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DETERMINATION OF J PSI LEPTONIC BRANCHING FRACTION VIA PSI(2S)-]PI(+)PI(-)J/PSI - ART. NO. 092006/

Authors

BAI JZ BIAN JG BLUM I CHAI ZW CHEN GP CHEN HF CHEN J CHEN JC CHEN Y CHEN YB CHEN YQ CHENG BS CUI XZ DING HL DING LY DONG LY DU ZZ DUNWOODIE W FENG S GAO CS GAO ML GAO SQ GRATTON P GU JH GU SD GU WX GU YF GUO YN HAN SW HAN Y HARRIS FA HE J HE JT HE M HITLIN DG HU GY HU HM HU JL HU QH HU T HU XQ HUANG JD HUANG YZ IZEN JM JIANG CH JIN Y KE ZJ KELSEY MH KIM BK KONG D LAI YF LANG PF LANKFORD A LI CG LI D LI HB LI J LI PQ LI RB LI W LI WD LI WG LI XH LI XN LIU HM LIU J LIU JH LIU RG LIU Y LOU XC LOWERY B LU F LU JG LU JY LU LC LUO CH MA AM MA EC MA JM MALCHOW R MAO HS MAO ZP MENG XC NIE J OLSEN SL OYANG J PALUSELLI D PAN LJ PANETTA J PORTER F QI ND QI XR QIAN CD QIU JF QU YH QUE YK RONG G SCHERNAU M SHAO YY SHEN BW SHEN DL SHEN H SHEN XY SHENG HY SHI HZ SONG XF STANDIFIRD J SUN F SUN HS TANG SQ TOKI W TONG GL WANG F WANG LS WANG LZ WANG M WANG M WANG P WANG PL WANG SM WANG TJ WANG YY WEAVER M WEI CL WU YG XI DM XIA XM XIE PP XIE Y XIE YH XIONG WJ XU CC XU GF XUE ST YAN J YAN WG YANG CM YANG CY YANG J YANG W YANG XF YE MH YE SW YE YX YI K YU CS YU CX YU YH YU ZQ YU ZT YUAN CZ YUAN Y ZHANG BY ZHANG CC ZHANG DH ZHANG DH ZHANG HL ZHANG J ZHANG JL ZHANG JW ZHANG LS ZHANG QJ ZHANG SQ ZHANG XY ZHANG Y ZHANG YY ZHAO DX ZHAO HW ZHAO JW ZHAO M ZHAO WR ZHAO ZG ZHENG JP ZHENG LS ZHENG ZP ZHOU GP ZHOU HS ZHOU L ZHU QM ZHU YC ZHU YS ZHUANG BA

Citation

Jz. Bai et al., DETERMINATION OF J PSI LEPTONIC BRANCHING FRACTION VIA PSI(2S)-]PI(+)PI(-)J/PSI - ART. NO. 092006/, Physical review. D. Particles and fields, 5809(9), 1998, pp. 2006

Citations number

Categorie Soggetti

Physics, Particles & Fields

Journal title

Physical review. D. Particles and fields → ACNP

ISSN journal

05562821

Volume

5809

Issue

Year of publication

1998

Database

ISI

SICI code

0556-2821(1998)5809:9<2006:DOJPLB>2.0.ZU;2-1

Abstract

A comparison of the rates for psi(2S) --> pi(+) pi(-) J/psi, J/psi --> l(+)l(-) and J/psi --> anything is used to determine the J/psi lepton ic branching fractions. The results are B(J/psi --> e(+)e(-)) = (5.90 +/- 0.05 +/- 0.10)% and B(J/psi --> mu(+)mu(-)) = (5.84 +/- 0.06 +/- 0 .10)%, where the first error is statistical and the second is systemat ic. Assuming lepton universality, the leptonic branching fraction of t he J/psi is B(J/psi --> l(+)l(-)) = (5.87 +/- 0.04 +/- 0.09)% per spec ies. This result is used to estimate the QCD scale factor Lambda(MS)(( 4)) and the strong coupling constant alpha(s). [S0556-2821(98)07021-0] .