A lattice study of the exclusive B --> K$*\gamma$ decay amplitude, using the Clover action at $\beta$ = 6.0

We present the results of a numerical calculation of the B\rightarrow K^* \gamma form factors. The results have been obtained by studying the relevant correlation functions at \beta=6.0, on an 18^3 \times 64 lattice, using the {\rm O(a)}-improved fermion action, in the quenched approximation. From t...

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Detalles Bibliográficos
Autores principales: Abada, A., Boucaud, Ph, Cabibbo, N, Crisafulli, M, Leroy, J.P, Lubicz, V, Martinelli, G, Rapuano, F, Serone, M, Stella, N, Bartoloni, A, Battista, C, Cabasino, S, Panizzi, E, Paolucci, P.S, Sarno, R, Todesco, G.M, Torelli, M, Vicini, P
Lenguaje:eng
Publicado: 1995
Materias:
Particle Physics - Lattice
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(95)01236-2
http://cds.cern.ch/record/278946
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author Abada, A.
Boucaud, Ph
Cabibbo, N
Crisafulli, M
Leroy, J.P
Lubicz, V
Martinelli, G
Rapuano, F
Serone, M
Stella, N
Bartoloni, A
Battista, C
Cabasino, S
Panizzi, E
Paolucci, P.S
Sarno, R
Todesco, G.M
Torelli, M
Vicini, P
author_facet Abada, A.
Boucaud, Ph
Cabibbo, N
Crisafulli, M
Leroy, J.P
Lubicz, V
Martinelli, G
Rapuano, F
Serone, M
Stella, N
Bartoloni, A
Battista, C
Cabasino, S
Panizzi, E
Paolucci, P.S
Sarno, R
Todesco, G.M
Torelli, M
Vicini, P
author_sort Abada, A.
collection CERN
description We present the results of a numerical calculation of the B\rightarrow K^* \gamma form factors. The results have been obtained by studying the relevant correlation functions at \beta=6.0, on an 18^3 \times 64 lattice, using the {\rm O(a)}-improved fermion action, in the quenched approximation. From the study of the matrix element \langle K^*\vert \bar s \sigma_{\mu\nu} b \vert B\rangle we have obtained the form factor T_1(0) which controls the exclusive decay rate. The results are compared with the recent results from CLEO. We also discuss the compatibility between the scaling laws predicted by the Heavy Quark Effective Theory (HQET) and pole dominance, by studying the mass- and q^2-dependence of the form factors. From our analysis, it appears that the form factors follow a mass behaviour compatible with the predictions of the HQET and that the q^2-dependence of T_2 is weaker than would be predicted by pole dominance.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1995
record_format invenio
spelling cern-2789462023-03-14T18:56:26Zdoi:10.1016/0370-2693(95)01236-2http://cds.cern.ch/record/278946engAbada, A.Boucaud, PhCabibbo, NCrisafulli, MLeroy, J.PLubicz, VMartinelli, GRapuano, FSerone, MStella, NBartoloni, ABattista, CCabasino, SPanizzi, EPaolucci, P.SSarno, RTodesco, G.MTorelli, MVicini, PA lattice study of the exclusive B --> K$*\gamma$ decay amplitude, using the Clover action at $\beta$ = 6.0Particle Physics - LatticeWe present the results of a numerical calculation of the B\rightarrow K^* \gamma form factors. The results have been obtained by studying the relevant correlation functions at \beta=6.0, on an 18^3 \times 64 lattice, using the {\rm O(a)}-improved fermion action, in the quenched approximation. From the study of the matrix element \langle K^*\vert \bar s \sigma_{\mu\nu} b \vert B\rangle we have obtained the form factor T_1(0) which controls the exclusive decay rate. The results are compared with the recent results from CLEO. We also discuss the compatibility between the scaling laws predicted by the Heavy Quark Effective Theory (HQET) and pole dominance, by studying the mass- and q^2-dependence of the form factors. From our analysis, it appears that the form factors follow a mass behaviour compatible with the predictions of the HQET and that the q^2-dependence of T_2 is weaker than would be predicted by pole dominance.We present the results of a numerical calculation of the $B\rightarrow K~* \gamma$ form factors. The results have been obtained by studying the relevant correlation functions at $\beta=6.0$, on an $18~3 \times 64$ lattice, using the ${\rm O(a)}$-improved fermion action, in the quenched approximation. From the study of the matrix element $ \langle K~*\vert \bar s \sigma_{\mu\nu} b \vert B\rangle$ we have obtained the form factor $T_1(0)$ which controls the exclusive decay rate. The results are compared with the recent results from CLEO. We also discuss the compatibility between the scaling laws predicted by the Heavy Quark Effective Theory (HQET) and pole dominance, by studying the mass- and $q~2$-dependence of the form factors. From our analysis, it appears that the form factors follow a mass behaviour compatible with the predictions of the HQET and that the $q~2$-dependence of $T_2$ is weaker than would be predicted by pole dominance.We present the results of a numerical calculation of the B → K ∗ γ form factors. The results have been obtained by studying the relevant correlation functions at β = 6.0, on an 18 3 × 64 lattice, using the O ( a )-improved fermion action, in the quenched approximation. From the study of the matrix element 〈K ∗ | s σ μν b|B〉 we have obtained the form factor T 1 (0) which controls the exclusive decay rate. The results are compared with the recent results from CLEO. We also discuss the compatibility between the scaling laws predicted by the Heavy Quark Effective Theory (HQET) and pole dominance, by studying the mass- and q 2 -dependence of the form factors. From our analysis, it appears that the form factors follow a mass behaviour compatible with the predictions of the HQET and that the q 2 -dependence of T 2 is weaker than would be predicted by pole dominance.hep-lat/9503020CERN-TH-95-59CERN-TH-95-059ROME-1056-1994LPTHE-ORSAY-94-88SHEP-95-11CERN-TH-95-59ROMA-1-1056LPT-HE-ORSAY-94-88SHEP-95-11oai:cds.cern.ch:2789461995-03-20
spellingShingle Particle Physics - Lattice
Abada, A.
Boucaud, Ph
Cabibbo, N
Crisafulli, M
Leroy, J.P
Lubicz, V
Martinelli, G
Rapuano, F
Serone, M
Stella, N
Bartoloni, A
Battista, C
Cabasino, S
Panizzi, E
Paolucci, P.S
Sarno, R
Todesco, G.M
Torelli, M
Vicini, P
A lattice study of the exclusive B --> K$*\gamma$ decay amplitude, using the Clover action at $\beta$ = 6.0
title A lattice study of the exclusive B --> K$*\gamma$ decay amplitude, using the Clover action at $\beta$ = 6.0
title_full A lattice study of the exclusive B --> K$*\gamma$ decay amplitude, using the Clover action at $\beta$ = 6.0
title_fullStr A lattice study of the exclusive B --> K$*\gamma$ decay amplitude, using the Clover action at $\beta$ = 6.0
title_full_unstemmed A lattice study of the exclusive B --> K$*\gamma$ decay amplitude, using the Clover action at $\beta$ = 6.0
title_short A lattice study of the exclusive B --> K$*\gamma$ decay amplitude, using the Clover action at $\beta$ = 6.0
title_sort lattice study of the exclusive b --> k$*\gamma$ decay amplitude, using the clover action at $\beta$ = 6.0
topic Particle Physics - Lattice
url https://dx.doi.org/10.1016/0370-2693(95)01236-2
http://cds.cern.ch/record/278946
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