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Physical Review Letters
Volumn 64, Issue 2, 1990, Pages 172-175
Investigation of the electromagnetic structure of and emesons by two-photon interactions

(81)  Aihara, H a,b,c,d,e,f,g,h,i,j,k,l   Alston Garnjost, M a,b,c,d,e,f,g,h,i,j,k,l   Avery, R E a,b,c,d,e,f,g,h,i,j,k,l   Barbaro Galtieri, A a,b,c,d,e,f,g,h,i,j,k,l   Barker, A R a,b,c,d,e,f,g,h,i,j,k,l   Barnett, B A a,b,c,d,e,f,g,h,i,j,k,l   Bauer, D A a,b,c,d,e,f,g,h,i,j,k,l   Bay, A a,b,c,d,e,f,g,h,i,j,k,l   Bobbink, G J a,b,c,d,e,f,g,h,i,j,k,l   Buchanan, C D a,b,c,d,e,f,g,h,i,j,k,l   Buijs, A a,b,c,d,e,f,g,h,i,j,k,l   Caldwell, D O a,b,c,d,e,f,g,h,i,j,k,l   Chao, H Y a,b,c,d,e,f,g,h,i,j,k,l   Chun, S B a,b,c,d,e,f,g,h,i,j,k,l   Clark, A R a,b,c,d,e,f,g,h,i,j,k,l   Cowan, G D a,b,c,d,e,f,g,h,i,j,k,l   Crane, D A a,b,c,d,e,f,g,h,i,j,k,l   Dahl, O I a,b,c,d,e,f,g,h,i,j,k,l   Daoudi, M a,b,c,d,e,f,g,h,i,j,k,l   Derby, K A a,b,c,d,e,f,g,h,i,j,k,l   more..

Author keywords

[No Author keywords available]
Indexed keywords

EID: 4243930200     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.64.172     Document Type: Article
Times cited : (98)
References (30)
  • 3
    • 85067325793 scopus 로고    scopus 로고
    • J. F. Donoghue and D. Wyler, University of Massachusetts Report No. UMHEP-312, 1988 (to be published); Nucl. Phys. B (to be published).
  • 6
    • 85067324861 scopus 로고    scopus 로고
    • note that there is a factor of 4 π alpha difference in convention for the definition of form factors between this reference and our analysis.
  • 8
    • 85067324731 scopus 로고    scopus 로고
    • this previous measurement of the η prime γstargamma form factor used only a 50-pb-1 subset of the present sample.
  • 13
    • 85067328126 scopus 로고    scopus 로고
    • These cuts are a compromise between rejecting undesired and nonexclusive background and keeping the events from decay chains where one of the final-state photons is undetected. We rely on Monte Carlo calculations to simulate the effect of the cuts on these latter reactions.
  • 14
    • 85067328934 scopus 로고    scopus 로고
    • The untagged e+ or e- is constrained in the fit to lie within 3.4 mrad of the beam axis, a region where the fitting efficiency is large and well understood. We have corrected for the small ( < 10 %) number of tagged eta and η prime events which the Monte Carlo simulation predicts will fail to fit due to this requirement.
  • 15
    • 85067323622 scopus 로고    scopus 로고
    • Monte Carlo simulations predict that 23% of our eta mesons come from the direct decay η -> π+π-gamma.
  • 16
    • 85067324473 scopus 로고    scopus 로고
    • Monte Carlo simulations predict that 7% of our η prime mesons come from the decay into π+π-eta.
  • 22
    • 85067323568 scopus 로고    scopus 로고
    • Kent Schwitkis, Ph.D. thesis, University of California, Santa Barbara, 1987 (unpublished).
  • 23
    • 85067325466 scopus 로고    scopus 로고
    • A Rittenberg, Ph.D. thesis, University of California, Berkeley, University of California Report No. UCRL-18863, 1969 (unpublished);
  • 25
    • 85067326253 scopus 로고    scopus 로고
    • The Gaussian shape gives a slightly better fit for the η prime than does the Monte Carlo distribution, presumably due to difficulties in simulating the decay via the very broad ρ0. The difference in estimated numbers of events between the two methods has been included in the systematic error estimates for our results.
  • 26
    • 85067324228 scopus 로고    scopus 로고
    • We have calculated these world averages ( Γ η->γγ = 0.54 +- 0.05 keV and Γ ηprime->γγ = 4.13 +- 0.31 keV) using only recent, published, two-photon experimental results.
  • 28
    • 85067326191 scopus 로고    scopus 로고
    • This reference gives the results of earlier experiments using the decay η -> e+e-gamma, which have large errors and require large radiative corrections.

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.