MEASUREMENT OF THE DOUBLE-SPIN ASYMMETRY A(LL) FOR INCLUSIVE MULTI-GAMMA PAIR PRODUCTION WITH 200-GEV/C POLARIZED PROTON-BEAM AND POLARIZED PROTON TARGET

被引：25

作者：

ADAMS, DL

AKCHURIN, N

BELIKOV, NI

BRAVAR, A

BYSTRICKY, J

CHAUMETTE, P

CORCORAN, MD

COSSAIRT, JD

CRANSHAW, J

DEREGEL, J

DEREVSCHIKOV, AA

DURAND, G

ENYO, H

FABRE, J

FUKUDA, K

FUNAHASHI, H

GOTO, Y

GRACHOV, OA

GROSNICK, DP

HILL, DA

IIJIMA, T

IMAI, K

ITOW, Y

IWATANI, K

KASPRZYK, T

KRUEGER, KW

KURODA, K

LAGHAI, M

LEHAR, F

DELESQUEN, A

LOPIANO, D

LUEHRING, FC

MAKI, T

MAKINO, S

MASAIKE, A

MATULENKO, YA

MESCHANIN, AP

MICHALOWICZ, A

MILLER, DH

MIYAKE, K

NAGAMINE, T

NESSITEDALDI, F

NESSI, M

NGUYEN, C

NURUSHEV, SB

OHASHI, Y

ONEL, Y

PATALAKHA, DI

PAULETTA, G

PENZO, A

机构：

[1] UNIV IOWA,DEPT PHYS,IOWA CITY,IA 52242

[2] MOSCOW INST HIGH ENERGY PHYS,PROTOVINO 142284,RUSSIA

[3] CENS,F-91191 GIF SUR YVETTE,FRANCE

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

[5] KYOTO UNIV,DEPT PHYS,KYOTO 606,JAPAN

[6] MEIJI COLL ORIENTAL MED,KYOTO 62903,JAPAN

[7] ARGONNE NATL LAB,ARGONNE,IL 60439

[8] HIROSHIMA UNIV,HIROSHIMA 724,JAPAN

[9] NORTHEASTERN STATE UNIV,TAHLEQUAH,OK 74464

[10] LAB PHYS PARTICULES,F-74017 ANNECY LE VIEUX,FRANCE

[11] NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60201

[12] UNIV OCCUPAT & ENVIRONM HLTH,KITAKYUSHU,FUKUOKA 807,JAPAN

[13] UNIV UDINE,I-33100 UDINE,ITALY

[14] UNIV TRIESTE,DIPARTIMENTO FIS,I-34100 TRIESTE,ITALY

[15] UNIV MESSINA,DIPARTIMENTO FIS,I-34100 MESSINA,ITALY

[16] KYOTO UNIV,KYOTO 612,JAPAN

[17] KYOTO SANGYO UNIV,KYOTO 612,JAPAN

[18] OKAYAMA UNIV,OKAYAMA 700,JAPAN

[19] LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545

[20] OSAKA CITY UNIV,OSAKA 558,JAPAN

来源：

PHYSICS LETTERS B | 1994年 / 336卷 / 02期

关键词：

D O I：

10.1016/0370-2693(94)00998-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The invariant double-differential cross section, E1E2d6 delta/dp(1)3dp(2)3, and the double-spin asymmetry, A(LL), for inclusive multi-gamma pair production in which gamma-rays came from neutral mesons were measured with a 200 GeV/c longitudinally-polarized proton beam and a longitudinally-polarized proton target. Most of the multi-gamma pairs comes from two-jet type events which are sensitive to partonic interaction. The A(LL) values were found to be consistent with zero. The invariant double-differential cross section for inclusive pi0pi0 production was also measured. These measured cross sections are consistent with LUND Monte Carlo simulations. Using the LUND Monte Carlo simulation package with the Carlitz-Kaur model of spin dependent distribution functions of valence quarks, the A(LL) values have been compared with theoretical predictions of gluon polarization, DELTAG/G. The results put restrictions on the size of DELTAG/G in the region of 0.05 less-than-or-similar-to x less-than-or-similar-to 0.35.

引用

页码：269 / 274

页数：6

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