STUDY OF THE CHI-1 AND CHI-2 CHARMONIUM STATES FORMED IN (P)BAR-P ANNIHILATIONS

被引：57
作者：
ARMSTRONG, TA
BETTONI, D
BHARADWAJ, V
BIINO, C
BORREANI, G
BROEMMELSIEK, DR
BUZZO, A
CALABRESE, R
CECCUCCI, A
CESTER, R
CHURCH, MD
DALPAIZ, P
DALPIAZ, PF
DAMERI, M
DIMITROYANNIS, D
FABBRI, M
FAST, JE
FERRONI, S
GEE, M
GINSBURG, CM
GOLLWITZER, KE
HAHN, AA
HASAN, MA
HSUEH, SY
LEWIS, RA
LUPPI, E
MACRI, M
MAJEWSKA, AM
MANDELKERN, MA
MARCHETTO, F
MARINELLI, M
MARQUES, JL
MARSH, W
MARTINI, M
MASUZAWA, M
MENICHETTI, E
MIGLIORI, A
MUSSA, R
PALESTINI, S
PASTRONE, N
PATRIGNANI, C
PEOPLES, J
PESANDO, L
PETRUCCI, F
PIA, MG
PORDES, S
RAPIDIS, PA
RAY, RE
REID, JD
RINAUDO, G
机构：
[1] UNIV GENOA,I-16146 GENOA,ITALY
[2] NORTHWESTERN UNIV,EVANSTON,IL 60208
[3] IST NAZL FIS NUCL,TURIN,ITALY
[4] FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510
[5] UNIV FERRARA,I-44100 FERRARA,ITALY
[6] UNIV CALIF IRVINE,IRVINE,CA 92717
[7] UNIV TURIN,I-10125 TURIN,ITALY
[8] IST NAZL FIS NUCL,FERRARA,ITALY
来源：
NUCLEAR PHYSICS B | 1992年 / 373卷 / 01期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1016/0550-3213(92)90448-K
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We report on a study of the chi-1(P-3(1)) and chi-2(P-3(2)) states of charmonium formed in antiproton-proton annihilations. An energy scan through the resonances, performed with a very narrow momentum-band beam of antiprotons intersecting a hydrogen jet target, enables us to perform very precise measurements of the mass and the total width of the two resonances. From a sample of 513-chi-1 and 585-chi-2 events, we find M(chi-1) = (3510.53 +/- 0. 13) MeV/c2, M(chi-2) = (3556.15 +/- 0.14) MeV/c2, GAMMA(chi-1) = (0-88 +/- 0.14) MeV and GAMMA(chi-2) = (1.98 +/- 0.18) MeV. From our measurement of the quantity GAMMA(R --> ppBAR) X BR(R --> J/psi-gamma) x BR(J/psi --> e+ e-), using known branching ratios, we obtain GAMMA(chi-1 --> ppBAR) = (69 +/- 13) eV and GAMMA(chi-2 --> ppBAR) = (180 +/- 31) eV.
引用
收藏
页码：35 / 54
页数：20
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