MEASUREMENT OF THE TOTAL HADRONIC CROSS-SECTION IN TAGGED GAMMA-GAMMA REACTIONS

被引：48

作者：

AIHARA, H

ALSTONGARNJOST, M

AVERY, RE

BARKER, AR

BAUER, DA

BAY, A

BELCINSKI, R

BINGHAM, HH

BLOOM, ED

BUCHANAN, CD

CALDWELL, DO

CHAO, HY

CHUN, SB

CLARK, AR

COWAN, GD

CRANE, DA

DAHL, OI

ERNE, FC

FAIRFIELD, KH

FRIDMAN, A

GODFREY, G

HAUPTMAN, JM

HO, C

HOFMANN, W

KAMAE, T

KENNEY, RW

KHACHERYAN, S

KOFLER, RR

LAMBERT, DJ

LANGEVELD, WGJ

LAYTER, JG

LIN, WT

LINDE, FL

LOKEN, SC

LU, A

LYNCH, GR

LYS, JE

MADARAS, RJ

MAGNUSON, BD

MARSISKE, H

MASEK, GE

MATHIS, LG

MAXFIELD, SJ

MCNEIL, RR

MILLER, ES

NICOL, NA

NYGREN, DR

ODDONE, PJ

OH, H

OYANG, YT

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011

[2] UNIV CALIF BERKELEY,BERKELEY,CA 94720

[3] UNIV CALIF DAVIS,DAVIS,CA 95616

[4] UNIV CALIF STANFORD,INTERCAMPUS INST RES PARTICLE ACCELERATORS,STANFORD,CA 94305

[5] UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024

[6] UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521

[7] UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093

[8] UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106

[9] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720

[10] UNIV MASSACHUSETTS,AMHERST,MA 01003

[11] MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY

[12] NATL INST NUCL & HIGH ENERGY PHYS,AMSTERDAM,NETHERLANDS

[13] STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309

来源：

PHYSICAL REVIEW D | 1990年 / 41卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.41.2667

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of the total cross section for hadrons, with one photon quasireal and the other a spacelike photon of mass squared -Q2. Results are presented as a function of Q2 and the center-of-mass energy W, with the Q2 range extending from 0.2 to 60 GeV2, and W in the range from 2 to 10 GeV. The data were taken with the TPC/Two-Gamma facility at the SLAC e+e- storage ring PEP, which was operated at a beam energy of 14.5 GeV. The cross section exhibits a gentle falloff with increasing W. Its Q2 dependence is shown to be well described by an incoherent sum of vector-meson and pointlike scattering over most of the observed W range. Agreement at high Q2 is improved if a minimum-pT cutoff (motivated by QCD) is imposed on the pointlike contribution. © 1990 The American Physical Society.

引用

页码：2667 / 2674

页数：8

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