Production and decay properties of the ω<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>state at 1250 MeV/<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>produced by 20-GeV polarized photons on hyd

Brau, J. E.; Wester, W. C.; Abe, Kenji; Bacon, T. C.; Ballam, J.; Bingham, H. H.; Braune, K.; Brick, D.; Bugg, W.; Butler, J. M.; Cameron, W.; Carroll, J. T.; Cautis, C. V.; Cohn, H. O.; Colley, D.C.; Condo, G.T.; Dado, S.; Diamond, R. N.; Dingus, P.; Erickson, R.; Fieguth, T.; Fortney, L.; Franek, B.; Fujiwara, N.; Gearhart, R.; Glanzman, T.; Godfrey, Ian; Goldberg, J.; Goshaw, A. T.; Hall, G.; Hancock, Edwin R.; Handler, T.; Hargis, H. J.; Hart, E. L.; Harwin, M. J.; Hasegawa, K.; Hulsizer, R. I.; Jobes, M.; Kafka, T.; Kalmus, G.; Kelsey, D. P.; Kent, J.; Kitagaki, T.; Levy, A.; Mann, W. A.; Merenyi, R.; Milburn, R. H.; Milstène, C.; McCrory, E.; Moffeit, K. C.; Napier, A.; Noguchi, S.; Ochiai, F.; O’Dell, V.; O’Neale, S. W.; Palounek, A. P.T.; Pless, I. A.; Rankin, P.; Sagawa, H.; Sato, Takahiro; Schneps, J.; Shank, J. T.; Shapiro, A.; Shimony, J.; Sugahara, R.; Suzuki, A.; Takahashi, K.; Tamai, K.; Tanaka, S.; Tether, S.; Waide, D. A.; Walker, W. D.; Widgoff, M.; Wilkins, Christina; Woods, C. A.; Yamaguchi, A.; Yamamoto, R. K.; Yamashita, S.; Yoshimura, Y.; Yost, G.P.; Yuta, H.

doi:10.1103/physrevd.37.2379

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…They concluded that the enhancement is consistent with predominant b 1 (1235) production, with ∼ 20% J P = 1 − background. This conclusion was confirmed by a SLAC experiment [6] at an energy of 20 GeV, W = 6.2 GeV, with a polarised beam. It should be noted that a spin-parity analysis of the H1 data cannot be performed because of limited acceptance.…”

supporting

confidence: 57%

Evidence for quark spin-flip in pomeron exchange

Donnachie

2005

Physics Letters B

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Spin-parity analyses of the ωπ system in the reaction γp → (ωπ)p for photon laboratory energies from 20 to 70 GeV have shown that production of the J P = 1 + b1(1235) meson dominates, with a J P = 1 − background at the level of 20%. Using vector-meson dominance arguments, this background is shown to be consistent with the data on e + e − → ωπ. The energy dependence of the data imply that the mechanism is a combination of Reggeon and Pomeron exchange. Assuming that the latter is relevant only for the J P = 1 − component and extrapolating to W = 200 GeV, it is argued that this accounts for most of the preliminary ωπ signal observed by the H1 Collaboration in the same reaction. A residual peak can be ascribed to the b1(1235), which requires a quark spin-flip from Pomeron exchange. Precisely the same mechanism occurs in the reaction πp → a1(1260)p.

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supporting

confidence: 57%

Evidence for quark spin-flip in pomeron exchange

Donnachie

2005

Physics Letters B

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“…Additionally the production mechanism does not appear to conserve s-channel helicity. This latter conclusion is confirmed in the experiment of [9] which had the benefit of a linearly-polarised beam. The angular distribution of the production plane relative to the photon polarisation vector has structure which is inconsistent with s-channel helicity conservation.…”

Section: Introductionmentioning

confidence: 53%

“…The angular distribution of the production plane relative to the photon polarisation vector has structure which is inconsistent with s-channel helicity conservation. The decay angular distributions of the two experiments agree and it was also concluded by [9] that the data favour a b 1 (1235) interpretation over a vector-meson interpretation. Preliminary data [10] on ωπ photoproduction at high energy indicate a cross section for the 1250 MeV enhancement which is comparable to or larger than the cross section at much lower energy [8,9], with the natural inference that it is being produced diffractively.…”

Section: Introductionmentioning

confidence: 58%

“…Many years ago evidence was presented [6] for two vector states with masses 1097 ± 19 MeV and 1266 ± 35 MeV in the reaction γp → e + e − p. The evidence for these two states was obtained from the interference between the Bethe-Heitler amplitude and the real part of the hadronic photoproduction amplitude. Additionally in ωπ photoproduction [7,8,9], γp → (ωπ)p, the ωπ system is dominated by a low-mass enhancement with a peak at about 1250 MeV and it seemed natural to associate this with a vector state. However it appears that this enhancement is dominated by the J P = 1 + b 1 (1235) meson.…”

Section: Introductionmentioning

confidence: 99%

“…However it appears that this enhancement is dominated by the J P = 1 + b 1 (1235) meson. The evidence for this comes from the analysis [8,9] of the decay angular distributions of the ωπ system. The conclusion of [8] is that the data are best described by production of the b 1 (1235) together with a small J P = 1 − contribution.…”

Section: Introductionmentioning

confidence: 99%

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