<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi></mml:mrow></mml:math>-wave pion production from nucleon-nucleon collisions

Baru, V.; Epelbaum, E.; Haidenbauer, J.; Hanhart, C.; Kudryavtsev, A. E.; Lensky, Vadim; Meißner, Ulf‐G.

doi:10.1103/physrevc.80.044003

Cited by 40 publications

(58 citation statements)

References 73 publications

(128 reference statements)

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“…[20,26] showed a satisfactory agreement with the data. Meanwhile, for pion s-waves loop diagrams start to contribute individually already at NLO.…”

supporting

confidence: 76%

“…The results of Refs. [26,27] provide strong indications for a good convergence of the s-and pwave pion production operators in the charged channels where the operators are natural and no suppression at LO takes place. On the other hand, s-wave pion production in pp → ppπ 0 looks exceptional since the experimental cross section in this channel is suppressed by more than an order of magnitude as compared to the charged channels near threshold.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…This general argument was confirmed numerically in phenomenological calculations [22][23][24], see also Refs. [14,17,21,25] where the effect of the ∆ in NN → NNπ was studied within chiral EFT. However, in this paper we focus on contributions from nucleons and pions only.…”

mentioning

confidence: 99%

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Pion production in nucleon-nucleon collisions in chiral effective field theory: Next-to-next-to-leading order contributions

et al. 2012

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A complete calculation of the pion-nucleon loops that contribute to the transition operator for N N → N N π up-to-and-including next-to-next-to-leading order (N 2 LO) in chiral effective field theory near threshold is presented. The evaluation is based on the so-called momentum counting scheme, which takes into account the relatively large momentum of the initial nucleons inherent in pion-production reactions. We show that the significant cancellations between the loops found at next-to-leading order (NLO) in the earlier studies are also operative at N 2 LO. In particular, the 1/m N corrections (with m N being the nucleon mass) to loop diagrams cancel at N 2 LO, as do the contributions of the pion loops involving the low-energy constants c i , i = 1 . . . 4. In contrast to the NLO calculation however, the cancellation of loops at N 2 LO is incomplete, yielding a non-vanishing contribution to the transition amplitude. Together with the one-pion exchange tree-level operators, the loop contributions provide the long-range part of the production operator. Finally, we discuss the phenomenological implications of these findings. In particular, we find that the amplitudes generated by the N 2 LO pion loops yield contributions comparable in size with the most important phenomenological heavy-meson exchange amplitudes.2

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“…[20,26] showed a satisfactory agreement with the data. Meanwhile, for pion s-waves loop diagrams start to contribute individually already at NLO.…”

supporting

confidence: 76%

Section: Summary and Discussionmentioning

confidence: 99%

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Pion production in nucleon-nucleon collisions in chiral effective field theory: Next-to-next-to-leading order contributions

et al. 2012

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“…This calculation is a particular beautiful example how very different quantities and processes are related through the same LECs -here the dimension two LEC c 5 that drives the strong IV in the nucleon sector [15]. It also shows that a refined NLO calculation of A fb will offer a viable alternative to extract this fundamental quantity (the corresponding isospin-symmetric calculations of pion production where recently performed [16]). …”

Section: Isospin-breaking In the Pionnucleon Scattering Lengthsmentioning

confidence: 99%

Isospin violation, light quark masses, and all that

Meißner

2010

Chinese Phys. C

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“…The quality of this approximation was also checked by explicit calculations of the d-wave production amplitudes within chiral effective field theory up to order m π /m N (NNLO) [36]. These show that the phase assumptions made here should be valid to within ±2…”

Section: Partial Wave Decompositionmentioning

confidence: 99%

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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p-wave pion production from nucleon-nucleon collisions

Cited by 40 publications

References 73 publications

Pion production in nucleon-nucleon collisions in chiral effective field theory: Next-to-next-to-leading order contributions

Pion production in nucleon-nucleon collisions in chiral effective field theory: Next-to-next-to-leading order contributions

Isospin violation, light quark masses, and all that

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

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