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Physical Review D
Volumn 38, Issue 5, 1988, Pages 1365-1376
Formation of the pseudoscalars 0, and in the reaction

(92)  Williams, D A a,b,c,d,e,f,g,h,i,j,k,l,m   Antreasyan, D a,b,c,d,e,f,g,h,i,j,k,l,m   Bartels, H W a,b,c,d,e,f,g,h,i,j,k,l,m   Besset, D a,b,c,d,e,f,g,h,i,j,k,l,m   Bieler, Ch a,b,c,d,e,f,g,h,i,j,k,l,m   Bienlein, J K a,b,c,d,e,f,g,h,i,j,k,l,m   Bizzeti, A a,b,c,d,e,f,g,h,i,j,k,l,m   Bloom, E D a,b,c,d,e,f,g,h,i,j,k,l,m   Brock, I a,b,c,d,e,f,g,h,i,j,k,l,m   Brockmller K a,b,c,d,e,f,g,h,i,j,k,l,m   Cabenda, R a,b,c,d,e,f,g,h,i,j,k,l,m   Cartacci, A a,b,c,d,e,f,g,h,i,j,k,l,m   Cavalli Sforza, M a,b,c,d,e,f,g,h,i,j,k,l,m   Clare, R a,b,c,d,e,f,g,h,i,j,k,l,m   Compagnucci, A a,b,c,d,e,f,g,h,i,j,k,l,m   Conforto, G a,b,c,d,e,f,g,h,i,j,k,l,m   Cooper, S a,b,c,d,e,f,g,h,i,j,k,l,m   Cowan, R a,b,c,d,e,f,g,h,i,j,k,l,m   Coyne, D a,b,c,d,e,f,g,h,i,j,k,l,m   Drews, G a,b,c,d,e,f,g,h,i,j,k,l,m   more..

e DESY   (Germany)
Author keywords

[No Author keywords available]
Indexed keywords

EID: 0001377476     PISSN: 05562821     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevD.38.1365     Document Type: Article
Times cited : (57)
References (66)
  • 3
    • 84927434211 scopus 로고    scopus 로고
    • More information about this analysis can be found in D. Williams, Ph. D. thesis, Harvard University, 1987.
  • 7
    • 84927434210 scopus 로고    scopus 로고
    • The measured energy Emeas of each photon has been corrected using the formula Ecorr= Emeas/ [1+ 0.0137 ln ( Emeas/ Ebeam)]. The use of this formula correctly gives the π0 mass and the mass difference mϒ(2S) - mϒ(1S) in the reaction ϒ (2S) -> π0π0ϒ (1S), which were otherwise about 5% too low. The need for a correction stems from the extrapolation of the calibration energy (5 GeV from Bhabha events) down to the energy range 20–300 MeV. A discussion of this effect, and derivation of the form of the correction, can be found in D. Gelphman, Ph.D. thesis, Stanford University, 1985 (SLAC Report No. 286).
  • 8
    • 84927434209 scopus 로고    scopus 로고
    • For more detail about the roof counters, see D. Prindle, Ph.D. thesis, Carnegie-Mellon University, 1985.
  • 9
    • 84927434207 scopus 로고    scopus 로고
    • For this preliminary step, the transverse-momentum sum is calculated by assigning a momentum vector to each crystal with magnitude equal to the energy detected in that crystal. At all other stages of the analysis, transverse momentum is calculated from the reconstructed energies and direction of the showers.
  • 14
    • 84927434196 scopus 로고    scopus 로고
    • The average values of ( -q2) for accepted Monte Carlo events are 10 MeV2 for π0 events, 175 MeV2 for eta events, and 760 MeV2 for η prime events.
  • 24
    • 84927434195 scopus 로고    scopus 로고
    • J. Gaiser, Ph.D. thesis, Stanford University, 1983 (SLAC Report No. 255);
  • 25
    • 84927434194 scopus 로고    scopus 로고
    • R. Lee, Ph.D. thesis, Stanford University, 1985 (SLAC Report No. 282).
  • 26
    • 84927434193 scopus 로고    scopus 로고
    • For decays of slow particles, the opening angle is large and the mass resolution is dominated by the energy resolution. For typical π0 decays in multihadron events, the mass resolution is dominated by the resolution in the opening angle, and we observe an invariant-mass peak which is Gaussian.
  • 28
    • 84927434191 scopus 로고    scopus 로고
    • K. Wachs, Ph.D. thesis, Hamburg University, 1988 (DESY Report No. F31-88-01).
  • 30
    • 84927434190 scopus 로고    scopus 로고
    • Approximately 15% of the crystals were affected by this problem. The errors were restricted to true energies greater than 280 MeV in a single crystal, and for most of the affected crystals, a very limited energy range was recorded incorrectly. Since photons deposit roughly 70% of their energy in one crystal, this implies that photons with less than 400 MeV are rarely affected. The problem was in the read-out electronics and was subsequently studied with a pulse generator, so that its effect could be included in the Monte Carlo detector simulation. It is discussed in more detail in S. Lowe, Ph.D. thesis, Stanford University, 1986 (SLAC Report No. 307).
  • 34
    • 0000413224 scopus 로고
    • The result in this paper includes the data of, and Nucl. Phys. B152, 1 (1979).
    • (1979) Phys. Lett. , vol.83 B , pp. 131
    • Apel, W.1
  • 38
    • 84927434189 scopus 로고
    • Earlier editions [e.g., contain a note discussing the reason the result of Ref. 40 is not included in the average.
    • (1978) Phys. Lett. , vol.75 B , pp. 51
  • 52
    • 84927434187 scopus 로고    scopus 로고
    • We have corrected the value of Γ η->γγ to account for the most recent value of the η -> γ gamma branching ratio in Ref. 1.
  • 55
    • 84927434185 scopus 로고    scopus 로고
    • The value of Γ ηprime->γγ from this paper has been scaled to reflect the revised value of the branching ratio B {η prime -> γ γ}, discussed in Sec. V.
  • 58
    • 84927434176 scopus 로고    scopus 로고
    • The value of Γ ηprime->γγ from this paper has been scaled to reflect the revised value of the branching ratio Bηprime->γγ , discussed in Sec. V.

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.