GLOBAL QCD STUDY OF DIRECT PHOTON PRODUCTION

被引：94

作者：

HUSTON, J

KOVACS, E

KUHLMANN, S

LAI, HL

OWENS, JF

TUNG, WK

机构：

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

[2] FLORIDA STATE UNIV,TALLAHASSEE,FL 32306

[3] MICHIGAN STATE UNIV,E LANSING,MI 48824

来源：

PHYSICAL REVIEW D | 1995年 / 51卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.51.6139

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A global QCD analysis of the direct photon production process from both fixed target and collider experiments is presented. These data sets now completely cover the parton x range from 0.01 to 0.6, thereby providing a stringent test of perturbative QCD and parton distributions. Previous detailed studies of direct photons emphasized fixed target data. We find most data sets have a steeper pt distribution than the QCD prediction. Neither global fits with new parton distributions nor improved photon fragmentation functions can resolve this problem since the deviation occurs at different x values for experiments at different energies. A more likely explanation is the need for additional broadening of the kt of the initial state partons. The magnitude and the possible physical origin of this effect are investigated and discussed. © 1995 The American Physical Society.

引用

页码：6139 / 6145

页数：7

共 35 条

[1] PROMPT PHOTON CROSS-SECTION MEASUREMENT IN (P)OVER-BARP COLLISIONS AT ROOT-S = 1.8 TEV [J].

ABE, F ;

ALBROW, M ;

AMIDEI, D ;

ANWAYWIESE, C ;

APOLLINARI, G ;

ATAC, M ;

AUCHINCLOSS, P ;

AZZI, P ;

BADEN, AR ;

BACCHETTA, N ;

BADGETT, W ;

BAILEY, MW ;

BAMBERGER, A ;

DEBARBARO, P ;

BARBAROGALTIERI, A ;

BARNES, VE ;

BARNETT, BA ;

BAUER, G ;

BAUMANN, T ;

BEDESCHI, F ;

BEHRENDS, S ;

BELFORTE, S ;

BELLETTINI, G ;

BELLINGER, J ;

BENJAMIN, D ;

BENLLOCH, J ;

BENSINGER, J ;

BERETVAS, A ;

BERGE, JP ;

BERTOLUCCI, S ;

BIERY, K ;

BHADRA, S ;

BINKLEY, M ;

BISELLO, D ;

BLAIR, R ;

BLOCKER, C ;

BODEK, A ;

BOLOGNESI, V ;

BOOTH, AW ;

BOSWELL, C ;

BRANDENBURG, G ;

BROWN, D ;

BUCKLEYGEER, E ;

BUDD, HS ;

BUSETTO, G ;

BYONWAGNER, A ;

BYRUM, KL ;

CAMPAGNARI, C ;

CAMPBELL, M ;

CANER, A .

PHYSICAL REVIEW D, 1993, 48 (07) :2998-3025

[2] PRECISION-MEASUREMENT OF THE PROMPT PHOTON CROSS-SECTION IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8 TEV [J].

ABE, F ;

ALBROW, MG ;

AMIDEI, D ;

ANTOS, J ;

ANWAYWIESE, C ;

APOLLINARI, G ;

ARETI, H ;

ATAC, M ;

AUCHINCLOSS, P ;

AZFAR, F ;

AZZI, P ;

BACCHETTA, N ;

BADGETT, W ;

BAILEY, MW ;

BAO, J ;

DEBARBARO, P ;

BARBAROGALTIERI, A ;

BARNES, VE ;

BARNETT, BA ;

BARTALINI, P ;

BAUER, G ;

BAUMANN, T ;

BEDESCHI, F ;

BEHRENDS, S ;

BELFORTE, S ;

BELLETTINI, G ;

BELLINGER, J ;

BENJAMIN, D ;

BENLLOCH, J ;

BENSINGER, J ;

BENTON, D ;

BERETVAS, A ;

BERGE, JP ;

BERTOLUCCI, S ;

BHATTI, A ;

BIERY, K ;

BINKLEY, M ;

BIRD, F ;

BISELLO, D ;

BLAIR, RE ;

BLOCKER, C ;

BODEK, A ;

BOKHARI, W ;

BOLOGNESI, V ;

BORTOLETTO, D ;

BOSWELL, C ;

BOULOS, T ;

BRANDENBURG, G ;

BUCKLEYGEER, E ;

BUDD, HS .

PHYSICAL REVIEW LETTERS, 1994, 73 (20) :2662-2666

[3] MEASUREMENT OF THE ISOLATED PROMPT PHOTON CROSS-SECTION IN (P)BAR-P COLLISIONS AT ROOT-S = 1.8 TEV [J].

ABE, F ;

AMIDEI, D ;

APOLLINARI, G ;

ATAC, M ;

AUCHINCLOSS, P ;

BADEN, AR ;

BACCHETTA, N ;

BAILEY, MW ;

BAMBERGER, A ;

DEBARBARO, P ;

BARNETT, BA ;

BARBAROGALTIERI, A ;

BARNES, VE ;

BAUMANN, T ;

BEDESCHI, F ;

BEHRENDS, S ;

BELFORTE, S ;

BELLETTINI, G ;

BELLINGER, J ;

BENJAMIN, D ;

BENSINGER, J ;

BERETVAS, A ;

BERGE, JP ;

BERTOLUCCI, S ;

BHADRA, S ;

BINKLEY, M ;

BISELLO, D ;

BLAIR, R ;

BLOCKER, C ;

BODEK, A ;

BOLOGNESI, V ;

BOOTH, AW ;

BOSWELL, C ;

BRANDENBURG, G ;

BROWN, D ;

BUCKLEYGEER, E ;

BUDD, HS ;

BUSETTO, G ;

BYONWAGNER, A ;

BYRUM, KL ;

CAMPAGNARI, C ;

CAMPBELL, M ;

CANER, A ;

CAREY, R ;

CARITHERS, W ;

CARLSMITH, D ;

CARROLL, JT ;

CASHMORE, R ;

CASTRO, A ;

CERVELLI, F .

