Pionic deuterium

Strauch, Th.; Amaro, F. D.; Anagnostopoulos, D. F.; Bühler, P.; Covita, D. S.; Gorke, H.; Gotta, D.; Gruber, A.; Hirtl, A.; Indelicato, P.; Bigot, E.-O. Le; Nekipelov, M.; Santos, J. M. F. dos; Schmid, Philipp C.; Schlesser, S.; Simons, L. M.; Trassinelli, Martino; Veloso, J.F.C.A.; Zmeskal, J.

doi:10.1140/epja/i2011-11088-1

“…extracting σ πN from πN scattering, lies in controlling the required analytic continuation of the isoscalar πN amplitude into the unphysical region [86], which might even be sensitive to isospin-breaking corrections [87,88]. This analytic continuation can be stabilized with the help of the low-energy data that have become available in recent years thanks to accurate pionic-atom measurements [89,90], leading to a precise extraction of the πN scattering lengths [91,92]. A systematic analysis of πN scattering based on this input as well as constraints from unitarity, analyticity, and crossing symmetry along the lines…”

Section: Jhep07(2015)129mentioning

confidence: 99%

Light stops, blind spots, and isospin violation in the MSSM

Crivellin

¹

,

Hoferichter

²

,

Procura

³

et al. 2015

J. High Energ. Phys.

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In the framework of the MSSM, we examine several simplified models where only a few superpartners are light. This allows us to study WIMP-nucleus scattering in terms of a handful of MSSM parameters and thereby scrutinize their impact on dark matter direct-detection experiments. Focusing on spin-independent WIMP-nucleon scattering, we derive simplified, analytic expressions for the Wilson coefficients associated with Higgs and squark exchange. We utilize these results to study the complementarity of constraints due to direct-detection, flavor, and collider experiments. We also identify parameter configurations that produce (almost) vanishing cross sections. In the proximity of these so-called blind spots, we find that the amount of isospin violation may be much larger than typically expected in the MSSM. This feature is a generic property of parameter regions where cross sections are suppressed, and highlights the importance of a careful analysis of the nucleon matrix elements and the associated hadronic uncertainties. This becomes especially relevant once the increased sensitivity of future direct-detection experiments corners the MSSM into these regions of parameter space.

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“…[28] gives the value of theKd scattering length, obtained by the solution of the Faddeev equations with the one-channel energy-independent optical potential. The parameters of this potential were adjusted to reproduce the scattering lengths (22). The calculation, carried in Ref.…”

Section: The Role Of Recoil Effects For Kaonic Deuteriummentioning

confidence: 99%

“…What makes the experiments with kaonic deuterium extremely important is the fact that the S-waveKN scattering lengths are complex-valued, in difference, e.g., to the πN scattering lengths, which are real quantities. The πN scattering lengths can be, in principle, determined directly on the basis of π − H data alone [21] while the level shift of the pionic deuterium [22] is used as a complementary information to improve the accuracy in the extraction of the πN scattering lengths, see Ref. [23] for the results of the latest combined analysis of pionic atoms.…”

Section: Introductionmentioning

confidence: 99%

Recoil corrections in antikaon-deuteron scattering

Mai

¹

,

Baru

²

,

Epelbaum

³

et al. 2016

Proceedings of the 8th International Workshop on Chiral Dynamics — PoS(CD15)

0

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The recoil retardation effect in the K − d scattering length is studied. Using the non-relativistic effective field theory approach, it is demonstrated that a systematic perturbative expansion of the recoil corrections in the parameter ξ = M K /m N is possible in spite of the fact that K − d scattering at low energies is inherently non-perturbative due to the large values of theKN scattering lengths. The first order correction to the K − d scattering length due to single insertion of the retardation term in the multiple-scattering series is calculated. The recoil effect turns out to be reasonably small even at the physical value of M K /m N ≃ 0.5.

show abstract

“…[28] gives the value of theKd scattering length, obtained by the solution of the Faddeev equations with the one-channel energy-independent optical potential. The parameters of this potential were adjusted to reproduce the scattering lengths (22). The calculation, carried in Ref.…”

Section: The Role Of Recoil Effects For Kaonic Deuteriummentioning

confidence: 99%

Recoil corrections in antikaon-deuteron scattering

Mai

¹

,

Baru

²

,

Epelbaum

³

et al. 2015

View full text Add to dashboard Cite

The recoil retardation effect in the K − d scattering length is studied. Using the non-relativistic effective field theory approach, it is demonstrated that a systematic perturbative expansion of the recoil corrections in the parameter ξ = M K /m N is possible in spite of the fact that K − d scattering at low energies is inherently non-perturbative due to the large values of theKN scattering lengths. The first order correction to the K − d scattering length due to single insertion of the retardation term in the multiple-scattering series is calculated. The recoil effect turns out to be reasonably small even at the physical value of M K /m N ≃ 0.5.

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Pionic deuterium

Cited by 56 publications

References 151 publications

Light stops, blind spots, and isospin violation in the MSSM

Light stops, blind spots, and isospin violation in the MSSM

Recoil corrections in antikaon-deuteron scattering

Recoil corrections in antikaon-deuteron scattering

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