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

页码：35 / 54

页数：20

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