Published October 2001 | Version v1
Book Metadata-only

Double-Tag Events in Two-Photon Collisions at L3 Experiment

Creators

Description

Double-tag events in two-photon collisions are studied using the L3 detector at LEP with centre-of-mass energies from √s = 189 GeV to √s = 209 GeV. The cross-sections of e+e- → e+e- hadrons and γ*γ* → hadrons are given as a function of the photon virtualities, Q21and Q22, of the two-photon mass, Wγγ, and of the variable Y = Ln(W2γγ/Q1Q2) for an average photon virtuality [Q2] = 16 GeV2. The results are in agreement with NLO calculations for the QPM process in the interval 2 ≤ Y ≤ 5. An excess is observed in the interval 5 ≤ Y ≤ 7, corresponding to Wγγ greater than 40 GeV. The PHOJET Monte Carlo describes the data reasonably well. (author)

Part of:
Photon 2001 - Ascona (Switzerland)

Additional details

Publishing Information

Publisher
Photon
Imprint Place
Geneva (Switzerland)
ISBN
3-905592-11-8
Imprint Title
Photon 2001 - Ascona (Switzerland)
Imprint Pagination
220 p.
Journal Page Range
p. 1

Conference

Title
Conference on the Structure and Interactions of the Photon
Dates
2-7 Sep 2001
Place
Ascona (Switzerland)

INIS

Country of Publication
Switzerland
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
35013871
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
COMPARATIVE EVALUATIONS; ELECTRON-POSITRON INTERACTIONS; EXPERIMENTAL DATA; GEV RANGE 100-1000; JET MODEL; LEP STORAGE RINGS; MONTE CARLO METHOD; MULTIPARTICLE SPECTROMETERS; MULTIPLE PRODUCTION; NUMERICAL DATA; PARTON MODEL; PHOTON-PHOTON INTERACTIONS; PHOTONS; QUARK MODEL; VIRTUAL PARTICLES
Descriptors DEC
ACCELERATORS; BASIC INTERACTIONS; BOSONS; CALCULATION METHODS; COMPOSITE MODELS; CYCLIC ACCELERATORS; DATA; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; EVALUATION; GEV RANGE; INFORMATION; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; MASSLESS PARTICLES; MATHEMATICAL MODELS; MEASURING INSTRUMENTS; NUMERICAL DATA; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PRODUCTION; SPECTROMETERS; STORAGE RINGS; SYNCHROTRONS

Optional Information