Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Qiu, Si-Wei"'
Autor:
Bailey, Jon A., Bazavov, A., Bernard, C., Bouchard, C. M., DeTar, C., Du, Daping, El-Khadra, A. X., Foley, J., Freeland, E. D., Gámiz, E., Gottlieb, Steven, Heller, U. M., Jain, R. D., Komijani, J., Kronfeld, A. S., Laiho, J., Levkova, L., Liu, Yuzhi, Mackenzie, P. B., Meurice, Y., Neil, E. T., Qiu, Si-Wei, Simone, J. N., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran
Publikováno v:
Phys. Rev. D 93, 025026 (2016)
We compute the form factors for the $B \to Kl^+l^-$ semileptonic decay process in lattice QCD using gauge-field ensembles with 2+1 flavors of sea quark, generated by the MILC Collaboration. The ensembles span lattice spacings from 0.12 to 0.045 fm an
Externí odkaz:
http://arxiv.org/abs/1509.06235
Autor:
Bailey, Jon A., Bazavov, A., Bernard, C., Bouchard, C. M., DeTar, C., Du, Daping, El-Khadra, A. X., Freeland, E. D., Gamiz, E., Gottlieb, Steven, Heller, U. M., Kronfeld, A. S., Laiho, J., Levkova, L., Liu, Yuzhi, Lunghi, E., Mackenzie, P. B., Meurice, Y., Neil, E., Qiu, Si-Wei, Simone, J. N., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran
Publikováno v:
Phys. Rev. Lett. 115, 152002 (2015)
The rare decay $B\to\pi\ell^+\ell^-$ arises from $b\to d$ flavor-changing neutral currents and could be sensitive to physics beyond the Standard Model. Here, we present the first $ab$-$initio$ QCD calculation of the $B\to\pi$ tensor form factor $f_T$
Externí odkaz:
http://arxiv.org/abs/1507.01618
Autor:
Lattice, Fermilab, Collaborations, MILC, Bailey, Jon A., Bazavov, A., Bernard, C., Bouchard, C. M., DeTar, C., Du, Daping, El-Khadra, A. X., Foley, J., Freeland, E. D., Gámiz, E., Gottlieb, Steven, Heller, U. M., Komijani, J., Kronfeld, A. S., Laiho, J., Levkova, L., Liu, Yuzhi, Mackenzie, P. B., Meurice, Y., Neil, E. T., Qiu, Si-Wei, Simone, J., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran
Publikováno v:
Phys. Rev. D 92, 014024 (2015)
We present a lattice-QCD calculation of the $B\to\pi\ell\nu$ semileptonic form factors and a new determination of the CKM matrix element $|V_{ub}|$. We use the MILC asqtad 2+1-flavor lattice configurations at four lattice spacings and light-quark mas
Externí odkaz:
http://arxiv.org/abs/1503.07839
Autor:
Lattice, Fermilab, Collaborations, MILC, Bailey, Jon A., Bazavov, A., Bernard, C., Bouchard, C. M., DeTar, C., Du, Daping, El-Khadra, A. X., Foley, J., Freeland, E. D., Gámiz, E., Gottlieb, Steven, Heller, U. M., Komijani, J., Kronfeld, A. S., Laiho, J., Levkova, L., Mackenzie, P. B., Neil, E. T., Qiu, Si-Wei, Simone, J., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran
Publikováno v:
Phys. Rev. D 92, 034506 (2015)
We present the first unquenched lattice-QCD calculation of the hadronic form factors for the exclusive decay $\overline{B} \rightarrow D \ell \overline{\nu}$ at nonzero recoil. We carry out numerical simulations on fourteen ensembles of gauge-field c
Externí odkaz:
http://arxiv.org/abs/1503.07237
Autor:
Bailey, Jon A., Bazavov, A., Bernard, C., Bouchard, C. M., DeTar, C., Du, Daping, El-Khadra, A. X., Foley, J., Freeland, E. D., Gamiz, E., Gottlieb, Steven, Heller, U. M., Kronfeld, A. S., Laiho, J., Levkova, L., Mackenzie, P. B., Neil, E. T., Qiu, Si-Wei, Simone, J., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran
Publikováno v:
Phys. Rev. D 89, 114504 (2014)
We compute the zero-recoil form factor for the semileptonic decay $\bar{B}^0\to D^{*+}\ell^-\bar{\nu}$ (and modes related by isospin and charge conjugation) using lattice QCD with three flavors of sea quarks. We use an improved staggered action for t
Externí odkaz:
http://arxiv.org/abs/1403.0635
Autor:
Liu, Yuzhi, Zhou, Ran, Bailey, Jon A., Bazavov, A., Bernard, C., Bouchard, C. M., DeTar, C., Du, Daping, El-Khadra, A. X., Foley, J., Freeland, E. D., Gámiz, E., Gottlieb, Steven, Heller, U. M., Jain, R. D., Kim, Jongjeong, Kronfeld, A. S., Levkova, J. Laiho L., Mackenzie, P. B., Meurice, Y., Mohler, D., Neil, E. T., Oktay, M. B., Qiu, Si-Wei, Simone, J. N., Sugar, R., Toussaint, D., Van de Water, R. S.
