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Duncan, F.; Hahn, H.; Aclander, C.; Ashery, D.; Auld, E.G.; Gill, D. R.; Hutcheon, D. A.; Jones, G.; Korkmaz, E.; MayTal‐Beck, S.; Moinester, M. A.; Niskanen, J.A.; Ottewell, D.; Rahav, A.; Ram, Shai; Sevior, M. E.; Walden, P.; Weiss, R.

doi:10.1103/physrevlett.80.4390

Cited by 34 publications

(33 citation statements)

References 21 publications

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“…We therefore present in Fig. 7a only an arbitrarily scaled cross section obtained from the cell data to facilitate a comparison of its shape with the published results from ANKE [26] and TRIUMF [28]. There is reasonable consistency between the two ANKE experiments, in particular in the forward pion angle region where the TRIUMF data begin to deviate.…”

Section: A Reanalysis Of the Proton Beam Datamentioning

confidence: 88%

“…Since no absolute normalization was here achieved, these values were scaled by an arbitrary overall factor. The TRIUMF data [28] are shown by the blue triangles. b) The proton analyzing power A It is much harder to evaluate a precise value for the absolute normalization for data taken with a long cell target than it is for a point-like vertex experiment.…”

Section: A Reanalysis Of the Proton Beam Datamentioning

confidence: 99%

“…The approach to pion production described here was first initiated at TRIUMF through pioneering measurements of the pn → {pp} s π − differential cross section [27] and the proton analyzing power in the pn → {pp} s π − reaction [28] at 353 MeV and it was the existence of these data that influenced our choice of beam energy. These results were complemented by TRIUMF data on the quasi-free absorption of a π − on the diproton pair in the 3 He nucleus [29].…”

Section: Introductionmentioning

confidence: 99%

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Measurement of spin observables in the quasifreenp→{pp}sπ−reaction at 353 MeV

Dymov¹,

Shmakova²,

Azaryan³

et al. 2013

Phys. Rev. C

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The transverse spin correlations Ax,x and Ay,y have been measured in the d p → pspec{pp}sπ − reaction at COSY-ANKE at 353 MeV per nucleon. Here {pp}s denotes a proton-proton pair with low excitation energy, which is dominantly in the 1 S0 state. By measuring three protons in the final state it was possible to extract events where there was a spectator proton pspec so that the reaction could be interpreted in terms of quasi-free n p → {pp}sπ − . The proton analyzing power in this reaction was also deduced from this data set by averaging over the polarization of the deuteron beam. The values of A p y were shown to be consistent with a refined analysis of our earlier results obtained with a polarized proton incident on a deuterium target. Taking these data in combination with our previous measurements of the differential cross sections and analyzing powers in the pp → {pp}s π 0 reaction, a more robust partial wave decomposition was achieved. Three different acceptable solutions were found and the only way of resolving this ambiguity without further theoretical input would be through a measurement of the mixed spin-correlation parameter Ax,z.

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Section: A Reanalysis Of the Proton Beam Datamentioning

confidence: 88%

Section: A Reanalysis Of the Proton Beam Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of spin observables in the quasifreenp→{pp}sπ−reaction at 353 MeV

Dymov¹,

Shmakova²,

Azaryan³

et al. 2013

Phys. Rev. C

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“…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: 99%

“…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%

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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