Measurement of the χc2 polarization in ψ(2S)→γχc2 -: art. no. 092004

被引：13

作者：

Ablikim, M ^{[1
]}

Bai, JZ

Ban, Y

Bian, JG

Cai, X

Chang, JF

Chen, HF

Chen, HS

Chen, HX

Chen, JC

Chen, J

Chen, ML

Chen, YB

Chi, SP

Chu, YP

Cui, XZ

Dai, HL

Dai, YS

Deng, ZY

Dong, LY

Du, SX

Du, ZZ

Fang, J

Fang, SS

Fu, CD

Fu, HY

Gao, CS

Gao, YN

Gong, MY

Gong, WX

Gu, SD

Guo, YN

Guo, YQ

Guo, ZJ

Harris, FA

He, KL

He, M

He, X

Heng, YK

Hu, HM

Hu, T

Huang, GS

Huang, L

Huang, XP

Ji, XB

Jia, QY

Jiang, CH

Jiang, XS

Jin, DP

机构：

[1] Inst High Energy Phys, Beijing 100039, Peoples R China

[2] CCAST, Beijing 100080, Peoples R China

[3] Guangxi Normal Univ, Guilin 541004, Peoples R China

[4] Henan Normal Univ, Xinxiang 453002, Peoples R China

[5] Huazhong Normal Univ, Wuhan 430079, Peoples R China

[6] Hunan Univ, Changsha 410082, Peoples R China

[7] Liaoning Univ, Shenyang 110036, Peoples R China

[8] Nanjing Normal Univ, Nanjing 210097, Peoples R China

[9] Nankai Univ, Tianjin 300071, Peoples R China

[10] Peking Univ, Beijing 100871, Peoples R China

[11] Shandong Univ, Jinan 250100, Peoples R China

[12] Shanghai Jiao Tong Univ, Shanghai 200030, Peoples R China

[13] Sichuan Univ, Chengdu 610064, Peoples R China

[14] Tsinghua Univ, Beijing 100084, Peoples R China

[15] Univ Hawaii, Honolulu, HI 96822 USA

[16] Univ Sci & Technol China, Anhua 230026, Peoples R China

[17] Wuhan Univ, Wuhan 430072, Peoples R China

[18] Zhejiang Univ, Hangzhou 310028, Peoples R China

来源：

PHYSICAL REVIEW D | 2004年 / 70卷 / 09期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1103/PhysRevD.70.092004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The polarization of the chi(c2) produced in psi(2S) decays into gammachi(c2) is measured using a sample of 14x10(6)psi(2S) events collected by the BESII detector at the BEPC storage ring. A fit to the chi(c2) production and decay angular distributions in psi(2S)-->gammachi(c2), chi(c2)-->pi(+)pi(-) and K+K- yields values x=A(1)/A(0)=2.08+/-0.44 and y=A(2)/A(0)=3.03+/-0.66, with a correlation rho=0.92 between them, where A(0,1,2) are the chi(c2) helicity amplitudes. The measurement agrees with a pure E1 transition, and M2 and E3 contributions do not differ significantly from zero.

引用

页码：092004 / 1

页数：7

共 25 条

[1]

Ablikim M, 2004, PHYS REV D, V70, DOI [10.1103/PhysRevD.70.112003, 10.1103/PhysRevD.70.092003]

[2] THE BES DETECTOR [J].

BAI, JZ ;

BIAN, Q ;

CHEN, GM ;

CHEN, LJ ;

CHEN, SN ;

CHEN, YQ ;

CHEN, ZQ ;

CHI, YK ;

CUI, HC ;

CUI, XZ ;

DENG, SS ;

DENG, YW ;

DING, HL ;

DONG, BZ ;

DONG, XS ;

DU, X ;

DU, ZZ ;

FENG, C ;

FENG, Z ;

FU, ZS ;

GAO, CS ;

GAO, ML ;

GAO, SQ ;

GAO, WX ;

GAO, YN ;

GU, SD ;

GU, WX ;

GUAN, YZ ;

GUO, HF ;

GUO, YN ;

GUO, YY ;

HAN, SW ;

HAN, Y ;

HAO, W ;

HE, J ;

HE, KR ;

HE, MJ ;

HOU, XJ ;

HU, GY ;

HU, JS ;

HU, JW ;

HUANG, DQ ;

HUANG, YZ ;

JIA, QP ;

JIANG, CH ;

JU, Q ;

LAI, YF ;

LANG, PF ;

LI, DS ;

LI, F .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1994, 344 (02) :319-334

[3] The BES upgrade [J].

Bai, JZ ;

Bao, HC ;

Blum, I ;

Chai, ZW ;

Chen, GP ;

Chen, HF ;

Chen, J ;

Chen, JC ;

Chen, Y ;

Chen, YB ;

Chen, YQ ;

Cheng, BS ;

Chu, XM ;

Cui, XZ ;

Ding, HL ;

Ding, WY ;

Dong, LY ;

Du, YY ;

Du, ZZ ;

Dunwoodie, W ;

Fang, J ;

Fang, WZ ;

Gao, CS ;

Gao, ML ;

Gao, SQ ;

Gratton, P ;

Gu, JH ;

Gu, SD ;

Gu, WX ;

Guo, YN ;

Han, HG ;

Han, SW ;

Harris, FA ;

Han, Y ;

He, J ;

He, M ;

Heng, YK ;

Hitlin, DG ;

Hu, GY ;

Hu, HB ;

Hu, HM ;

Hu, JL ;

Hu, QH ;

Hu, T ;

Hu, XQ ;

Huang, GS ;

Huang, JD ;

Huang, YZ ;

Izen, JM ;

Jiang, CH .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2001, 458 (03) :627-637

[4]

Bai JZ, 1998, PHYS REV D, V58, DOI 10.1103/PhysRevD.58.092006

[5]

BAI JZ, 1996, HIGH ENERG PHYS NUC, V20, P97

[6] ALPHA-3-CONTRIBUTION TO ANGULAR ASYMMETRY IN E+E- -] MU+MU- [J].

BERENDS, FA ;

GAEMERS, KJF ;

GASTMANS, R .

NUCLEAR PHYSICS B, 1973, B 63 (OCT22) :381-397

[7]

BERENDS FA, 1974, NUCL PHYS B, VB 75, P546

[8] HARD PHOTON CORRECTIONS FOR PROCESS E+E- -]MU+1-MU-1+ [J].

BERENDS, FA ;

GAEMERS, KJF ;

GASTMANS, R .

NUCLEAR PHYSICS B, 1973, B 57 (02) :381-400

[9] DISTRIBUTIONS IN THE PROCESS E+E--]E+E-(GAMMA) [J].

BERENDS, FA ;

KLEISS, R .

NUCLEAR PHYSICS B, 1983, 228 (03) :537-551

[10] ANGULAR-DISTRIBUTION OF PHOTONS IN THE PARITY-CHANGING ONE-PHOTON RADIATIVE DECAYS OF QUARKONIA [J].

DONCHESKI, MA ;

GROTCH, H ;

SEBASTIAN, KJ .

PHYSICAL REVIEW D, 1990, 42 (07) :2293-2299

← 1 2 3 →