Domain Wall Charm Physics with Physical Pion Masses: Decay constants, bag and $ξ$ parameters

Boyle, Peter; Debbio, Luigi Del; Khamseh, Ava; Jüttner, Andreas; Sanfilippo, Francesco; Tsang, Justus Tobias

doi:10.48550/arxiv.1511.09328

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Semi-leptonic Decays With B → C Transitions1

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2016

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“…This avoids tuning the three parameters of the RHQ action and allows us to use a renormalization procedure similar to that in our B → π ν calculation. We therefore simulate charm based on the recent work featuring optimized Möbius domain-wall fermions [15,[47][48][49] i.e. we use domain-wall fermions with the Möbius kernel and choose the following parameters: without link-smearing the gauge field [49,50].…”

Section: Semi-leptonic Decays With B → C Transitionsmentioning

confidence: 99%

Form factors for semi-leptonic $B$ decays

Flynn¹,

Izubuchi²,

Jüttner³

et al. 2016

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Semi-leptonic B decays provide promising channels to test the Standard Model, search for signs of new physics, or determine fundamental parameters like CKM matrix elements. We present an update on our calculation of short distance contributions to GIM suppressed rare B decays focusing in particular on B s → φ + − decays. Furthermore we show first results for our calculation of B (s) → D ( * ) (s) ν semi-leptonic decays involving b → c transitions. Our calculations are based on RBC-UKQCD's 2+1 flavor domain-wall fermion and Iwasaki gauge field configurations featuring three lattice spacings in the range 1.73 GeV ≤ a −1 ≤ 2.77 GeV and pion masses down to the physical value. We calculate the form factors by simulating b-quarks using the relativistic heavy quark action, create light u/d and s quarks with standard domain-wall kernel, and use optimised Möbius domain-wall fermions for charm quarks.

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