@Article{LHCbCollaborationAaij_etal2015, author="LHCb Collaboration (Aaij, R. et al and Martinez-Vidal, F. and Oyanguren, A. and Ruiz Valls, P. and Sanchez Mayordomo, C.", title="Evidence for the Strangeness-Changing Weak Decay Xi(-)(b) -> Lambda(0)(b)pi(-)", journal="Physical Review Letters", year="2015", publisher="Amer Physical Soc", volume="115", number="24", pages="241801 - 10pp", abstract="Using a pp collision data sample corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb detector, we present the first search for the strangeness-changing weak decay Xi(-)(b) -> Delta(0)(b)pi(-). No b hadron decay of this type has been seen before. A signal for this decay, corresponding to a significance of 3.2 standard deviations, is reported. The relative rate is measured to be f Xi(-)(b)/f Lambda B-0(b)(Xi(-)(b) -> Lambda(0)(b)pi(-)) = (5.7 +/- 1.8(-0.9)(+0.8)) x 10(-4) where f Xi(-)(b) and f Lambda(0)(b) are the b -> Xi(-)(b) and b -> Lambda(0)(b) fragmentation fractions, and B(Xi(-)(b) -> Lambda(0)(b)pi(-)) is the branching fraction. Assuming f Xi(-)(b)/f Lambda(0)(b) is bounded between 0.1 and 0.3, the branching fraction B(Xi(-)(b) -> Lambda(0)(b)pi(-)) would lie in the range from (0.57 +/- 0.21){\%} to (0.19 +/- 0.07){\%}.", optnote="WOS:000366171900003", optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2484), last updated on Fri, 01 Jan 2016 21:03:50 +0000", issn="0031-9007", doi="10.1103/PhysRevLett.115.241801", opturl="http://arxiv.org/abs/1510.03829", opturl="https://doi.org/10.1103/PhysRevLett.115.241801", archivePrefix="arXiv", eprint="1510.03829", language="English" }