DIRECT MEASUREMENT OF THE J/PSI LEPTONIC BRANCHING FRACTION

被引:26
作者
COFFMAN, D
DEJONGH, F
DUBOIS, GP
EIGEN, G
HITLIN, DG
MATTHEWS, CG
RICHMAN, J
WEINSTEIN, AJ
WISNIEWSKI, WJ
ZHU, Y
BOLTON, T
BUNNELL, KO
CASSELL, RE
COWARD, DH
KIM, PC
LABS, J
ODIAN, A
PITMAN, D
SCHINDLER, RH
TOKI, W
WASSERBAECH, S
DRINKARD, JJ
GATTO, C
HEUSCH, CA
LOCKMAN, WS
SADROZINSKI, HFW
SCARLATELLA, M
SCHALK, TL
SEIDEN, A
XU, R
EISENSTEIN, BI
FREESE, T
GLADDING, G
IZEN, JM
STOCKDALE, IE
TRIPSAS, B
MALLIK, U
WANG, MZ
BROWN, JS
BURNETT, TH
LI, AD
MIR, R
MOCKETT, PM
NEMATI, B
PARRISH, L
WILLUTZKI, H
机构
[1] STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305
[2] UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064
[3] UNIV ILLINOIS,URBANA,IL 61801
[4] UNIV WASHINGTON,SEATTLE,WA 98195
[5] UNIV IOWA,IOWA CITY,IA 52242
关键词
D O I
10.1103/PhysRevLett.68.282
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The Mark III Collaboration has measured the J/psi leptonic branching fractions using the process psi(2S) --> pi+ pi- J/psi, J/psi --> l+ l-. The results are B(J/psi --> e+ e-) = (5.92 +/- 0.15 +/- 0.20)% and B(J/psi --> mu+ mu-) = (5.90 +/- 0.15 +/- 0.19)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/psi is (5.91 +/- 0.11 +/- 0.20)%. This result is used to obtain the strong coupling constant alpha(s) and the QCD scale factor LAMBDA(MSBAR) (MSBAR denotes the modified minimal subtraction scheme).
引用
收藏
页码:282 / 285
页数:4
相关论文
共 10 条
[1]   THE MARK-III VERTEX CHAMBER [J].
ADLER, J ;
BOLTON, T ;
BUNNELL, K ;
CASSELL, R ;
CHEU, E ;
EISELE, R ;
FREESE, T ;
GRAB, C ;
MAZAHERI, G ;
MIR, R ;
ODIAN, A ;
PITMAN, D ;
STOCKHAUSEN, W ;
TOKI, W ;
VILLA, F ;
WADLEY, W ;
WASSERBAECH, S ;
WISNIEWSKI, W .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1989, 276 (1-2) :42-52
[2]   HEAVY QUARKS AND E+E- ANNIHILATION [J].
APPELQUIST, T ;
POLITZER, HD .
PHYSICAL REVIEW LETTERS, 1975, 34 (01) :43-45
[3]   DECAYS OF THE J/PSI INTO 2 PSEUDOSCALAR MESONS [J].
BALTRUSAITIS, RM ;
COFFMAN, D ;
HAUSER, J ;
HITLIN, DG ;
RICHMAN, JD ;
RUSSELL, JJ ;
SCHINDLER, RH ;
DORFAN, DE ;
FABRIZIO, R ;
GRANCAGNOLO, F ;
HAMILTON, RP ;
HEUSCH, CA ;
KOPKE, L ;
PARTRIDGE, R ;
PERRIER, J ;
SADROZINSKI, HFW ;
SCARLATELLA, M ;
SCHALK, TL ;
SEIDEN, A ;
WEINSTEIN, AJ ;
BECKER, JJ ;
BLAYLOCK, GT ;
BROWN, JS ;
CUI, H ;
EISENSTEIN, BI ;
GLADDING, G ;
PLAETZER, SA ;
SPADAFORA, AL ;
THALER, JJ ;
WATTENBERG, A ;
WISNIEWSKI, WJ ;
BUNNELL, KO ;
CASSELL, RE ;
COWARD, DH ;
EINSWEILER, KF ;
MOSS, L ;
MOZLEY, RF ;
ODIAN, A ;
ROEHRIG, JR ;
TOKI, W ;
UNNO, Y ;
VILLA, F ;
WERMES, N ;
WISINSKI, D ;
BURNETT, TH ;
COOK, V ;
DELPAPA, C ;
DUNCAN, AL ;
MOCKETT, PM ;
NAPPI, A .
