Study of the doubly radiative decay <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mfrac><mrow><mi>J</mi></mrow><mrow><mi>ψ</mi></mrow></mfrac><mo>→</mo><mi>γ</mi><mi>γ</mi><mrow><msup><mrow><mi>ρ</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math></span>

We present a study of the decay sequence $\frac{J}{ψ} \to γ X$ , $X \to γ ρ^{0}$ , $ρ^{0} \to π^{+} π^{-}$ , based on 5.8 × $10^{6}$ produced $\frac{J}{ψ}$ collected by the Mark III detector at the SLAC storage ring SPEAR. In the $γ ρ^{0}$ mass spectrum, we find two peaks with masses and widths consistent with the axial-vector mesons $f_{1} (1285)$ and $f_{1} (1420)$ that have recently been observed in two-photon collisions. Fits to the angular distributions confirm that the first peak is an axial-vector state, but are unable to distinguish between the $f_{1} (1420)$ or the pseudoscalar $η (1430)$ for the high-mass peak. Product branching fractions for both objects are presented.

References (13)

Particle Data Group, G. P. Yost et al., Phys. Lett. B 204, 1 (1988)
H. J. Lipkin, Phys. Lett. B 171, 298 (1986)
T. H. Burnett, in Glueballs, Hybrids and Exotic Hadrons, Upton, New York, 1988, edited by S-U. Chung (AIP Conf. Proc. No. 185) (AIP, New York, 1989)
J. Richman, in QCD and Beyond, proceedings of the XXth Rencontre de Moriond, Les Arcs, France, 1985, edited by J. Tran Thanh Van (Editions Frontieres, Gif-sur-Yvette, 1985) Ph.D. thesis, CALT-68-1231, 1985
C. Edwards, Ph.D. thesis, California Institute of Technology Report No. CALT-68-1165, 1985 J. E. Augustin et al., Orsay Report No. LAL/85-27, 1985 (unpublished)
A. Aihara et al., Phys. Rev. Lett. 57, 2500 (1986) G. Gidal et al., 59, 2012 (1987) ibid.59, 2016 (1987)
M. Chanowitz, Phys. Lett. 164B, 379 (1985) Milton Dean Slaughter and S. Oneda, Phys. Rev. Lett. 59, 1641 (1987)
D. Bernstein et al., Nucl. Instrum. Methods A226, 301 (1984)
R. Mir, in Proceedings of the VIIIth International Workshop on Photon-Photon Collisions, Shoresh, Israel, 1988, edited by U. Karshan (World Scientific, Singapore, 1988)
J. Babcock and J. L. Rosner, Phys. Rev. D 14, 1286 (1976) J. L. Rosner, ibid. 23, 1127 (1981)
R. N. Cahn, Phys. Rev. D 35, 3342 (1987) ibid.37, 833 (1988)
J. G. Körner, J. H. Kh¨n, M. Krammer, and H. Schneider, Nucl. Phys. B229, 115 (1983)

[c1] Particle Data Group, G. P. Yost et al., Phys. Lett. B 204, 1 (1988)

[c2] H. J. Lipkin, Phys. Lett. B 171, 298 (1986)

[c3] T. H. Burnett, in Glueballs, Hybrids and Exotic Hadrons, Upton, New York, 1988, edited by S-U. Chung (AIP Conf. Proc. No. 185) (AIP, New York, 1989)

[c4] J. Richman, in QCD and Beyond, proceedings of the XXth Rencontre de Moriond, Les Arcs, France, 1985, edited by J. Tran Thanh Van (Editions Frontieres, Gif-sur-Yvette, 1985) Ph.D. thesis, CALT-68-1231, 1985

[c5] C. Edwards, Ph.D. thesis, California Institute of Technology Report No. CALT-68-1165, 1985 J. E. Augustin et al., Orsay Report No. LAL/85-27, 1985 (unpublished)

[c6] A. Aihara et al., Phys. Rev. Lett. 57, 2500 (1986) G. Gidal et al., 59, 2012 (1987) ibid.59, 2016 (1987)

[c7] M. Chanowitz, Phys. Lett. 164B, 379 (1985) Milton Dean Slaughter and S. Oneda, Phys. Rev. Lett. 59, 1641 (1987)

[c8] D. Bernstein et al., Nucl. Instrum. Methods A226, 301 (1984)

[c10] R. Mir, in Proceedings of the VIIIth International Workshop on Photon-Photon Collisions, Shoresh, Israel, 1988, edited by U. Karshan (World Scientific, Singapore, 1988)

[c11] J. Babcock and J. L. Rosner, Phys. Rev. D 14, 1286 (1976) J. L. Rosner, ibid. 23, 1127 (1981)

[c12] R. N. Cahn, Phys. Rev. D 35, 3342 (1987) ibid.37, 833 (1988)

[c13] J. G. Körner, J. H. Kh¨n, M. Krammer, and H. Schneider, Nucl. Phys. B229, 115 (1983)

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Study of the doubly radiative decay $\frac{J}{ψ} \to γ γ ρ^{0}$

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Study of the doubly radiative decay Jψ→γγρ0

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Study of the doubly radiative decay $\frac{J}{ψ} \to γ γ ρ^{0}$