Measurement of the absolute branching fraction for Λc+→Λμ+νμ

M Ablikim,K Li,M Greco,H.M Liu,P Wang,K Liu,Q.Y Li,Y Nefedov,G Felici,L Lavezzi,N Berger,M Kavatsyuk,C Schnier,S Chen,X Liu,I Garzia,X.L Li,M Shao,P Musiol,H.B Liu,Ch Rosner,Y.F Wang,Y Hu,D Bettoni,S.Q Zhang,Y.B Chen,G Cibinetto,A Amoroso,A Zhemchugov,D Xiao,Feng Liu,T Hu,G Chelkov,G Li,M Kornicer,I Denysenko,X Tang,Z Wang,J.P Liu,W.D Li,B Zhong,Y Ban,J Liu,A Calcaterra,F.Y Li,G Mezzadri,Q Liu,C Li,X.R Chen,S Ahmed,H.Y Zhang,C Morales Morales,M.H Ye,P Kiese,T Luo,L Yang,Y Zhang,F De Mori,M Wang,M.L Chen,Z.Y Zhang,T Held,M Qi,S Nisar,Y.B Liu,J.J Zhang,V Prasad,J.Z Zhang,L Xu,Y Fang,R Farinelli,P.L Liu,H.B Li,T Weber,B Zheng,X.Y Zhang,S Spataro,B.J Liu,Y.T Zhang,K Schoenning,Q.J Liu,Z.G Wang,O Bakina,L Gong,H.S Chen,L.L Wang,D Liu,L Zhang,J Fang,G Rong,Q Zhao,S Sosio,B Kloss,M Ye,X.F Wang,Q An,Y Yuan,J.Y Liu,B.X Zhang,D.H Zhang,A Yuncu,B.L Wang,Y Pan,R Poling,Y Xia,X Fang,Z Haddadi,B.Y Zhang,T Hussain,S Jin,J.Q Zhang,K Peters,S.B Liu,W.P Wang,Z Ning,Y Zeng,Yu Zhang,J.Y Zhang,M Lara,K Wang,Ling Zhao,Y.Q Wang,J.L Zhang,Z.H Zhang,W.G Li,X.N Li,M Savrié,A Dbeyssi,L Fava,H.H Liu,H Muramatsu,O Albayrak,L.D Liu,E Fioravanti,Li Cheng,Xie Yuehong,C Dong,F Nerling,D Wang,X.Q Li,P Larin,T Holtmann,W Wang,U Wiedner,S Marcello,C Leng,K Zhang,A Hafner,J Zhuang,M Wolke,W Gradl,F Li,R Kliemt,C.C Zhang,H Xiao,H Loehner,Jin Li,B Wang,Y.D Wang,D Dedovich,S.J Chen,K Zhu,A Denig,B Kopf,F.H Liu,M Fritsch,J.C Li,Z Jiao,I Tapan,W Ikegami Andersson,Q Ouyang,L Yan,W Shan,Q Gao,I Uman,J.B Liu,F Feldbauer,K.Y Liu,M Tiemens,H.J Li,Y Wang,J Dong,X Chen,Z.P Zhang,G Chen,W Kühn,E Boger,A Sarantsev,S Pacetti,A Julin,M Bertani,T Li,M Pelizaeus,Fang Liu,Z.Q Liu,J Pettersson,M Destefanis,Y.N Zhang,Z.B Li,T Johansson,F.C Ma,P Weidenkaff,X.N Ma,Z.H Wang,H Leithoff,J Min,L Zotti,L.S Wang,Z.A Liu,M Albrecht,Z Gao,Y.B Li,J.W Zhang,R Baldini Ferroli,M Maggiora,P.L Wang,Z.Y Wang,H.H Zhang,L Xia,H Cai,F Bianchi,Y Lu,C.X Liu,Q Ji,P.R Li,J.C Chen,Y Ding,D.M Li,K Goetzen,S Han,J Zhang,M Ripka,Y.H Zhang,B Liu,Z Zeng,X L Luo ,C F Qiao ,Q L Xiu ,Gang Zhao ,W B Yan ,O B Kolcu ,N Yu Muchnoi ,A Kupść ,Zhi‐Wei Sun ,D W Bennett ,J Xu ,X T Huang ,Y T Gu ,K H Rashid ,Qin Liu ,F A Harris ,Pengfei Duan ,X Y Shen ,Tao Ma ,J F Sun ,X Ai ,W J Zheng ,H Peng ,Z L Hou ,G R Liao ,Y Ma ,L H Wu ,T J Min ,Xingxiao Ma ,J P Zheng ,P X Shen ,X H Mo ,Xingyu Zhou ,X S Jiang ,S J Qian ,F F An ,Y B Zhao ,C Z Yuan ,Q P Ji ,M M Ma ,J F Chang ,X K Chu ,J G Lu ,J S Lange ,X Y Song ,X R Lyu ,R P Guo ,G S Huang ,X D Ruan ,J M Bian ,Y Xie ,Yifan Yang ,Y H Yan ,Q A Malik ,Z P Mao ,S Sun ,Z L Dou ,Z J Xiao ,J Z Zhao ,Y Zheng ,Z Y Deng ,G Varner ,I R Boyko ,X L Kang ,J S Yu ,Xinxia Cai ,W M Song ,C L Luo ,S L Olsen ,Zhou Li ,B C Ke ,G X Sun ,S L Niu ,B X Yu ,Jiawei Zhao ,J V Bennett ,R A Briere ,J H Yin ,Zhi Wang ,H X Yang ,Z Y You ,Ning Qin ,X Y Jiang ,C X Yu ,F E Maas ,M X Luo ,X L Gao ,Q J Xu ,Y T Liang ,N Kalantar‐Nayestanaki ,H J Yang ,H L Dai ,Z G Zhao ,X H Sun ,P Patterí ,Z H Qin ,G F Cao ,L W Jiang ,X Y Niu ,X B Ji ,D P Jin ,I B Nikolaev ,X L Ji ,H Y Sheng ,Lishuang Ma ,G F Xu ,R G Ping ,J Hu ,Y J Mo ,Zhao Liu ,S J Zhao ,J S Huang ,C F Redmer ,M G Zhao ,J L Ping ,Hao Ma ,L Y Dong ,X S Kang ,S H Zhu ,Y P Guo ,S P Wen ,O Çakır ,Y S Gao ,Y K Heng ,W X Gong ,Y Z Sun ,B S Zou ,Y J Sun ,Z T Sun ,C D Fu ,Han Liu ,H Lu ,J P Dai ,J B Jiao ,A Q Guo ,X S Qin ,X Q Hao ,Xu-Dong Huang ,J Z Bai ,A A Zafar ,S A Çetin ,Z A Zhu ,Y Zhu ,D Ambrose ,Z Huang ,Lei Li ,K L He ,C Q Feng ,M Y Dong ,Q M Ma ,X C Lou ,Y P Lu ,L J Wu ,J Zhao ,Y Mao ,Y F Liang ,M H Gu ,J F Qiu ,X P Xu ,X Zhu ,X K Zhou ,F H Heinsius ,S X Du ,C J Tang ,Hu Chen ,Y H Guan ,Q Xu ,D H Wei ,H R Qi ,C P Shen ,L B Guo ,E H Thorndike ,J G Messchendorp ,S S Fang ,J Z Fan ,T C Zhao ,D X Lin ,Y S Zhu ,R E Mitchell ,H M Hu ,М Н Ачасов ,J H Zou

