Formation of <i>delta</i>(980) and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>A</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>(1320) in photon-photon collisions

D. Antreasyan; D. Aschman; D. Besset; J. K. Bienlein; E. D. Bloom; I. Brock; R. Cabenda; A. Cartacci; M. Cavalli-Sforza; R. Clare; G. Conforto; S. Cooper; R. Cowan; D. Coyne; G. Drews; A. Engler; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Godfrey; F. H. Heimlich; R. Hofstadter; J. Irion; Z. Jakubowski; S. Keh; H. Kilian; I. Kirkbride; T. Kloiber; W. Koch; A. C. König; K. Königsmann; R. W. Kraemer; R. Lee; S. Leffler; R. Lekebusch; P. Lezoch; A. M. Litke; W. Lockman; S. Lowe; B. Lurz; D. Marlow; W. Maschmann; T. Matsui; P. McBride; F. Messing; W. J. Metzger; B. Monteleoni; R. Nernst; C. Newman-Holmes; B. Niczyporuk; G. Nowak; C. Peck; P. G. Pelfer; B. Pollock; F. C. Porter; D. Prindle; P. Ratoff; B. Renger; C. Rippich; M. Scheer; P. Schmitt; M. Schmitz; J. Schotanus; A. Schwarz; D. Sievers; T. Skwarnicki; K. Strauch; U. Strohbusch; J. Tompkins; H. -J. Trost; R. T. Van de Walle; H. Vogel; U. Volland; K. Wachs; K. Wacker; W. Walk; H. Wegener; D. Williams; P. Zschorsch

doi:10.1103/PhysRevD.33.1847

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Formation of delta(980) and $A_{2}$ (1320) in photon-photon collisions

D. Antreasyan, D. Aschman, D. Besset, J. K. Bienlein, E. D. Bloom, I. Brock, R. Cabenda, A. Cartacci, M. Cavalli-Sforza et al.

R. Clare, G. Conforto, S. Cooper, R. Cowan, D. Coyne, G. Drews, A. Engler, G. Folger, A. Fridman, J. Gaiser, D. Gelphman, G. Godfrey, F. H. Heimlich, R. Hofstadter, J. Irion, Z. Jakubowski, S. Keh, H. Kilian, I. Kirkbride, T. Kloiber, W. Koch, A. C. König, K. Königsmann, R. W. Kraemer, R. Lee, S. Leffler, R. Lekebusch, P. Lezoch, A. M. Litke, W. Lockman, S. Lowe, B. Lurz, D. Marlow, W. Maschmann, T. Matsui, P. McBride, F. Messing, W. J. Metzger, B. Monteleoni, R. Nernst, C. Newman-Holmes, B. Niczyporuk, G. Nowak, C. Peck, P. G. Pelfer, B. Pollock, F. C. Porter, D. Prindle, P. Ratoff, B. Renger, C. Rippich, M. Scheer, P. Schmitt, M. Schmitz, J. Schotanus, A. Schwarz, D. Sievers, T. Skwarnicki, K. Strauch, U. Strohbusch, J. Tompkins, H. -J. Trost, R. T. Van de Walle, H. Vogel, U. Volland, K. Wachs, K. Wacker, W. Walk, H. Wegener, D. Williams, and P. Zschorsch

California Institute of Technology, Pasadena, California 91125
University of Cape Town, Cape Town, South Africa
Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
Cracow Institute of Nuclear Physics, Cracow, Poland
Deutsches Elektronen Synchrotron DESY, Hamburg, Germany
Universitat Erlangen-Nürnberg, Erlangen, Germany
INFN and University of Firenze, Italy
Universitat Hamburg, I. Institut für Experimentalphysik, Hamburg, Germany
Harvard University, Cambridge, Massachusetts 02138
University of Nijmegen and NIKHEF-Nijmegen, The Netherlands
Princeton University, Princeton, New Jersey 08544
Department of Physics, HEPL, and Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305
Universitat Würzburg, Würzburg, Germany ?Crystal Ball Collaboration)

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Phys. Rev. D 33, 1847 – Published 1 April, 1986

DOI: https://doi.org/10.1103/PhysRevD.33.1847

Abstract

The reaction γγ→ $π^{0}$ η has been investigated with the Crystal Ball detector at the DESY storage ring DORIS II. Formation of δ(980) and $A_{2}$ (1320) has been observed with γγ partial widths $Γ_{γ γ}$ ( $A_{2}$ )=1.14±0.20±0.2 6 keV and $Γ_{γ γ}$ (δ)B(δ→πη)=0.19±0.07 ${}_{- 0.07}^{+ 0.10}$ keV.

