A PARTIAL-WAVE ANALYSIS OF THE REACTION GAMMA-GAMMA-]PI(-)PI(0)()PI()

Authors
ALBRECHT H HAMACHER T HOFMANN RP KIRCHHOFF T MANKEL R NAU A NOWAK S RESSING D SCHRODER H SCHULZ HD WALTER M WURTH R HAST C KAPITZA H KOLANOSKI H KOSCHE A LANGE A LINDNER A SCHIEBER M SIEGMUND T THURN H TOPFER D WEGENER D FRANKL C GRAF J SCHMIDTLER M SCHRAMM M SCHUBERT KR SCHWIERZ R SPAAN B WALDI R REIM K WEGENER H ECKMANN R KUIPERS H MAI O MUNDT R OEST T REINER R SCHMIDTPARZEFALL W STIEWE J WERNER S EHRET K HOFMANN W HUPPER A KNOPFLE KT SPENGLER J KRIEGER P MACFARLANE DB PRENTICE JD SAULL PRB TZAMARIUDAKI K VANDEWATER RG YOON TS SCHNEIDER M WESELER S BRACKO M KERNEL G KRIZAN P KRIZNIC E MEDIN G PODOBNIK T ZIVKO T BALAGURA V BARSUK S BELYAEV I CHISTOV R DANILOV M EIGES V GERSHTEIN L GERSHTEIN Y GOLUTVIN A IGONKINA O KOROLKO I KOSTINA G LITVINTSEV D PAKHLOV P SEMENOV S SNIZHKO A TICHOMIROV I ZAITSEV Y
Citation
H. Albrecht et al., A PARTIAL-WAVE ANALYSIS OF THE REACTION GAMMA-GAMMA-]PI(-)PI(0)()PI(), Zeitschrift fur Physik. C, Particles and fields, 74(3), 1997, pp. 469-477
Citations number
21
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
74
Issue
3
Year of publication
1997
Pages
469 - 477
Database
ISI
SICI code
0170-9739(1997)74:3<469:APAOTR>2.0.ZU;2-G
Abstract
The two-photon reaction gamma gamma --> pi(+)pi(-)pi(0) was investigat ed by the ARGUS collaboration. The reaction is dominated by the format ion of the a(2)(1320) meson. A value of Gamma(gamma gamma) = (0.96 +/- 0.03 +/- 0.13) keV was obtained for its radiative width, in good agre ement with the world average. The fraction of gamma gamma-helicity 0 i n the a(2) two-photon width was found to be equal to (6.7 +/- 2.2)%. I t allows a discrimination among models that describe the dynamics in t he two-photon production of tensor mesons. An upper limit of Gamma(gam ma gamma).Br(rho(+/-)pi-/+) < 0.54 keV (90% c.l.) was obtained for the resonance pi(1300). The partial wave analysis revealed almost a compl ete absence of the wave with spin and parity J(P) = 2(-). We also obse rve no significant enhancement in the pi(+)pi(-)pi(0) invariant mass s pectrum that could be attributed to the two-photon production of the p i(2)(1670). The obtained upper limit Gamma(gamma gamma)(pi(2)(1670)) < 0.19 keV at the 90% confidence level is in contradiction with two pre vious observations.