2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 18, 157-166
DOI 10.1007/s100520000502

A theoretical prediction of the Bs meson lifetime difference

D. Becirevic1 - D. Meloni1 - A. Retico1 - V. Giménez2 - V. Lubicz3 - G. Martinelli4

1 Dip. di Fisica, Univ. di Roma ``La Sapienza'' and INFN, Sezione di Roma, P.le A. Moro 2, 00185 Roma, Italy
2 Dep. de Física Teòrica and IFIC, Univ. de València, Dr. Moliner 50, 46100, Burjassot, València, Spain
3 Dipartimento di Fisica, Università di Roma Tre and INFN, Sezione di Roma Tre, Via della Vasca Navale 84,
00146 Rome, Italy
4 Centre de Physique Théorique de l'École Polytechnique, 91128 Palaiseau-Cedex, France

Received: 13 June 2000 / Published online: 13 November 2000 - © Springer-Verlag 2000

Abstract
We present the results of a quenched lattice calculation of the operator matrix elements relevant for predicting the Bs width difference. Our main result is $\left(\Delta\Gamma_{B_s}/\Gamma_{B_s}\right)= (4.7 \pm 1.5
\pm 1.6)
\times 10^{-2}$, obtained from the ratio of matrix elements ${\cal R}(m_b)=
\langle \bar B_s^0\vert Q_{S}\vert B_s^0\rangle/
\langle \bar B_s^0\vert Q_{L}\vert B_s^0\rangle=-0.93(3
)^{+0.00}_{-0.01}$. ${\cal R}(m_b)$ was evaluated from the two relevant B parameters $B_{S}^{\overline{\mathrm {MS}}} (m_b) = 0.86(2)^{+0.02}_{-0.03}$ and $B_{B_s}^{\overline{\mathrm {MS}}} (m_b) = 0.91(3)^{+0.00}_{-0.06}$, which we computed in our simulation.


Copyright Società Italiana di Fisica, Springer-Verlag 2000