PHYSICAL REVIEW LETTERS, 1992, 68 (18) :2734-2738

[4] MEASUREMENT OF THE CROSS-SECTION FOR PRODUCTION OF 2 ISOLATED PROMPT PHOTONS IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8 TEV [J].

ABE, F ;

ALBROW, M ;

AMIDEI, D ;

ANWAYWIESE, C ;

APOLLINARI, G ;

ATAC, M ;

AUCHINCLOSS, P ;

AZZI, P ;

BADEN, AR ;

BACCHETTA, N ;

BADGETT, W ;

BAILEY, MW ;

BAMBERGER, A ;

DEBARBARO, P ;

BARBAROGALTIERI, A ;

BARNES, VE ;

BARNETT, BA ;

BAUER, G ;

BAUMANN, T ;

BEDESCHI, F ;

BEHRENDS, S ;

BELFORTE, S ;

BELLETTINI, G ;

BELLINGER, J ;

BENJAMIN, D ;

BENLLOCH, J ;

BENSINGER, J ;

BERETVAS, A ;

BERGE, JP ;

BERTOLUCCI, S ;

BIERY, K ;

BHADRA, S ;

BINKLEY, M ;

BISELLO, D ;

BLAIR, R ;

BLOCKER, C ;

BODEK, A ;

BOLOGNESI, V ;

BOOTH, AW ;

BOSWELL, C ;

BRANDENBURG, G ;

BROWN, D ;

BUCKLEYGEER, E ;

BUDD, HS ;

BUSETTO, G ;

BYONWAGNER, A ;

BYRUM, KL ;

CAMPAGNARI, C ;

CAMPBELL, M ;

CANER, A .

PHYSICAL REVIEW LETTERS, 1993, 70 (15) :2232-2236

[5] A MEASUREMENT OF THE DIRECT PHOTON PRODUCTION CROSS-SECTION AT THE CERN PBARP COLLIDER [J].

ALITTI, J .

PHYSICS LETTERS B, 1991, 263 (3-4) :544-550

[6] VECTOR BOSON PRODUCTION AT COLLIDERS - A THEORETICAL REAPPRAISAL [J].

ALTARELLI, G ;

ELLIS, RK ;

GRECO, M ;

MARTINELLI, G .

NUCLEAR PHYSICS B, 1984, 246 (01) :12-44

[7] PRODUCTION OF DIRECT PHOTONS AND NEUTRAL MESONS AT LARGE TRANSVERSE-MOMENTA BY BETA- AND P BEAMS AT 500-GEV/C [J].

ALVERSON, G ;

BAKER, WF ;

BALLOCCHI, G ;

BENSON, R ;

BERG, D ;

BLUSK, S ;

BROMBERG, C ;

BROWN, D ;

CAREY, D ;

CHAND, T ;

CHANDLEE, C ;

CHOUDHARY, BC ;

CHUNG, WH ;

DEBARBARO, L ;

DESOI, W ;

DLUGOSZ, W ;

DUNLEA, J ;

EASO, S ;

ENGELS, E ;

FAISSLER, W ;

FANOURAKIS, G ;

FERBEL, T ;

GARELICK, D ;

GINTHER, G ;

GLASS, G ;

GLAUBMAN, M ;

GUTIERREZ, P ;

HARTMAN, K ;

HUSTON, J ;

JOHNSTONE, C ;

KAPOOR, V ;

KOURBANIS, I ;

LANARO, A ;

LIRAKIS, C ;

LOBKOWICZ, F ;

LUKENS, P ;

MANI, S ;

MAUL, A ;

MANSOUR, J ;

MILLER, R ;

NELSON, CA ;

OH, BY ;

ORRIS, D ;

POTHIER, E ;

PREBYS, E ;

RAJARAM, BM ;

ROSER, R ;

RUDDICK, K ;

SHEPARD, P ;

SHIVPURI, RK .

PHYSICAL REVIEW D, 1993, 48 (01) :5-28

[8] HIGH-PT DIRECT PHOTON PRODUCTION IN PP COLLISIONS [J].

ANASSONTZIS, E ;

KARABARBOUNIS, A ;

KOURKOUMELIS, C ;

RESVANIS, LK ;

PALMER, RB ;

RAHM, DC ;

REHAK, P ;

STUMER, I ;

FABJAN, CW ;

FERBEL, T ;

LISSAUER, D ;

MANNELLI, I ;

MOLZON, W ;

MOUZOURAKIS, P ;

NAPPI, A ;

ROSSO, E ;

WILLIS, W .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1982, 13 (04) :277-289

[9] GLUON CONTENT OF THE NUCLEON PROBED WITH REAL AND VIRTUAL PHOTONS [J].

AURENCHE, P ;

BAIER, R ;

FONTANNAZ, M ;

OWENS, JF ;

WERLEN, M .

PHYSICAL REVIEW D, 1989, 39 (11) :3275-3286

[10] NEXT-TO-LEADING ORDER BREMSSTRAHLUNG CONTRIBUTION TO PROMPT-PHOTON PRODUCTION [J].

AURENCHE, P ;

CHIAPPETTA, P ;

FONTANNAZ, M ;

GUILLET, JP ;

PILON, E .

NUCLEAR PHYSICS B, 1993, 399 (01) :34-62

← 1 2 3 4 →