doi:10.1016/j.physletb.2017.01.047

Abstract

We report the first measurement of the absolute branching fraction for $\Lambda^+_{c}\rightarrow \Lambda \mu^+\nu_{\mu}$. This measurement is based on a sample of $e^+e^-$ annihilation data at a center-of-mass energy of $\sqrt{s}=4.6$ GeV collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb$^{-1}$. The branching fraction is determined to be $\mathcal B({\Lambda^+_c\rightarrow \Lambda \mu^+\nu_{\mu}})=(3.49\pm0.46({\rm stat})\pm0.27({\rm syst}))\%$. In addition, we calculate the ratio $\mathcal{B}(\Lambda^+_c\rightarrow \Lambda \mu^+\nu_{\mu})/\mathcal{B}(\Lambda^+_c\rightarrow \Lambda e^+\nu_{e})$ to be $0.96\pm0.16({\rm stat})\pm0.04({\rm syst})$.

Highlights

Semileptonic (SL) decays of the lightest charmed baryon,, provide a stringent test for non-perturbative aspects of the strong interaction theory
We report the first absolute measurement of μ+νμ) by analyzing a data sample corresponding to an integrated luminosit√y of 567 pb−1 [15] collected at a center-ofmass (c.m.) energy of s = 4.6 GeV by the BESIII detector at the BEPCII collider
The BESIII [16] detector is a cylindrical detector with a solidangle coverage of 93% of 4π that operates at the BEPCII collider

Summary

Introduction

Provide a stringent test for non-perturbative aspects of the strong interaction theory. +ν ( denotes lepton) decay is dominated by the Cabibbo-favored transition c → s +ν , which occurs independently of the spin-zero and isospin-zero spectator ud diquark, to good approximation. This leads to a simpler theoretical description and greater predictive power in the non-perturbative models than in the case for charmed mesons [1]. 5 at the Novosibirsk State University, Novosibirsk 630090, Russia. Lepton universality can be tested by comparing the BFs between the electronic and muonic decay modes. C is detected in a number of prolific decay channels This will provide a straightforward and direct BF measurement without requiring knowledge of the total number of. Charge conjugated modes are always implied, unless explicitly mentioned

BESIII detector and Monte Carlo simulation

Analysis

Summary an