Zobrazeno 1 - 10
of 300
pro vyhledávání: '"Raynal, J. -C."'
Publikováno v:
Phys. Rev. D 93, 114020 (2016)
The Bakamjian-Thomas relativistic quark model, describing hadrons with a fixed number of constituents, yields in the heavy quark limit of QCD covariant Isgur-Wise functions and satisfies the whole tower of lowest moment sum rules (Bjorken-Uraltsev ty
Externí odkaz:
http://arxiv.org/abs/1510.07174
Publikováno v:
Phys. Rev. D 90, 114014 (2014)
The Bakamjian-Thomas relativistic quark model for hadron current matrix elements, while non-covariant at finite mass, is successful in the heavy quark limit : form factors are covariant and satisfy Isgur-Wise scaling and Bjorken-Uraltsev sum rules. M
Externí odkaz:
http://arxiv.org/abs/1407.1152
Publikováno v:
Phys. Rev. D 90, 114016 (2014)
We pursue the group theoretical method to study Isgur-Wise functions. We apply the general formalism, formerly applied to the baryon case j^P = 0^+ (for \Lambda_b -> \Lambda_c \ell \nu), to mesons with j^P = 1/2^-, i.e. $\overline{B} -> D(D^{(*)})\el
Externí odkaz:
http://arxiv.org/abs/1407.1001
Publikováno v:
Phys.Rev.D82:117502,2010
At LHC a large number of b-flavored baryons will be produced. In this note we propose new baryon modes to determine the photon helicity of the penguin transition $b \to s \gamma$. The decay $\Lambda_b \to \Lambda \gamma$ has the drawback that the $\L
Externí odkaz:
http://arxiv.org/abs/1007.3632
Publikováno v:
Phys.Rev.D80:054006,2009
We propose a group theoretical method to study Isgur-Wise functions. A current matrix element splits into a heavy quark matrix element and an overlap of the initial and final clouds, related to the IW functions, that contain the long distance physics
Externí odkaz:
http://arxiv.org/abs/0904.1942
Publikováno v:
Phys.Rev.D79:014023,2009
In the heavy quark limit of QCD, using the Operator Product Expansion, the formalism of Falk for hadrons or arbitrary spin, and the non-forward amplitude, as proposed by Uraltsev, we formulate sum rules involving the Isgur-Wise function $\xi_{\Lambda
Externí odkaz:
http://arxiv.org/abs/0808.2983
Autor:
Bigi, I. I., Blossier, B., Yaouanc, A. Le, Oliver, L., Pène, O., Raynal, J. -C., Oyanguren, A., Roudeau, P.
Publikováno v:
Eur.Phys.J.C52:975-985,2007
The OPE treatment that has been so successful in describing inclusive $\bar B \to l \bar \nu X_c$ decays yields sum rules (in particular the Uraltsev sum rule and its higher moments) implying the dominance of the $P$ wave $j_q = 3/2$ charm states in
Externí odkaz:
http://arxiv.org/abs/0708.1621
Publikováno v:
Phys.Rev.D77:034005,2008
The Bakamjian-Thomas relativistic quark model provides a Poincar\'e representation of bound states with a fixed number of constituents and, in the heavy quark limit, form factors of currents satisfy covariance and Isgur-Wise scaling. We compute the L
Externí odkaz:
http://arxiv.org/abs/0707.3027
Publikováno v:
Phys.Rev.D75:113001,2007
We revisit the problem of interplay between the strong and the Coulomb interaction in the charged-to-neutral yield ratio for $B {\bar B}$ and $D {\bar D}$ pairs near their respective thresholds in $e^+e^-$ annihilation. We consider here a realistic s
Externí odkaz:
http://arxiv.org/abs/0704.0293
From sum rules in the heavy quark limit of QCD, using the non-forward amplitude, we demonstrate that if the slope rho^2 = -xsi'(1) of the Isgur-Wise function xsi(w) attains its lower bound 3/4 (as happens in the BPS limit proposed by Uraltsev), the I
Externí odkaz:
http://arxiv.org/abs/hep-ph/0611031