Publikováno v:
PoS (LATTICE 2013) 386
We calculate the form factors for the semileptonic decays $B_s\to K\ell\nu$ and $B\to K\ell\ell$ with lattice QCD. We work at several lattice spacings and a range of light quark masses, using the MILC 2+1-flavor asqtad ensembles. We use the Fermilab
Externí odkaz:
http://arxiv.org/abs/1312.3197
Autor:
Bazavov, A., Bernard, C., Bouchard, C., DeTar, C., Du, D., El-Khadra, A. X., Foley, J., Freeland, E. D., Gámiz, E., Gottlieb, Steven, Heller, U. M., Kim, J., Kronfeld, A. S., Laiho, J., Levkova, L., Mackenzie, P. B., Neil, E. T., Oktay, M. B., Qiu, Si-Wei, Simone, J. N., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran
Publikováno v:
Phys. Rev. Lett. 112, 112001 (2014)
We calculate the kaon semileptonic form factor $f_+(0)$ from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC collaboration with $N_f=2+1+1$ flavors of sea quarks, which i
Externí odkaz:
http://arxiv.org/abs/1312.1228
Autor:
Qiu, Si-Wei, DeTar, Carleton, El-Khadra, Aida X., Kronfeld, Andreas S., Laiho, Jack, Van de Water, Ruth S.
We have analyzed the semileptonic decays $B\rightarrow D\ell\nu$ and $B\rightarrow D^*\ell\nu$ on the full suite of MILC (2+1)-flavor asqtad ensembles with lattice spacings as small as 0.045 fm and light-to-strange-quark mass ratios as low as 1/20. W
Externí odkaz:
http://arxiv.org/abs/1312.0155
Autor:
Gámiz, E., Bazavov, A., Bernard, C., Bouchard, C., DeTar, C., Du, D., El-Khadra, A. X., Foley, J., Freeland, E. D., Gottlieb, Steven, Heller, U. M., Kim, J., Kronfeld, A. S., Laiho, J., Levkova, L., Mackenzie, P. B., Neil, E. T., Oktay, M. B., Qiu, Si-Wei, Simone, J. N., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran
Publikováno v:
PoS(LATTICE 2013)395
We present results for the form factor $f_+^{K \pi}(0)$, needed to extract the CKM matrix element $|V_{us}|$ from experimental data on semileptonic $K$ decays, on the HISQ $N_f=2+1+1$ MILC configurations. The HISQ action is also used for the valence
Externí odkaz:
http://arxiv.org/abs/1311.7264
Autor:
Bazavov, A., Bernard, C., Bouchard, C. M., DeTar, C., Du, Daping, El-Khadra, A. X., Foley, J., Freeland, E. D., Gámiz, E., Gottlieb, Steven, Heller, U. M., Kim, Jongjeong, Kronfeld, A. S., Laiho, J., Levkova, L., Mackenzie, P. B., Neil, E. T., Oktay, M. B., Qiu, Si-Wei, Simone, J. N., Sugar, R., Toussaint, D., Van de Water, R. S., Zhou, Ran
Using staggered fermions and twisted boundary conditions, we calculate the K meson semileptonic decay vector form factor at zero momentum transfer. The HISQ formulation is used for the valence quarks, while the sea quarks are simulated with the asqta
Externí odkaz:
http://arxiv.org/abs/1212.4993