ADAMS, DL and AKCHURIN, N and BELIKOV, NI and BRAVAR, A and BYSTRICKY, J and CHAUMETTE, P and CORCORAN, MD and COSSAIRT, JD and CRANSHAW, J and DEREGEL, J and DEREVSCHIKOV, AA and DURAND, G and ENYO, H and FABRE, J and FUKUDA, K and FUNAHASHI, H and GOTO, Y and GRACHOV, OA and GROSNICK, DP and HILL, DA and IIJIMA, T and IMAI, K and ITOW, Y and IWATANI, K and KASPRZYK, T and KRUEGER, KW and KURODA, K and LAGHAI, M and LEHAR, F and DELESQUEN, A and LOPIANO, D and LUEHRING, FC and MAKI, T and MAKINO, S and MASAIKE, A and MATULENKO, YA and MESCHANIN, AP and MICHALOWICZ, A and MILLER, DH and MIYAKE, K and NAGAMINE, T and NESSITEDALDI, F and NESSI, M and NGUYEN, C and NURUSHEV, SB and OHASHI, Y and ONEL, Y and PATALAKHA, DI and PAULETTA, G and PENZO, A and READ, AL and ROBERTS, JB and VANROSSUM, L and RYKOV, VL and SAITO, N and SALVATO, G and SCHIAVON, P and SHEPARD, J and SKEENS, J and SOLOVYANOV, VL and SPINKA, H and TAKASHIMA, R and TAKEUTCHI, F and TAMURA, N and TANAKA, N and UNDERWOOD, DG and VASILIEV, AN and VILLARI, A and WHITE, JL and YAMASHITA, S and YOKOSAWA, A and YOSHIDA, T and ZANETTI, A (1994) 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. PHYS LETT B , 336 (2) 269 - 274.
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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.
|Title:||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|
|Keywords:||LARGE TRANSVERSE-MOMENTUM, DIRECT PHOTON PRODUCTION, PI-0 PRODUCTION, PP COLLISIONS, 300 GEV/C, DEPENDENCE, SCATTERING, NUCLEON, HADRON, PI+P|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy|
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