PHYSICAL REVIEW D, 1985, 32 (03) :566-574
[4]  
BERENDS FA, 1983, ACTA PHYS POL B, V14, P413
[5]   THE MARK III SPECTROMETER [J].
BERNSTEIN, D ;
BERNSTEIN, J ;
BUNNELL, K ;
BURGUENO, G ;
CASSELL, R ;
COLLINS, B ;
COWARD, D ;
EINSWEILER, K ;
EISELE, R ;
HABER, B ;
HUTCHINSON, D ;
MAZAHERI, G ;
MCNERNEY, E ;
MOSS, L ;
MOZLEY, R ;
ODIAN, A ;
ROEHRIG, J ;
SKARPAAS, K ;
SUKIENNICKI, B ;
TOKI, W ;
UNNO, Y ;
VILLA, F ;
WADLEY, W ;
WERMES, N ;
WISINSKI, D ;
BALTRUSAITIS, R ;
BELYANSKY, G ;
COFFMAN, D ;
COOPER, R ;
FREIDLER, W ;
GRAU, H ;
HAUSER, J ;
HITLIN, D ;
RICHMAN, J ;
RUSSELL, J ;
SCHINDLER, R ;
BECKER, J ;
BLAYLOCK, G ;
CUI, H ;
EISENSTEIN, B ;
GLADDING, G ;
KOHLMEIER, J ;
PLAETZER, S ;
SIMAITIS, V ;
SPADAFORA, A ;
THALER, J ;
WATTENBERG, A ;
WISNIEWSKI, W ;
BLEDSOE, H ;
DORFAN, D .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1984, 226 (2-3) :301-318
[6]   QUANTUM NUMBERS AND DECAY WIDTHS OF PSI(3095) [J].
BOYARSKI, AM ;
BREIDENBACH, M ;
BULOS, F ;
FELDMAN, GJ ;
FISCHER, GE ;
FRYBERGER, D ;
HANSON, G ;
JEANMARIE, B ;
LARSEN, RR ;
LUKE, D ;
LUTH, V ;
LYNCH, HL ;
LYON, D ;
MOREHOUSE, CC ;
PATERSON, JM ;
PERL, ML ;
RAPIDIS, P ;
RICHTER, B ;
SCHWITTERS, RF ;
TANENBAUM, W ;
VANNUCCI, F ;
ABRAMS, GS ;
BRIGGS, DD ;
CHINOWSKY, W ;
FRIEDBERG, CE ;
GOLHABER, G ;
KADYK, JA ;
LITKE, AM ;
LULU, BA ;
PIERRE, FM ;
SADOULET, B ;
TRILLING, GH ;
WHITAKER, JS ;
WINKELMANN, F ;
WISS, JE .
PHYSICAL REVIEW LETTERS, 1975, 34 (21) :1357-1360
[7]   ANGULAR-DISTRIBUTIONS IN DECAY PSI'-]PSI-PI-PI [J].
CAHN, RN .
PHYSICAL REVIEW D, 1975, 12 (11) :3559-3563
[8]  
HERNANDEZ JJ, 1990, PHYS LETT B, V239, P1
[9]   QUARKONIUM ANNIHILATION RATES [J].
KWONG, WW ;
MACKENZIE, PB ;
ROSENFELD, R ;
ROSNER, JL .
PHYSICAL REVIEW D, 1988, 37 (11) :3210-3215
[10]   2-PION SPECTRUM AND ANGULAR-DISTRIBUTION IN PSI'-]PSI+2-PI DECAYS [J].
PHAM, TN ;
PIRE, B ;
TRUONG, TN .
PHYSICS LETTERS B, 1976, 61 (02) :183-186