Final-state interactions

We revisit the topic of triple-product asymmetries which probe CP violation through differential distributions. We construct distributions with well-defined discrete symmetry properties and characterize the asymmetries formed upon them. It is stressed that the simplest asymmetries may not be optimal. We explore systematic generalizations having limited reliance on the process dynamics and phase-space parametrization. They exploit larger fractions of the information contained in differential distributions and may lead to increased sensitivities to CP violation. Our detailed treatment of the case of spinless four-body decays paves the way for further experimental studies.

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“…Those two terms can receive several contributions whose absorptive parts [4,5] take the form of CP-even phases δ. One can then write…”

Section: A Differential Cp Violationmentioning

confidence: 99%

ProbingCPviolation systematically in differential distributions

Durieux

Grossman

2015

Phys. Rev. D

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“…The phase-space factor (ii) for a reaction 1 + 2 -+ 3 +4 --t 3 +(5 + 6) where 3 is the only observed particle, is given by 31,32) P(E) CC CJ%%,, +I",…”

Section: 3) Although the Parameter T(e) Is A Function Of E Onementioning

confidence: 99%

Reaction dependence of nuclear decay linewidths

et al. 1981

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Various light-and heavy-ion reactions, 20 < E i 100 MeV, have been used to study the reaction dependence of a-decay widths for *Be*(2+, 2.9 MeV) and '60*(1-, 9.6 MeV). Although slight differences (< 20 %) are found for the observed line shapes (F), the resonance widths inferred (F,) are self-consistent and indicate little if any reaction dependence (i 10 %). Near a decay threshold one may expect F < FR by 20 % or more, however, and thus care must be taken in comparing decay widths inferred from nuclear reactions with those from scattering resonances. Reduced formal a-decay widths of y: = 68Ok 100 keV (s = 4.8 fm) and 7: = 350+50 keV (S = 5.4 fm), corresponding to 19: = 0.50 and 6: = 0.49 are deduced for sBe*(2+, 2.9 MeV) and 16G*(]-, 9.6 MeV) using the nuclear-reaction Fa values and a particular set of a-nucleus potentials.

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“…21) Now only the nuclear part of the interaction is taken into account in the simulation and the agreement for the 3-body cross section is fairly good (Figs. 5 a),b),c)).…”

Section: §1 Introductionmentioning

confidence: 88%

Coulomb Suppression Effects in the Proton-Proton Elastic Scattering Extracted from the²H(p,pp)nReaction

Spitaleri

Musumarra

Calabretta

et al. 2004

Prog. Theor. Phys. Suppl.

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The Trojan Horse Method (THM) 1)-12) is an indirect method that allows twobody cross section measurements at energy far below the Coulomb barrier, starting from a three-body reaction.It is possible to extract a two-body cross section (a + b → c + C) from a measured three-body one (a + A → c + C + x) where the chosen nucleus A has a high probability to be clusterized into x⊕b and x behaves as a spectator to the process (quasi-free mechanism). If the reaction energy is higher than the Coulomb barrier in the entrance channel of the three-body reaction, the two-body interaction can be considered as taking place inside the nuclear field. Therefore, in this picture, the extracted two-body cross section refers to the nuclear interaction only, the Coulomb barrier being already overcome in the entrance channel. 4)The present paper reports on the application of this method to the p-p scattering, the simplest case where the Coulomb suppression can be observed. The p-p cross section is well-known. Its energy trend is observed to be very similar to that of n-n or p-n systems (≈ 1/v) except at low proton energies where a deep minimum shows up (E lab = 382.43 keV, θ cm = 90 • ) due to the interference between the nuclear and the Coulomb scattering amplitudes. 13) So, if one extracts the p-p cross section, under the THM assumptions from a suitable three-body one, like the 2 H(p, pp)n reaction, this extracted cross section is expected to show Coulomb suppression effects. For this reason, the 2 H(p, pp)n reaction was studied at Laboratori Nazionali del Sud (LNS), INFN, Catania, at proton energy higher than the p+d Coulomb barrier and such that the p-p relative energy in the exit channel is in the region of the deep minimum.

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Final-state interactions

Cited by 44 publications

References 238 publications

ProbingCPviolation systematically in differential distributions

ProbingCPviolation systematically in differential distributions

Reaction dependence of nuclear decay linewidths

Coulomb Suppression Effects in the Proton-Proton Elastic Scattering Extracted from the²H(p,pp)nReaction

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Final-state interactions

Cited by 44 publications

References 238 publications

ProbingCPviolation systematically in differential distributions

ProbingCPviolation systematically in differential distributions

Reaction dependence of nuclear decay linewidths

Coulomb Suppression Effects in the Proton-Proton Elastic Scattering Extracted from the2H(p,pp)nReaction

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Product

Resources

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Coulomb Suppression Effects in the Proton-Proton Elastic Scattering Extracted from the²H(p,pp)nReaction