Jet production in {gamma}{gamma} interactions at PEP

Conference · Sat Dec 31 04:00:00 EST 1988

OSTI ID:10184348

We have used the TPC/Two-Gamma Facility at the SLAC e{sup +}e{sup {minus}} storage ring PEP to study the photon-photon reaction e{sup +}e{sup {minus}} {yields} e{sup +}e{sup {minus}} + hadrons, in both the single-tagged mode (one outgoing e{sup {plus_minus}} detected) and the untagged mode (neither e{sup {plus_minus}} detected). A thrust algorithm was used to find the jet axis in the hadronic center-of-mass, and this axis was used to calculate the transverse momentum with respect to the {gamma}{gamma} collision axis (p{sub t}). The (preliminary) p{sub t} and thrust distributions of both tagged and untagged data are well-described by the predictions of vector meson dominance (VDM) at low p{sub t}. For 3 < p{sub t} < 4.5 GeV, the tagged data are consistent with the prediction of the Quark Parton Model (QPM). In the intermediate region -- 1.5 < p{sub t} < 3 GeV -- an excess of events is seen in both samples. The p{sub t} and event topology of these excess events are compared to a 3-jet model based on QCD.

• Research Organization: Massachusetts Univ., Amherst, MA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: AC02-85ER40194
• OSTI ID: 10184348
• Report Number(s): CONF-880867--28; ON: DE93019136
• Country of Publication: United States
• Language: English

Related Subjects

662390
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
ELECTROMAGNETIC PROCESSES AND PROPERTIES
ELECTRON-POSITRON INTERACTIONS
JET MODEL
PARTICLE PRODUCTION
PEP STORAGE RINGS
PHOTON-PHOTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUARK MODEL
STRUCTURE FUNCTIONS
TIME PROJECTION CHAMBERS
TRANSVERSE MOMENTUM