Observation of the radiative decay J/psi->e(+)e(-)gamma

被引：16

作者：

Armstrong, TA

Bettoni, D

Bharadwaj, V

Biino, C

Borreani, G

Broemmelsiek, D

Buzzo, A

Calabrese, R

Ceccucci, A

Cester, R

Church, M

Dalpiaz, P

Dalpiaz, PF

Dimitroyannis, D

Fabbri, M

Fast, J

Gianoli, A

Ginsburg, CM

Gollwitzer, K

Govi, G

Hahn, A

Hasan, M

Hsueh, S

Lewis, R

Luppi, E

Macri, M

Majewska, AM

Mandelkern, M

Marchetto, F

Marinelli, M

Marques, J

Marsh, W

Martini, M

Masuzawa, M

Menichetti, E

Migliori, A

Mussa, R

Palestini, S

Pallavicini, M

Passaggio, S

Pastrone, N

Patrignani, C

Peoples, J

Petrucci, F

Pia, MG

Pordes, S

Rapidis, P

Ray, R

Reid, J

Rinaudo, G

机构：

[1] FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510

[2] UNIV FERRARA,I-44100 FERRARA,ITALY

[3] IST NAZL FIS NUCL,I-44100 FERRARA,ITALY

[4] IST NAZL FIS NUCL,I-16146 GENOA,ITALY

[5] UNIV GENOA,I-16146 GENOA,ITALY

[6] UNIV CALIF IRVINE,IRVINE,CA 92717

[7] NORTHWESTERN UNIV,EVANSTON,IL 60208

[8] UNIV TURIN,I-10125 TURIN,ITALY

[9] IST NAZL FIS NUCL,I-10125 TURIN,ITALY

来源：

PHYSICAL REVIEW D | 1996年 / 54卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.54.7067

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the first observation of the (radiative) decay J/psi-->e(+)e(-)gamma. Our data are from an experiment in which J/psi is formed in antiproton-proton annihilations. The observed rate is consistent with a QED calculation based on final state radiation. Our measurement gives a branching ratio for this mode of (8.8 +/- 1.3 +/- 0.4) x 10(-3) for gamma energy > 100 MeV.