References (19)

Crystal Ball Collaboration, C. Edwards et al., Phys. Lett. 110 B, 82 (1982).
Crystal Ball Collaboration, M. Oreglia et al., Phys. Rev. D 25, 2259 (1982); M. Oreglia, Ph.D. thesis, Stanford University, Report No. SLAC-236, 1980; J. Gaiser, Ph.D. thesis, Stanford University, Report No. SLAC-255, 1982.
Particle Data Group, Rev. Mod. Phys. 56, S1 (1984).
G. Bonneau, M. Gourdin and F. Martin, Nucl. Phys. B 54, 573 (1973).
R. Ford and W. Nelson, SLAC Report No. 210, 1978 (unpublished).
σ ${}_{γ γ - > R - > π η}$ (W)=8 π (2L+1) Γ ${}_{γ γ}$ (R)B(R -> π η ) $Γ_{R}$ / [( $m_{R}$ ${}^{2}$ - $W^{2}$ $)^{2}$ + $m_{R}$ ${}^{2}Γ_{R}$ ${}^{2}$ ] with R= delta or $A_{2}$ and L=0 or 2, respectively. We have used the following energy-dependent total width: $Γ_{R}$ (W)= $Γ_{R}$ ( $m_{R}$ ) (q/ $q_{0}$ ) ${}^{2 L + 1}$ $D_{L}$ ( $q_{0}$ r)/ $D_{L}$ (qr), where q is the pi momentum in the π eta rest frame and $q_{0}$ is the same calculated for W= $m_{R}$ . $D_{L}$ is the Blatt-Weisskopf-barrier-penetration function. The interaction length r is set to 1 fm (Ref. 10).
The large error is caused by our mass resolution being comparable to the natural linewidth.
The sum of fractions was constrained to be equal to 1 in the fit, thus the errors are strongly correlated.
J. Babcock and J. L. Rosner, Phys. Rev. D 14, 1286 (1976).
PLUTO Collaboration, Ch. Berger et al., Phys. Lett. 149 B, 427 (1984).
J. E. Olsson (JADE Collaboration), in Photon Photon Collisions, proceedings of the Fifth International Workshop on Photon Photon Collisions, Aachen, 1983, edited by C. Berger (Lecture Notes in Physics, Vol. 191) (Springer, Berlin, 1983), p. 45.
S. M. Flatté, Phys. Lett. 63 B, 224 (1976); N. N. Achasov, S. A. Devyanin and G. N. Shestakov, Usp. Fiz. Nauk 142, 361 (1984) [Sov. Phys. Usp. 27, 161 (1984)].
A. Bramón and M. Greco, Lett. Nuovo Cimento 2, 522 (1971).
S. B. Berger and B. T. Feld, Phys. Rev. D 8, 3875 (1973).
G. K. Greenhut and G. W. Intemann, Phys. Rev. D 18, 231 (1978).
V. M. Budnev and A. E. Kaloshin, Phys. Lett. 86 B, 351 (1979).
N. N. Achasov, S. A. Devyanin and G. N. Shestakov, Z. Phys. C 16, 55 (1982).
CELLO Collaboration, H. J. Behrend et al., Phys. Lett. 114 B, 378 (1982); , ibid. 125 B, 518(E) (1983).
Γ ${}_{γ γ}$ ( $A_{2}$ )/ $m_{A_{2}}$ ${}^{3}$ : Γ ${}_{γ γ}$ (f) / $m_{f}^{3}$ : Γ ${}_{γ γ}$ (f prime )/ $m_{f prime}$ ${}^{3}$ =3: (sintheta + sqrt 8 cos θ $)^{2}$ : ( sqrt 8 sin θ - cos θ $)^{2}$ , where theta is the singlet-octet mixing angle (Ref. 10).

