標題: | Lambda(b) -> pl(-)(v)over-bar(l) form factors from lattice QCD with static b quarks |
作者: | Detmold, William Lin, C-J. David Meinel, Stefan Wingate, Matthew 物理研究所 Institute of Physics |
公開日期: | 23-七月-2013 |
摘要: | We present a lattice QCD calculation of form factors for the decay Lambda(b) -> p mu(-)(v) over bar (mu), which is a promising channel for determining the Cabibbo- Kobayashi-Maskawa matrix element vertical bar V-ub vertical bar at the Large Hadron Collider. In this initial study we work in the limit of static b quarks, where the number of independent form factors reduces to two. We use dynamical domain-wall fermions for the light quarks, and perform the calculation at two different lattice spacings and at multiple values of the light-quark masses in a single large volume. Using our form factor results, we calculate the Lambda(b) -> p mu-(v) over bar (mu) differential decay rate in the range 14 GeV2 <= q(2) <= q(max)(2), and obtain the integral integral(q2max)(14 GeV2) [d Gamma/dq(2)]dq(2)/vertical bar V-ub vertical bar(2) = 15.3 +/- 4.2 ps(-1). Combined with future experimental data, this will give a novel determination of vertical bar V-ub vertical bar with about 15% theoretical uncertainty. The uncertainty is dominated by the use of the static approximation for the b quark, and can be reduced further by performing the lattice calculation with a more sophisticated heavy-quark action. |
URI: | http://dx.doi.org/10.1103/PhysRevD.88.014512 http://hdl.handle.net/11536/22181 |
ISSN: | 1550-7998 |
DOI: | 10.1103/PhysRevD.88.014512 |
期刊: | PHYSICAL REVIEW D |
Volume: | 88 |
Issue: | 1 |
起始頁: | 0 |
結束頁: | 0 |
顯示於類別: | 期刊論文 |