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Dymov, S.; Azaryan, T.; Barsov, S.; Baru, V.; Benati, P.; Bertelli, Susanna; Chiladze, D.; Dzyuba, A.; Gebel, R.; Goslawski, P.; Guidoboni, Greta; Hanhart, C.; Hartmann, Michael; Kacharava, A.; Khoukaz, A.; Komarov, V.I.; Kulessa, P.; Куликов, А. И.; Kurbatov, V.; Lenisa, P.; Lensky, Vadim; Lomidze, N.; Lorentz, B.; Macharashvili, G.; Mielke, M.; Mikirtytchiants, S.; Merzliakov, S.; Ohm, H.; Papenbrock, M.; Rathmann, F.; Serdyuk, V.; Shmakova, V.; Ströher, H.; Tabidze, M.; Tsirkov, D.; Trusov, S.; Uzikov, Yu. N.; Valdau, Yu.; Wilkin, C.

doi:10.1016/j.physletb.2012.05.002

Cited by 14 publications

(29 citation statements)

References 29 publications

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“…The differential cross 01020-p.5 section and the preliminary spin-correlation data give (1 − A x,x ) · dσ/dΩ(90 • ) = (77 ± 25) nb/sr. This is fully consistent with the results of the partial wave analysis [8], which predicts a value of 52 nb/sr.…”

Section: Partial Wave Analysissupporting

confidence: 91%

“…momentum, and k that of the produced pion. Whereas the TRIUMF results only cover the central region of pion angles [9], the ANKE data [8] in Fig. 3 extend over the whole angular domain.…”

Section: The Pn → { Pp} S π − Processmentioning

confidence: 94%

“…The forward/backward peaking is in complete contrast to the results found for π 0 production [7] and is an indication of the dominance of the I = 0 p-wave amplitudes in this reaction. [8] are shown by red circles and the TRIUMF results [9] by green triangles. The arbitrarily scaled TRIUMF cross sections extracted from π −3 He → pnp spec data [10] are also included (blue stars).…”

Section: The Pn → { Pp} S π − Processmentioning

confidence: 99%

“…[deg] The results for the analysing power of the pn → {pp} s π − reaction [8] are displayed in Fig. 4, with A y (dσ/dΩ) being shown in panel (a) and A y in panel (b).…”

Section: The Pn → { Pp} S π − Processmentioning

confidence: 99%

“…Although there is a significant overall relative uncertainty between the π − and π 0 production data, associated with luminosity and other systematic effects, the combined system is actually over determined [8].…”

Section: Partial Wave Analysismentioning

confidence: 99%

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Near-threshold pion production in diproton reactions with polarised beams and target at ANKE-COSY

Dymov

2012

EPJ Web of Conferences

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Abstract. An extensive experimental study of near-threshold pion production in diproton reactions is underway at the ANKE-COSY spectrometer (Jülich). The programme is aimed at isolating the four-nucleon-pion contact interaction term appearing in the χPT expansions of these processes. This will establish links between pion production and other low energy phenomena within the χPT approach. The first step in the programme was to measure the differential cross-section and the proton analysing power in the pp → {pp} s π 0 and pn → {pp} s π − reactions over the full angular range. Here {pp} s denotes a diproton, i.e.,a two-proton system in a 1 S 0 state. These data allow a partial wave analysis to be carried out provided that simplifying assumptions are made when applying the Watson theorem. To make the analysis more robust, and independent of the uncertainties in the relative normalization, the spin-correlation coefficients A x,x and A y,y in the n p → {pp} s π − reaction were measured in a follow-up experiment. The first results of the data analysis are presented and future developments of the programme are outlined. The physics case for near-threshold single pion productionThe ANKE [1] experimental programme on the near-threshold pion production aims to measure the cross sections and spin observables in the pp → {pp} s π 0 and np → {pp} s π − reactions [2,3]. The symbol {pp} s here denotes a diproton, that is, an unbound proton pair with a very low excitation energy, E pp < 3 MeV. The selection of a low excitation energy ensures the dominance of the 1 S 0 state of the diproton, which simplifies significantly the theoretical analysis. A full data set of all observables at low beam energies would allow us to determine the partial wave amplitudes which, in turn, would provide a non-trivial test of chiral perturbation theory [4] and also lead to the determination of the value of the parameter d, which represents the important contact term that affects the pion p-wave amplitudes.The short range physics in chiral effective field theories, which provide a model-independent understanding of Nature, is encoded in the so-called low energy constants (LEC). These LECs, once determined from one process, can be applied to predict many others. For example, the LECs c1-c4 extracted from πN analysis on the basis of chiral perturbation theory are now widely used to parameterise the short range physics in the NN-interaction, few-nucleon systems, single (and multi-) pion production in NN collisions etc. Analogously, by studying the p-wave pion production amplitudes we get access to the 4Nπ contact operator, the strength of which is controlled by the low energy constant d. This LEC enters also in electroweak processes, such as pp → de + ν and triton β decay, in few-body operators (e.g. in pd → pd), pion photoproduction γd → nnπ + and its inverse πd → γNN. It therefore plays a very important role in connecting different low-energy reactions.On the practical side, the pp → {pp} s π 0 and np → {pp} s π − reactions have the big advantage f...

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Section: Partial Wave Analysissupporting

confidence: 91%

“…momentum, and k that of the produced pion. Whereas the TRIUMF results only cover the central region of pion angles [9], the ANKE data [8] in Fig. 3 extend over the whole angular domain.…”

Section: The Pn → { Pp} S π − Processmentioning

confidence: 94%

Section: The Pn → { Pp} S π − Processmentioning

confidence: 99%

“…[deg] The results for the analysing power of the pn → {pp} s π − reaction [8] are displayed in Fig. 4, with A y (dσ/dΩ) being shown in panel (a) and A y in panel (b).…”

Section: The Pn → { Pp} S π − Processmentioning

confidence: 99%

Section: Partial Wave Analysismentioning

confidence: 99%

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Near-threshold pion production in diproton reactions with polarised beams and target at ANKE-COSY

Dymov

2012

EPJ Web of Conferences

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Differential cross section and analysing power of the pp→{pp}sπ0 reaction at 3

et al. 2012

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Coherent pion production in proton–deuteron collisions

et al. 2016

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Values of the proton analysing power in the pd → 3 He π 0 / 3 H π + reactions at 350-360 MeV per nucleon were obtained by using a polarised proton beam incident on a deuterium cluster-jet target and with a polarised deuteron beam incident on a target cell filled with polarised hydrogen. These results have a much larger angular coverage than existing data. First measurements are also presented of the deuteron vector analysing power and the deuteron-proton spin correlations. Data were also obtained on the deuteron-proton spin correlation and proton analysing power at small angles at 600 MeV per nucleon, though the angular coverage at this energy was much more restricted even when using a deuteron beam. By combining the extrapolated values of the spin correlations to the forward or backward directions with published measurements of the deuteron tensor analysing powers, the relative phases between the two non-vanishing amplitudes were evaluated.

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Differential cross section and analysing power of the quasi-free pn→{pp}sπ− re

Cited by 14 publications

References 29 publications

Near-threshold pion production in diproton reactions with polarised beams and target at ANKE-COSY

Near-threshold pion production in diproton reactions with polarised beams and target at ANKE-COSY

Differential cross section and analysing power of the pp→{pp}sπ0 reaction at 3

Coherent pion production in proton–deuteron collisions

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