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

Authors
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
Citation
Dl. 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
Citations number
31
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
336
Issue
2
Year of publication
1994
Pages
269 - 274
Database
ISI
SICI code
0370-2693(1994)336:2<269:MOTDAA>2.0.ZU;2-7
Abstract
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 meas ured with a 200 GeV/c longitudinally-polarized proton beam and a longi tudinally-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 packag e with the Carlitz-Kaur model of spin dependent distribution functions of valence quarks, the A(LL) values have been compared with theoretic al predictions of gluon polarization, DELTAG/G. The results put restri ctions on the size of DELTAG/G in the region of 0.05 less-than-or-simi lar-to x less-than-or-similar-to 0.35.