
     PoS Lattice2012 (2013) 378, arXiv:1311.1143 [hep-lat]

Ben Samways, Jonathan M. Flynn, Chris T. Sachrajda, Patrick Fritzsch, Taichi Kawanai, Christoph Lehnre, Ruth S. Van de Water, Oliver Witzel:
     "The B ∗ Bπ coupling with relativistic heavy quarks"
     PoS Lattice2012 (2013) 408, arXiv:1311.2251 [hep-lat]

Christoph Lehner:
     "Automated lattice perturbation theory and relativistic heavy quarks in the Columbia formulation."
     PoS Lattice2012 (2012) 126, arXiv:1211.4013 [hep-lat]

Oliver Witzel:
     "Calculating B-meson decay constants using domain-wall light quarks and nonperturbatively tuned relativistic b-quarks"
     PoS Lattice2012 (2012) 103, arXiv:1211.3180 [hep-lat]

Taichi Kawanai, Ruth S. Van de Water, Oliver Witzel:
     "The B -> pi l nu form factor from unquenched lattice QCD with domain-wall light quarks and relativistic b-quarks"
     PoS Lattice2012 (2012) 109, arXiv:1211.0956 [hep-lat]

Oliver Witzel:
     "B-physics with domain-wall light quarks and nonperturbatively tuned relativistic b-quarks"
     to appear in Proceeding CIPANP 2012 ID 205

Yasumichi Aoki , Norman H. Christ , Jonathan M. Flynn, Taku Izubuchi, Christoph Lehner, Min Li, Hao Peng,
Amarjit Soni, Ruth S. Van de Water, Oliver Witzel:
     "Nonperturbative tuning of an improved relativistic heavy-quark action and application to bottom spectroscopy"
     Phys.Rev. D86 (2012) 116003, arXiv:1206.2554 [hep-lat]

Ruth S. Van de Water and Oliver Witzel:
     "B-physics with dynamical domain-wall light quarks and relativistic b-quark"
     PoS Lattice2010 (2010) 318, arXiv:1101.4580 [hep-lat]

Presentations

Oliver Witzel:
     "Beautiful physics on the lattice"
     Theory seminar at the University of Colorado Boulder, Boulder, Colorado, USA

Oliver Witzel:
     "B-physics with domain-wall light quarks and nonperturbatively tuned relativistic b-quarks"
     Talk at CCP 2014, Boston, Massachusetts, USA

Taichi Kawanai:
     "The form factor for B to π semileptonic decay from 2+1 flavors of domain-wall fermions"
     Talk at Lattice 2014, New York City, New York, USA

Oliver Witzel:
     "B-physics with domain-wall light quarks and nonperturbatively tuned relativistic b-quarks"
     Talk at Lattice 2014, New York City, New York, USA

Ben Samways:
     "The B∗B pi coupling with relativistic heavy quarks"
     Talk at Lattice 2013, Mainz, Germany

Christoph Lehner:
     "A new computer algebra system for (lattice) perturbation theory and the RBC/UKQCD heavy quark physics program"
     Talk at Lattice 2013, Mainz, Germany

Taichi Kawanai:
     "The form factor for B to π semileptonic decay from 2+1 flavors of domain-wall fermions"
     Talk at Lattice 2013, Mainz, Germany

Oliver Witzel:
     "B-meson decay constants with domain-wall light quarks and nonperturbatively tuned relativistic b-quarks"
     Talk at Lattice 2013, Mainz, Germany

Christoph Lehner:
     "Automated (L)PT and RHQ in the Columbia formulation "
     Talk at Lattice 2012, Carins, Queensland, Australia

Taichi Kawanai:
     "The B to pi form factor from domain-wall light quarks and relativistic b-quarks"
     Talk at Lattice 2012, Carins, Queensland, Australia

Oliver Witzel:
     "Calculating B-meson decay constants using domain-wall light quarks and nonperturbatively tuned relativistic b-quarks"
     Talk at Lattice 2012, Carins, Queensland, Australia

Oliver Witzel:
     "B-physics with domain-wall light quarks and nonperturbatively tuned relativistic b-quarks"
     Talk at CIPANP 2012, St. Petersburg, Florida, USA

Oliver Witzel:
     B-physics with domain-wall light quarks and relativistic heavy quarks
     New Horizons for Lattice Computations with Chiral Fermions, workshop at BNL, New York, USA

Oliver Witzel:
     B-meson physics with dynamical domain-wall light quarks and nonperturbatively tuned relativisitc b-quarks
     Beautiful Mesons and Baryons on the Lattice, workshop at the ECT*, Trento, Italy

Oliver Witzel:
     "B-meson physics with dynamical domain-wall light quarks and nonperturbatively tuned relativisitc b-quarks"
     Talk at Lattice 2011, Squaw Valley, California, USA

Oliver Witzel:
     B-physics with dynamical domain-wall light quarks and relativistic b-quarks
     Talk at Lattice 2010, Villasimius, Sardinia, Italy


, Phone: +1-617-353 2611. [last updated June 23, 2015]