[c1] Crystal Ball Collaboration, C. Edwards et al., Phys. Lett. 110 B, 82 (1982).

[c2] Crystal Ball Collaboration, M. Oreglia et al., Phys. Rev. D 25, 2259 (1982); M. Oreglia, Ph.D. thesis, Stanford University, Report No. SLAC-236, 1980; J. Gaiser, Ph.D. thesis, Stanford University, Report No. SLAC-255, 1982.

[c3] Particle Data Group, Rev. Mod. Phys. 56, S1 (1984).

[c4] G. Bonneau, M. Gourdin and F. Martin, Nucl. Phys. B 54, 573 (1973).

[c5] R. Ford and W. Nelson, SLAC Report No. 210, 1978 (unpublished).

[c6] σ ${}_{γ γ - > R - > π η}$ (W)=8 π (2L+1) Γ ${}_{γ γ}$ (R)B(R -> π η ) $Γ_{R}$ / [( $m_{R}$ ${}^{2}$ - $W^{2}$ $)^{2}$ + $m_{R}$ ${}^{2}Γ_{R}$ ${}^{2}$ ] with R= delta or $A_{2}$ and L=0 or 2, respectively. We have used the following energy-dependent total width: $Γ_{R}$ (W)= $Γ_{R}$ ( $m_{R}$ ) (q/ $q_{0}$ ) ${}^{2 L + 1}$ $D_{L}$ ( $q_{0}$ r)/ $D_{L}$ (qr), where q is the pi momentum in the π eta rest frame and $q_{0}$ is the same calculated for W= $m_{R}$ . $D_{L}$ is the Blatt-Weisskopf-barrier-penetration function. The interaction length r is set to 1 fm (Ref. 10).

[c7] The large error is caused by our mass resolution being comparable to the natural linewidth.

[c8] The sum of fractions was constrained to be equal to 1 in the fit, thus the errors are strongly correlated.

[c9] J. Babcock and J. L. Rosner, Phys. Rev. D 14, 1286 (1976).

[c10] PLUTO Collaboration, Ch. Berger et al., Phys. Lett. 149 B, 427 (1984).

[c11] J. E. Olsson (JADE Collaboration), in Photon Photon Collisions, proceedings of the Fifth International Workshop on Photon Photon Collisions, Aachen, 1983, edited by C. Berger (Lecture Notes in Physics, Vol. 191) (Springer, Berlin, 1983), p. 45.

[c12] S. M. Flatté, Phys. Lett. 63 B, 224 (1976); N. N. Achasov, S. A. Devyanin and G. N. Shestakov, Usp. Fiz. Nauk 142, 361 (1984) [Sov. Phys. Usp. 27, 161 (1984)].

[c13] A. Bramón and M. Greco, Lett. Nuovo Cimento 2, 522 (1971).

[c14] S. B. Berger and B. T. Feld, Phys. Rev. D 8, 3875 (1973).

[c15] G. K. Greenhut and G. W. Intemann, Phys. Rev. D 18, 231 (1978).

[c16] V. M. Budnev and A. E. Kaloshin, Phys. Lett. 86 B, 351 (1979).

[c17] N. N. Achasov, S. A. Devyanin and G. N. Shestakov, Z. Phys. C 16, 55 (1982).

[c18] CELLO Collaboration, H. J. Behrend et al., Phys. Lett. 114 B, 378 (1982); , ibid. 125 B, 518(E) (1983).

[c19] Γ ${}_{γ γ}$ ( $A_{2}$ )/ $m_{A_{2}}$ ${}^{3}$ : Γ ${}_{γ γ}$ (f) / $m_{f}^{3}$ : Γ ${}_{γ γ}$ (f prime )/ $m_{f prime}$ ${}^{3}$ =3: (sintheta + sqrt 8 cos θ $)^{2}$ : ( sqrt 8 sin θ - cos θ $)^{2}$ , where theta is the singlet-octet mixing angle (Ref. 10).

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Formation of delta(980) and A2(1320) in photon-photon collisions

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Formation of delta(980) and $A_{2}$ (1320) in photon-photon collisions