Observation of the baryonic flavor-changing neutral current decay Λb(0)→Λμ+μ-.
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,Almenar C Cuenca,Cuevas J,Culbertson R,Dagenhart D,d'Ascenzo N,Datta M,de Barbaro P,De Cecco S,De Lorenzo G,Dell'Orso M,Deluca C,Demortier L,Deng J,Deninno M,Devoto F,d'Errico M,Di Canto A,Di Ruzza B,Dittmann J R,D'Onofrio M,Donati S,Dong P,Dorigo T,Ebina K,Elagin A,Eppig A,Erbacher R,Errede D,Errede S,Ershaidat N,Eusebi R,Fang H C,Farrington S,Feindt M,Fernandez J P,Ferrazza C,Field R,Flanagan G,Forrest R,Frank M J,Franklin M,Freeman J C,Furic I,Gallinaro M,Galyardt J,Garcia J E,Garfinkel A F,Garosi P,Gerberich H,Gerchtein E,Giagu S,Giakoumopoulou V,Giannetti P,Gibson K,Ginsburg C M,Giokaris N,Giromini P,Giunta M,Giurgiu G,Glagolev V,Glenzinski D,Gold M,Goldin D,Goldschmidt N,Golossanov A,Gomez G,Gomez-Ceballos G,Goncharov M,González O,Gorelov I,Goshaw A T,Goulianos K,Gresele A,Grinstein S,Grosso-Pilcher C,Group R C,Guimaraes da Costa J,Gunay-Unalan Z,Haber C,Hahn S R,Halkiadakis E,Hamaguchi A,Han J Y,Happacher F,Hara K,Hare D,Hare M,Harr R 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F,Marino C,Martínez M,Martínez-Ballarín R,Mastrandrea P,Mathis M,Mattson M E,Mazzanti P,McFarland K S,McIntyre P,McNulty R,Mehta A,Mehtala P,Menzione A,Mesropian C,Miao T,Mietlicki D,Mitra A,Miyake H,Moed S,Moggi N,Mondragon M N,Moon C S,Moore R,Morello M J,Morlock J,Fernandez P Movilla,Mukherjee A,Muller Th,Murat P,Mussini M,Nachtman J,Nagai Y,Naganoma J,Nakano I,Napier A,Nett J,Neu C,Neubauer M S,Nielsen J,Nodulman L,Norniella O,Nurse E,Oakes L,Oh S H,Oh Y D,Oksuzian I,Okusawa T,Orava R,Ortolan L,Griso S Pagan,Pagliarone C,Palencia E,Papadimitriou V,Paramonov A A,Patrick J,Pauletta G,Paulini M,Paus C,Pellett D E,Penzo A,Phillips T J,Piacentino G,Pianori E,Pilot J,Pitts K,Plager C,Pondrom L,Potamianos K,Poukhov O,Prokoshin F,Pronko A,Ptohos F,Pueschel E,Punzi G,Pursley J,Rahaman A,Ramakrishnan V,Ranjan N,Redondo I,Renton P,Rescigno M,Rimondi F,Ristori L,Robson A,Rodrigo T,Rodriguez T,Rogers E,Rolli S,Roser R,Rossi M,Ruffini F,Ruiz A,Russ J,Rusu V,Safonov A,Sakumoto W K,Santi L,Sartori 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Physical review letters（2011）
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Abstract
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.