引用

页码：7067 / 7070

页数：4

共 14 条

[1] MEASUREMENT OF THE J/PSI AND PSI' RESONANCE PARAMETERS IN (P)OVER-BAR ANNIHILATION
ARMSTRONG, TA
BETTONI, D
BHARADWAJ, V
BIINO, C
BORREANI, G
BROEMMELSIEK, D
BUZZO, A
CALABRESE, R
CECCUCCI, A
CESTER, R
CHURCH, MD
DALPIAZ, P
DALPIAZ, PF
DIBENEDETTO, R
DIMITROYANNIS, D
FABBRI, M
FAST, JE
GIANOLI, A
GINSBURG, CM
GOLLWITZER, KE
HAHN, AA
HASAN, MA
HSUEH, SY
LEWIS, RA
LUPPI, E
MACRI, M
MAJEWSKA, A
MANDELKERN, MA
MARCHETTO, F
MARINELLI, M
MARQUES, JL
MARSH, W
MARTINI, M
MASUZAWA, M
MENICHETTI, E
MIGLIORI, A
MUSSA, R
PALESTINI, S
PALLAVICINI, M
PASSAGGIO, S
PASTRONE, N
PATRIGNANI, C
PEOPLES, J
PESANDO, L
PETRUCCI, F
PIA, MG
PORDES, S
RAPIDIS, PA
RAY, RE
REID, JD
[J]. PHYSICAL REVIEW D, 1993, 47 (03): : 772 - 783
[2] PROTON ELECTROMAGNETIC FORM-FACTORS IN THE TIME-LIKE REGION FROM 8.9 TO 13.0 GEV(2)
ARMSTRONG, TA
BETTONI, D
BHARADWAJ, V
BIINO, C
BORREANI, G
BROEMMELSIEK, D
BUZZO, A
CALABRESE, R
CECCUCCI, A
CESTER, R
CHURCH, MD
DALPIAZ, P
DALPIAZ, PF
DIBENEDETTO, R
DIMITROYANNIS, D
FABBRI, M
FAST, JE
GIANOLI, A
GINSBURG, CM
GOLLWITZER, KE
HAHN, AA
HASAN, MA
HSUEH, SY
LEWIS, RA
LUPPI, E
MACRI, M
MAJEWSKA, A
MANDELKERN, MA
MARCHETTO, F
MARINELLI, M
MARQUES, JL
MARSH, W
MARTINI, M
MASUZAWA, M
MENICHETTI, E
MIGLIORI, A
MUSSA, R
PALESTINI, S
PALLAVICINI, M
PASTRONE, N
PATRIGNANI, C
PEOPLES, J
PESANDO, L
PETRUCCI, F
PIA, MG
PORDES, S
RAPIDIS, PA
RAY, RE
REID, JD
RINAUDO, G
[J]. PHYSICAL REVIEW LETTERS, 1993, 70 (09) : 1212 - 1215
[3] THE E760 LEAD-GLASS CENTRAL CALORIMETER - DESIGN AND INITIAL TEST-RESULTS
BARTOSZEK, L
BHARADWAJ, V
CHURCH, MD
HAHN, AA
PEOPLES, J
PORDES, SH
RAPIDIS, PA
WERKEMA, SJ
AGAHI, D
BROEMMELSIEK, DR
FAST, JE
GEE, M
GOLLWITZER, KE
MANDELKERN, MA
MARQUES, JL
SCHULTZ, J
WEBER, MF
GINSBURG, CM
MASUZAWA, M
RAY, RE
ROSEN, JL
TROKENHEIM, S
ZHAO, JL
ARMSTRONG, TA
HUFFORD, GE
LEWIS, RA
MAJEWSKA, AM
REID, JD
SMITH, GA
HASAN, MA
BIINO, C
PALESTINI, S
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1991, 301 (01) : 47 - 60
[4] A LARGE ACCEPTANCE THRESHOLD CHERENKOV COUNTER FOR EXPERIMENT-760 AT FERMILAB
BIINO, C
BORREANI, G
CECCUCCI, A
CESTER, R
DUGHERA, G
GIRAUDO, G
MARCHETTO, F
MENICHETTI, E
MIGLIORI, A
MUSSA, R
PALESTINI, S
PASTRONE, N
PESANDO, L
RINAUDO, G
MANDELKERN, MA
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1992, 317 (1-2) : 135 - 142
[5] Note on the radiation field of the electron
Bloch, F
Nordsieck, A
[J]. PHYSICAL REVIEW, 1937, 52 (02): : 54 - 59
[6] THE EXPERIMENTAL-STUDY OF THE PI(-)-]E-VBARGAMMA-DECAY IN FLIGHT
BOLOTOV, VN
GNINENKO, SN
DJILKIBAEV, RM
ISAKOV, VV
KLUBAKOV, YM
LAPTEV, VD
LOBASHEV, VM
MARIN, VN
POBLAGUEV, AA
POSTOEV, VE
TOROPIN, AN
[J]. PHYSICS LETTERS B, 1990, 243 (03) : 308 - 312
[7] Brown J. S., 1984, THESIS U WASHINGTON
[8] A CYLINDRICAL MWPC AND RADIAL PROJECTION CHAMBER FOR THE E760 EXPERIMENT
CALABRESE, R
CARASSITI, V
DALPIAZ, P
DALPIAZ, PF
LUPPI, E
MARTINI, M
PALESTINI, S
PETRUCCI, F
SAVRIE, M
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1989, 277 (01) : 116 - 120
[9] EXPERIMENTAL RESULTS ON THE RADIATIVE PI-MU DECAY
CASTAGNOLI, C
MUCHNIK, M
[J]. PHYSICAL REVIEW, 1958, 112 (05): : 1779 - 1784
[10] *CERN PROGR LIB LO, 1994, GEANT DET DESCR SIM

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