Constraining λbs by Bs →γ∗ and Bs →φ form factors

Autor(en)

Mikhail A. Ivanov, Dmitri Melikhov, Silvano Simula

Abstrakt

We calculate the form factors FV(q2,q′2) and FTV(q2,q′2) describing the Bs→γ∗ transition induced by the vector and tensor weak currents in a broad range of values of q2 and q′2 far below the quark thresholds in both q2 and q′2 channels. These form factors are calculated via the distribution amplitudes of the Bs-meson. We then interpolate the obtained results by a formula that contains pole at q′2=Mφ2 and extract the residue which gives the Bs→φ transition form factors V(q2) and T1(q2). In this way we obtain theoretical predictions for these form factors without invoking quark-hadron duality and QCD sum rules. Furthermore, we calculate the relationship between V(0) and T1(0) and the parameter λBs(μ), the inverse moment of the Bs-meson distribution amplitude. Using the available predictions for V(0) and T1(0) coming from approaches not referring to the Bs-meson distribution amplitudes, we obtain the estimate λBs(μ≃mb)=(0.62±0.10) GeV.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Joint Institute for Nuclear Research, Lomonosov Moscow State University (MSU), Universität Wien, Istituto Nazionale di Fisica Nucleare (INFN), Roma

Journal

Physical Review D

Band

110

Anzahl der Seiten

10

ISSN

2470-0010

DOI

https://doi.org/10.1103/PhysRevD.110.094048

Publikationsdatum

11-2024

Peer-reviewed

Ja

ÖFOS 2012

103012 Hochenergiephysik

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0c4add29-4777-4893-beca-930130bf7689