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B-physics from Nf=2 tmQCD: the Standard Model and beyond

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B-physics from Nf=2 tmQCD: the Standard Model and beyond

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dc.contributor.author	Carrasco Vela, Nuria
dc.contributor.author	Ciuchini, M.
dc.contributor.author	Dimopoulos, P.
dc.contributor.author	Frezzotti, R.
dc.contributor.author	Giménez Gómez, Vicente
dc.contributor.author	Herdoiza, G.
dc.contributor.author	Lubicz, V.
dc.contributor.author	Michael, C.
dc.contributor.author	Picca, E.
dc.contributor.author	Rossi, G.C.
dc.contributor.author	Sanfilippo, F.
dc.contributor.author	Shindler, A.
dc.contributor.author	Silvestrini, L.
dc.contributor.author	Simula, S.
dc.contributor.author	Tarantino, C.
dc.date.accessioned	2014-09-26T07:43:33Z
dc.date.available	2014-09-26T07:43:33Z
dc.date.issued	2014
dc.identifier.citation	Carrasco Vela, Nuria Ciuchini, M. Dimopoulos, P. Frezzotti, R. Giménez Gómez, Vicente Herdoiza, G. Lubicz, V. Michael, C. Picca, E. Rossi, G.C. Sanfilippo, F. Shindler, A. Silvestrini, L. Simula, S. Tarantino, C. 2014 B-physics from Nf=2 tmQCD: the Standard Model and beyond Journal of High Energy Physics 2014 3 016
dc.identifier.uri	http://hdl.handle.net/10550/38985
dc.description.abstract	We present a lattice QCD computation of the b-quark mass, the B and B_s decay constants, the B-mixing bag parameters for the full four-fermion operator basis as well as determinations for \xi and f_{Bq}\sqrt{B_i^{(q)}} extrapolated to the continuum limit and to the physical pion mass. We used N_f = 2 twisted mass Wilson fermions at four values of the lattice spacing with pion masses ranging from 280 to 500 MeV. Extrapolation in the heavy quark mass from the charm to the bottom quark region has been carried out on ratios of physical quantities computed at nearby quark masses, exploiting the fact that they have an exactly known infinite mass limit. Our results are m_b(m_b, \overline{\rm{MS}})=4.29(12) GeV, f_{Bs}=228(8) MeV, f_{B}=189(8) MeV and f_{Bs}/f_B=1.206(24). Moreover with our results for the bag-parameters we find \xi=1.225(31), B_1^{(s)}/B_1^{(d)}=1.01(2), f_{Bd}\sqrt{\hat{B}_{1}^{(d)}} = 216(10) MeV and f_{Bs}\sqrt{\hat{B}_{1}^{(s)}} = 262(10) MeV. We also computed the bag parameters for the complete basis of the four-fermion operators which are required in beyond the SM theories. By using these results for the bag parameters we are able to provide a refined Unitarity Triangle analysis in the presence of New Physics, improving the bounds coming from B_{(s)}-\bar B_{(s)} mixing.
dc.language.iso	eng
dc.relation.ispartof	Journal of High Energy Physics, 2014, vol. 2014, num. 3, p. 016
dc.subject	Física
dc.title	B-physics from Nf=2 tmQCD: the Standard Model and beyond
dc.type	journal article	es_ES
dc.date.updated	2014-09-26T07:43:33Z
dc.identifier.doi	10.1007/JHEP03(2014)016
dc.identifier.idgrec	099207
dc.rights.accessRights	open access	es_ES