Observation of radiative annihilation into a Φ meson

Amsler, C.; Armstrong, D. S.; Augustin, I.; Baker, C.A.; Barnett, B. M.; Batty, C.J.; Beuchert, K.; Birien, P.; Blüm, P.; Bossingham, R.; Braune, K.; Brose, J.; Bugg, D. V.; Burchell, M. J.; Case, T.; Cooper, Anthony R.; Cramer, O.; Crowe, K. M.; Degener, T.; Dietz, H. P.; Dombrowski, S. von; Doser, M.; Dünnweber, W.; Engelhardt, D.; Englert, M.; Faessler, M.; Felix, Corinne; Hackmann, R.; Haddock, R. P.; Heinsius, F. H.; Herz, M.; Hessey, N. P.; Hidas, P.; Illinger, P.; Jamnik, D.; Kalinowsky, H.; Kämmle, B.; Kiel, T.; Kisiel, J.; Klempt, E.; Kobel, M.; Koch, H.; Kolo, Castulus; Königsmann, K.; Kunze, M.; Lakata, M.; Landua, R.; Lüdemann, J.; Matthäy, H.; McCrady, R.; Merkel, M.; Merlo, J.-P.; Meyer, C. A.; Montanet, L.; Noble, A. J.; Ould-Saada, F.; Peters, K.; Pinder, C. N.; Pintér, G.; Ravndal, S.; Regenfus, C.; Schäfer, Erich; Schmidt, P.; Seibert, R.; Spanier, S.; Stöck, H.; Straßburger, C.; Strohbusch, U.; Suffert, M.; Thoma, U.; Tischhäuser, M.; Urner, D.; Völcker, C.; Frank, Werner; Walther, Dirk; Wiedner, U.; Winter, N.; Zoll, J.; Zou, B. S.; Zupančič, Č.

doi:10.1016/0370-2693(95)00141-7

Cited by 58 publications

(28 citation statements)

References 16 publications

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“…The absolute value for the annihilation frequency was not determined but the ratio to thepp → φπ 0 frequency was given. The value in Table 5 was deduced from this ratio and from the annihilation frequency of thē pp → φπ 0 channel measured by the same collaboration [3]. It is in good agreement with our result for annihilation in liquid shown in Table 2 and Table 4.…”

supporting

confidence: 89%

“…Recently large OZI rule violation has been found in somepp annihilation channels in the experiments with stopped antiprotons at LEAR (CERN). Measurements of the Crystal Barrel collaboration show that the ratio of yields for the reactionsp + p → φ(ω) + γ is R(φγ/ωγ) = (250 ± 89) · 10 −3 [3]. Large apparent violation of the OZI rule was also found for thep + p → φ(ω) + π 0 channel, where R(φπ 0 /ωπ 0 ) = (96 ± 15) · 10 −3 for annihilation in the liquid hydrogen target [3] and R(φπ 0 /ωπ 0 ) = (114 ± 24) · 10 −3 for annihilation in the gas hydrogen target [4].…”

mentioning

confidence: 99%

“…where the Crystal Barrel collaboration found [6], [3] that the ratio R for annihilation in liquid R(φη/ωη) = (6.0 ± 2.0) · 10 −3 is in agreement with the OZI rule prediction [1]. Since reaction (2) proceeds from the same protonium levels as thepp → φπ 0 reaction, but from isospin I=0, one may expect that the φη final state will also be suppressed for annihilation from the 1 P 1 state.…”

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confidence: 99%

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Measurements of the reaction p̄p→φη of antiproton annihilation at rest at three hydrogen target densities

et al. 1998

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Measurements of the reactionpp → φη of antiproton annihilation at rest at three hydrogen target densitiesThe OBELIX Collaboration. AbstractThepp annihilation at rest into the φη final state was measured for three different target densities: liquid hydrogen, gaseous hydrogen at NTP and at a low pressure of 5 mbar. The yield of this reaction in the liquid hydrogen target is smaller than in the low-pressure gas target. The branching ratios of the φη channel were calculated on the basis of simultaneous analysis of the three data samples. The branching ratio for annihilation into φη from the 3 S 1 protonium state turns out to be about ten times smaller as compared to the one from the 1 P 1 state.

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supporting

confidence: 89%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Measurements of the reaction p̄p→φη of antiproton annihilation at rest at three hydrogen target densities

et al. 1998

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“…Values larger than this could be signals for hidden strangeness in some of the incident particles or to intrinsic violations of the rule through second-order processes. The most striking enhancements have been seen in pp annihilation where, in certain channels, observed φ production rates [3] are up to two orders of magnitude higher than predicted by the rule.…”

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confidence: 91%

Near-Threshold Production ofωMesons in thepp→ppωReaction

et al. 1999

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The total cross section for ω production in the pp → ppω reaction has been measured at five c.m. excess energies from 3.8 to 30 MeV. The energy dependence is easily understood in terms of a strong protonproton final state interaction combined with a smearing over the width of the state. The ratio of near-threshold φ and ω production is consistent with the predictions of a one-pion-exchange model and the degree of violation of the OZI rule is similar to that found in the π − p → nω/φ reactions.

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“…One example is φ production in proton-anti-proton annihilation. Recent experiments on vector meson production through pp annihilation at rest [17][18][19] report a strong violation of the OZI rule. It can be accounted for by the presence of an intrinsic ss component in the nucleon wave function [8,20], which contributes to the process through the rearrangement and shake-out diagrams [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Photoproduction ofφmesons from the proton: Polarization observables and strangeness in the nucleon

Титов¹,

Yang

et al. 1998

Phys. Rev. C

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The polarization observables in φ meson photoproduction is studied to probe the strangeness content of the nucleon. In addition to the dominant diffractive production and the one-pion-exchange process, we take into account the direct knockout mechanism that arises from the possible hidden strangeness content of the nucleon. We find that some double polarization observables are very sensitive to the strangeness content of the proton because of the different spin structures of the amplitudes associated with different mechanisms. This suggests that such measurements could be very useful in probing the strangeness content in the proton. The orbitally excited quark-cluster configurations in the proton are included in the calculation and found to have little effect. PACS number(s): 13.88.+e, 24.70.+s, 25.20.Lj, 13.60.Le

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Observation of radiative annihilation into a Φ meson

Cited by 58 publications

References 16 publications

Measurements of the reaction p̄p→φη of antiproton annihilation at rest at three hydrogen target densities

Measurements of the reaction p̄p→φη of antiproton annihilation at rest at three hydrogen target densities

Near-Threshold Production ofωMesons in thepp→ppωReaction

Photoproduction ofφmesons from the proton: Polarization observables and strangeness in the nucleon

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