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Titolo:
MEASUREMENT OF THE DOUBLE-SPIN ASYMMETRY A(LL) FOR INCLUSIVE MULTI-GAMMA PAIR PRODUCTION WITH 200-GEV C POLARIZED PROTON-BEAM AND POLARIZEDPROTON TARGET/
Autore:
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; READ AL; ROBERTS JB; VANROSSUM L; RYKOV VL; SAITO N; SALVATO G; SCHIAVON P; SHEPARD J; SKEENS J; SOLOVYANOV VL; SPINKA H; TAKASHIMA R; TAKEUTCHI F; TAMURA N; TANAKA N; UNDERWOOD DG; VASILIEV AN; VILLARI A; WHITE JL; YAMASHITA S; YOKOSAWA A; YOSHIDA T; ZANETTI A;
Indirizzi:
RICE UNIV,TW BONNER NUCL LAB HOUSTON TX 77251 UNIV IOWA,DEPT PHYS IOWA CITY IA 52242 MOSCOW INST HIGH ENERGY PHYS PROTOVINO 142284 RUSSIA CENS F-91191 GIF SUR YVETTE FRANCE FERMILAB NATL ACCELERATOR LAB BATAVIA IL 60510 KYOTO UNIV,DEPT PHYS KYOTO 606 JAPAN MEIJI COLL ORIENTAL MED KYOTO 62903 JAPAN ARGONNE NATL LAB ARGONNE IL 60439 HIROSHIMA UNIV HIROSHIMA 724 JAPAN NORTHEASTERN STATE UNIV TAHLEQUAH OK 74464 LAB PHYS PARTICULES F-74017 ANNECY LE VIEUX FRANCE NORTHWESTERN UNIV,DEPT PHYS EVANSTON IL 60201 UNIV OCCUPAT & ENVIRONM HLTH KITAKYUSHU FUKUOKA 807 JAPAN UNIV UDINE I-33100 UDINE ITALY UNIV TRIESTE,DIPARTIMENTO FIS I-34100 TRIESTE ITALY UNIV MESSINA,DIPARTIMENTO FIS I-34100 MESSINA ITALY KYOTO UNIV KYOTO 612 JAPAN KYOTO SANGYO UNIV KYOTO 612 JAPAN OKAYAMA UNIV OKAYAMA 700 JAPAN LOS ALAMOS NATL LAB LOS ALAMOS NM 87545 OSAKA CITY UNIV OSAKA 558 JAPAN
Titolo Testata:
Physics letters. Section B
fascicolo: 2, volume: 336, anno: 1994,
pagine: 269 - 274
SICI:
0370-2693(1994)336:2<269:MOTDAA>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
LARGE TRANSVERSE-MOMENTUM; DIRECT PHOTON PRODUCTION; PI-0 PRODUCTION; PP COLLISIONS; 300 GEV/C; DEPENDENCE; SCATTERING; NUCLEON; HADRON; PI+P;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
D.L. Adams et al., "MEASUREMENT OF THE DOUBLE-SPIN ASYMMETRY A(LL) FOR INCLUSIVE MULTI-GAMMA PAIR PRODUCTION WITH 200-GEV C POLARIZED PROTON-BEAM AND POLARIZEDPROTON TARGET/", Physics letters. Section B, 336(2), 1994, pp. 269-274

Abstract

The invariant double-differential cross section, E1E2d6 delta/dp(1)3dp(2)3, and the double-spin asymmetry, A(LL), for inclusive multi-gammapair 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.

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Documento generato il 27/11/20 alle ore 09:28:58