Analysing power Ay in the reaction p→p→ppη close to threshold

Winter, P.; Adam, H.-H.; Bauer, F.; Budzanowski, A.; Czyzykiewicz, R.; Götz, Thomas; Grzonka, D.; Jarczyk, L.; Khoukaz, A.; Kilian, K.; Kolf, C.; Kowina, P.; Lang, N.; Lister, Tim; Moskal, P.; Oelert, W.; Quentmeier, C.; Rożek, T.; Santo, R.; Schepers, G.; Sefzick, T.; Siemaszko, M.; Smyrski, J.; Steltenkamp, Siegfried; Strzalkowski, A.; Wolke, M.; Wüstner, P.; Zipper, W.

doi:10.1016/s0370-2693(02)02417-6

Cited by 28 publications

(32 citation statements)

References 35 publications

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“…So far such measurements were performed only for the π 0 meson production [15,16]. In case of the η mesons only beam analysing power A y for the pp → ppη reaction was studied with a poor precision [17][18][19][20] where the best result of A y determined for four angular bins with uncertainty of ±0.1 is based on about 2000 reconstructed events [17]. In the near future, the precision of the determination of angular dependence of the analysing power for the pp → ppη reaction will be improved up to ±0.01 based on a new high statistics data sample (about 10 6 reconstructed pp → ppη events) collected using the large acceptance and azimuthally symmetric WASA detector and a polarized proton beam of the Cooler Synchrotron COSY [21,22].…”

Section: Introductionmentioning

confidence: 99%

Few-Body Aspects of the Near Threshold Pseudoscalar Meson Production

Moskal

2014

Few-Body Syst

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During the last decade large samples of data have been collected on the production of the groundstate pseudoscalar mesons in collisions of proton or deuteron beam with hydrogen or deuterium target. These measurements have been performed in the vicinity of the kinematical threshold for meson production where only a few partial waves in both initial and final state are expected to contribute to the production process. This simplifies significantly the interpretation of the data, yet still appears to be challenging due to the three or four particle final state systems with a complex hadronic potential. We review experiments and phenomenology of the near threshold production of the ground-state mesons in the few-body final states as for example: nucleus-meson and nucleon-nucleon-meson, and report on the status of the search of the mesic-nuclei (a meson-nucleus bound states). Experimental advantages of measurements close to the kinematical threshold are discussed, and general features of the production mechanism of the η and η mesons in the nucleon-nucleon collisions are presented emphasising results of measurements of spin and isospin dependence of the production cross sections.

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Section: Introductionmentioning

confidence: 99%

Few-Body Aspects of the Near Threshold Pseudoscalar Meson Production

Moskal

2014

Few-Body Syst

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“…To further distinguish between the π and ρ meson exchange models, the determination of the analysing power in the polarization measurement was required. The first measurement by COSY-11 gave a indication in favour of the pseudoscalar exchange model, although due to the limited statistics the decisive conclusions could not be done [23][24][25]. The WASA-at-COSY performed a high-statistics measurement of the pp → ppη with the polarized beam.…”

Section: η Production Mechanism In the Interaction With Nucleonsmentioning

confidence: 99%

Production and interaction of theηmeson with nucleons and nuclei

Krzemień¹,

Khreptak²,

Moskal³

et al. 2016

EPJ Web Conf.

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Abstract. We report on the status of the search for η-mesic nuclei and the studies of the interaction of the η meson with nucleons. Recently we have completed the analysis of the new WASA-at-COSY data on the production of the η meson with polarized proton beam. New results on the analyzing power for the pp → ppη reaction with more than an order of magnitude improved precision shed a new light on the production mechanism of the η meson in nucleon-nucleon collisions. Also, the latest results of the search for η-mesic nuclei are discussed.

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“…So far the total and differential cross sections for the η meson production in nucleon-nucleon collisions [1] have been determined precisely [2][3][4][5][6][7][8][9][10][11][12][13][14]. However A y has been determined only by the DISTO [15] and COSY-11 [16][17][18] collaboration with large uncertainties. The presented experiment was conducted using the azimuthally symmetric WASA-at-COSY detector [19] and a polarized proton beam provided by COSY colliding with a proton target at two beam momenta: 2026 MeV/c and 2188 MeV/c corresponding to 15 MeV and 72 MeV excess energies, respectively.…”

Section: Introductionmentioning

confidence: 99%

Determination of the analysing power for the $\bar{p}p$ →ppηreaction using the WASA-at-COSY detector system

2016

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Abstract. High statistics measurements of the analyzing power for the pp → ppη reaction were performed with the WASA-at-COSY detector at the Cooler Synchrotron COSY. The η meson was produced at two excess energies: Q = 15 MeV and Q = 72 MeV, and it was registered using the missing and invariant mass techniques. The determined analyzing power is consistent with zero for Q = 15 MeV implying the dominance of s wave and an insignificant contribution of the S d partial wave. However, at Q = 72 MeV the angular distribution of the analyzing power reveals a strong interference of Ps and Pp partial waves. Moreover, the available theoretical predictions for the angular dependence of the analyzing power strongly deviate from our experimental results.

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Analysing power Ay in the reaction p→p→ppη close to threshold

Cited by 28 publications

References 35 publications

Few-Body Aspects of the Near Threshold Pseudoscalar Meson Production

Few-Body Aspects of the Near Threshold Pseudoscalar Meson Production

Production and interaction of theηmeson with nucleons and nuclei

Determination of the analysing power for the $\bar{p}p$ →ppηreaction using the WASA-at-COSY detector system

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