The static-light meson spectrum from twisted mass lattice QCD

Abstract

We compute the static-light meson spectrum with N f = 2 flavours of sea quarks using Wilson twisted mass lattice QCD. We consider five different values for the light quark mass corresponding to 300 MeV < ∼ m PS < ∼ 600 MeV and we present results for angular momentum j = 1/2, j = 3/2 and j = 5/2 and for parity P = + and P = −. We extrapolate our results to physical quark masses and make predictions regarding the spectrum of B and B s mesons.

Light hadrons from lattice QCD with light (u, d), strange and charm dynamical quarks

“…This approach is by now well established, with many physical results obtained with two light degenerate twisted mass flavours (N f = 2) by our European Twisted Mass (ETM) Collaboration, see refs. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For a review see ref.…”

Lattice QCD determination of m b , f B and f Bs with twisted mass Wilson fermions

“…We use the same setup as for the recent ETMC study of the static-light meson spectrum [33,34]. Technical details regarding e.g.…”

“…In order to check the stability of the fitting method to extract the above matrix elements, we have performed, as in [33], the computations with different parameters: number of states to be fitted in correlators, fitting time ranges, operator content of the correlation matrices. We have obtained results that are consistent within statistical errors.…”

First results of ETMC simulations with Nf=2+1+1 twisted mass fermions

“…we do not determine all low lying states below the D. To this end we apply smearing techniques (cf. [16], where the same setup was used) to construct highly optimized trial states with large overlap to the K-and Dmeson, and make certain assumptions about these trial states, which will be motivated and detailed in an upcoming publication. To extract the D-meson mass, we applied three different methods: (1) solving a generalized eigenvalue problem, (2) performing a multi-exponential fit and (3) rotating the twisted basis correlators back to the physical basis (in order to do this we need to compute the light and heavy twist angle and a ratio of the appropriate renormalization constants).…”