Zobrazeno 1 - 10
of 109
pro vyhledávání: '"Davies, Christine. T. H."'
We calculate the decay rates for $\eta_c \to \gamma \gamma$, $J/\psi \to \gamma \eta_c$ and $J/\psi \to \eta_c e^+e^-$ in lattice QCD with $u$, $d$, $s$ and $c$ quarks in the sea for the first time. We improve significantly on previous theory calcula
Externí odkaz:
http://arxiv.org/abs/2305.06231
We compute the complete set of SM and tensor $B_{(s)}\to D_{(s)}^*\ell\bar{\nu}$ semileptonic form factors across the full kinematic range of the decay using second generation MILC $n_f=2+1+1$ HISQ gluon field configurations and HISQ valence quarks,
Externí odkaz:
http://arxiv.org/abs/2304.03137
Autor:
Boyle, Peter A., Chakraborty, Bipasha, Davies, Christine T. H., DeGrand, Thomas, DeTar, Carleton, Del Debbio, Luigi, El-Khadra, Aida X., Erben, Felix, Flynn, Jonathan M., Gámiz, Elvira, Giusti, Davide, Gottlieb, Steven, Hansen, Maxwell T., Heitger, Jochen, Hill, Ryan, Jay, William I., Jüttner, Andreas, Koponen, Jonna, Kronfeld, Andreas, Lehner, Christoph, Lytle, Andrew T., Martinelli, Guido, Meinel, Stefan, Monahan, Christopher J., Neil, Ethan T., Portelli, Antonin, Simone, James N., Simula, Silvano, Sommer, Rainer, Soni, Amarjit, Tsang, J. Tobias, Van de Water, Ruth S., Vaquero, Alejandro, Vittorio, Ludovico, Witzel, Oliver
Lattice quantum chromodynamics has proven to be an indispensable method to determine nonperturbative strong contributions to weak decay processes. In this white paper for the Snowmass community planning process we highlight achievements and future av
Externí odkaz:
http://arxiv.org/abs/2205.15373
We present results of the first lattice QCD calculations of the weak matrix elements for the decays $B_c^+ \to D^0 \ell^+ \nu_{\ell}$, $B_c^+ \to D_s^+ \ell^+ \ell^-$ and $B_c^+ \to D_s^+ \nu \overline{\nu}$. Form factors across the entire physical $
Externí odkaz:
http://arxiv.org/abs/2108.11242
We compute the Standard Model semileptonic vector and axial-vector form factors for $B_s\to D_s^*$ decay across the full $q^2$ range using lattice QCD. We use the Highly Improved Staggered Quark (HISQ) action for all valence quarks, enabling us to no
Externí odkaz:
http://arxiv.org/abs/2105.11433
Publikováno v:
Phys. Rev. Lett. 125, 222003 (2020)
We use our lattice QCD computation of the $B_c\rightarrow J/\psi$ form factors to determine the differential decay rate for the semitauonic decay channel and construct the ratio of branching fractions $R(J/\psi) = \mathcal{B}(B_c^- \rightarrow J/\psi
Externí odkaz:
http://arxiv.org/abs/2007.06956
Publikováno v:
Phys. Rev. D 102, 094518 (2020)
We present the first lattice QCD determination of the $B_c \rightarrow J/\psi$ vector and axial-vector form factors. These will enable experimental information on the rate for $B_c$ semileptonic decays to $J/\psi$ to be converted into a value for $V_
Externí odkaz:
http://arxiv.org/abs/2007.06957
Autor:
Cooper, Laurence J., Davies, Christine T. H., Harrison, Judd, Komijani, Javad, Wingate, Matthew
Publikováno v:
Phys. Rev. D 102, 014513 (2020)
We present results of the first lattice QCD calculations of $B_c \to B_s$ and $B_c \to B_d$ weak matrix elements. Form factors across the entire physical $q^2$ range are then extracted and extrapolated to the physical-continuum limit before combining
Externí odkaz:
http://arxiv.org/abs/2003.00914
Autor:
Davies, Christine T. H., Harrison, Judd, Lepage, G. Peter, Monahan, Christopher J., Shigemitsu, Junko, Wingate, Matthew
Publikováno v:
Phys. Rev. Lett. 124, 082001 (2020)
Predicting the $B_s^0-\bar{B}_s^0$ width difference $\Delta\Gamma_s$ relies on the heavy quark expansion and on hadronic matrix elements of $\Delta B=2$ operators. We present the first lattice QCD results for matrix elements of the dimension-7 operat
Externí odkaz:
http://arxiv.org/abs/1910.00970
Autor:
Davies, Christine T. H., Harrison, Judd, Hughes, Ciaran, Horgan, Ronald R., von Hippel, Georg M., Wingate, Matthew
Publikováno v:
Phys. Rev. D 99, 054502 (2019)
We improve the non-relativistic QCD (NRQCD) action by comparing the dispersion relation to that of the continuum through $\mathcal{O}(p^6)$ in perturbation theory. The one-loop matching coefficients of the $\mathcal{O}(p^4)$ kinetic operators are det
Externí odkaz:
http://arxiv.org/abs/1812.11639