Author: Gary S. GreenbaumPublisher:
ISBN:
Category :
Languages : en
Pages : 264
Book Description
Two-photon Exclusive Production of Charged Pion and Kaon Pairs
Author: Gary S. GreenbaumTwo Photon Exclusive Production of Charged Pion and Kaon Pairs
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Book Description
Two-photon exclusive hadron production at large momentum transfer probes the short distance physics of perturbative Quantum Chromodynamics and explores the long distance physics of bound-state quark dynamics. The differential cross section is measured for the exclusive reactions?? →??− and?? → K+K− in the two-photon invariant mass region 1.4 ≤M{sub?{gamma}}
EXCLUSIVE production of pion and kaon meson pairs in two photon collisions at LEP
Author: The ALEPH CollaborationPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Measurements of Charged Two-particle Exclusive States in Photon-photon Interactions
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A description is given of an experiment performed at the PEP electron-positron storage ring, using the DELCO detector, to measure the formation of charged particle pairs from interactions of pairs of virtual photons radiated from the colliding electron beams. The final states which are measured are electron-positron pairs, charged pion pairs, charged kaon pairs, and proton pairs. Electron-positron pairs are separated from other data by use of gas Cerenkov counters. The shapes of all kinematic distributions are found to agree with predictions of quantum electrodynamics. These data also are used as an accurate normalization for subtraction of the muon-pair background and for measurement of the cross sections of the three hadronic channels. Pion pairs are measured in the mass range from 0.6 to 2.0 GeV, where production of the f (1270) resonance is observed to interfere with significant continuum production. The continuum is well described by single-pion exchange, allowing a measurement of the f two-photon partial width of 3.47 +- 0.37 keV. No a priori assumption is made about the ratio of helicity amplitudes, and the phenomenological model used in fitting the data is constrained to satisfy elastic unitarity. If unitarity is not required, then the fitted partial width is a factor of 0.83 lower than the quoted value. The Q2 dependence of the cross section is found to be consistent with predictions of the Generalized Vector Dominance Model. Kaon pairs and proton pairs are identified by time-of-flight measurements. Kaon pairs are measured in the mass range from 1.3 to 2.0 GeV, where production of the f' (1520) resonance is observed. The ratio of the f and f' two-photon partial widths is found to be consistent with SU(3) quark model predictions with a mixing angle of 28 +- 4 degrees. Twenty-three proton pairs are observed.
Two Photon Production of Pion Pairs in E+e− Collisions at 29 GeV
Author: John Henry BoyerPhoton 2001
Author: Maria-Novella Kienzle-FocacciPublisher: World Scientific
ISBN: 9789812380531
Category : Science
Languages : en
Pages : 444
Book Description
This volume reports on all aspects of high energy photon interactions using both photon and proton targets. Significant new results from the LEP and HERA experiments as well as from CLEO II and BELLE are presented. These data are confronted with diverse theoretical models. In particular, predictions of QCD in both the perturbative and the non-perturbative sector are extensively discussed. The prospects for gamma-gamma physics at future high energy colliders are also reviewed. In total 72 papers are collected.The proceedings have been selected for coverage in: ? Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)
Hadron Physics
Author: Tullio BressaniPublisher: IOS Press
ISBN: 9781586035266
Category : Science
Languages : en
Pages : 728
Book Description
Valerio Filippini devoted his life to physics. His scientific contributions were provided in the OBELIX and FINUDA experiments. The FINUDA experiment collected physics data immediately after the roll-in, thanks to the reliability and simplicity of the on-line system designed and assembled by the physicist. This work is dedicated to him.
Author: I. Adachi
Author: Willem G. Langeveld
Author: Ian W. Walker