Observation of the baryonic flavor-changing neutral current decay Λb(0)→Λμ+μ

We report the first observation of the baryonic flavor-changing neutral current decay Λ(b)(0)→Λμ(+)μ(-) with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a pp collisions data sample corresponding to 6.8 fb(-1) at √s = 1.96 TeV collected b...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2011-11, Vol.107 (20), p.201802-201802
Main Authors: Aaltonen, T, González, B Alvarez, Amerio, S, Amidei, D, Anastassov, A, Annovi, A, Antos, J, Apollinari, G, Appel, J A, Apresyan, A, Arisawa, T, Artikov, A, Asaadi, J, Ashmanskas, W, Auerbach, B, Aurisano, A, Azfar, F, Badgett, W, Barbaro-Galtieri, A, Barnes, V E, Barnett, B A, Barria, P, Bartos, P, Bauce, M, Bauer, G, Bedeschi, F, Beecher, D, Behari, S, Bellettini, G, Bellinger, J, Benjamin, D, Beretvas, A, Bhatti, A, Binkley, M, Bisello, D, Bizjak, I, Bland, K R, Blocker, C, Blumenfeld, B, Bocci, A, Bodek, A, Bortoletto, D, Boudreau, J, Boveia, A, Brau, B, Brigliadori, L, Brisuda, A, Bromberg, C, Brucken, E, Bucciantonio, M, Budagov, J, Budd, H S, Budd, S, Burkett, K, Busetto, G, Bussey, P, Buzatu, A, Cabrera, S, Calancha, C, Camarda, S, Campanelli, M, Campbell, M, Canelli, F, Canepa, A, Carls, B, Carlsmith, D, Carosi, R, Carrillo, S, Carron, S, Casal, B, Casarsa, M, Castro, A, Catastini, P, Cauz, D, Cavaliere, V, Cavalli-Sforza, M, Cerri, A, Cerrito, L, Chen, Y C, Chertok, M, Chiarelli, G, Chlachidze, G, Chlebana, F, Cho, K, Chokheli, D, Chou, J P, Chung, W H, Chung, Y S, Ciobanu, C I, Ciocci, M A, Clark, A, Clark, D, Compostella, G, Convery, M E, Conway, J, Corbo, M, Cordelli, M, Cox, C A, Cox, D J, Crescioli, F
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report the first observation of the baryonic flavor-changing neutral current decay Λ(b)(0)→Λμ(+)μ(-) with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a pp collisions data sample corresponding to 6.8 fb(-1) at √s = 1.96 TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for Λ(b)(0)→Λμ(+)μ(-) are measured. We find B(Λ(b)(0)→Λμ(+)μ(-))=[1.73 ± 0.42(stat) ± (syst)] × 10(-6). We also report the first measurement of the differential branching ratio of B(s)(0)→ϕμ(+)μ(-), using 49 signal events. In addition, we report branching ratios for B(+)→K(+)μ(+)μ(-), B(0)→K(0)μ(+)μ(-), and B→K(*)(892)μ(+)μ(-) decays.
ISSN:1079-7114