Precision Measurement of Charge Symmetry Breaking in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">np</mml:mi></mml:math>Elastic Scattering at 347 MeV

Abegg, R.; Berdoz, A.; Bírchall, J.; Campbell, J. R.; Davis, C. A.; Delheij, P. P. J.; Gan, L.; Green, P.W.; Greeniaus, L.G.; Healey, D.; Helmer, R. L.; Kolb, N. R.; Korkmaz, E.; Lee, L.; Lévy, C.; Li, J.; Miller, C. A.; Opper, A. K.; Page, S. A.; Postma, H.; Ramsay, W. D.; Soukup, J.; Stinson, G. M.; Oers, W. T. H. van; Zelenski, A.; Zhao, J.

doi:10.1103/physrevlett.75.1711

Cited by 18 publications

(23 citation statements)

References 23 publications

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“…Three experiments exist on CSB in neutron-proton scattering where ∆A was measured [17][18][19]. Their results, together with theoretical predictions of ∆A TRI [16], based on updated experimental and theoretical values collected in Ref.…”

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confidence: 98%

“…Their results, together with theoretical predictions of ∆A TRI [16], based on updated experimental and theoretical values collected in Ref. [19] are listed in Table I.…”

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confidence: 99%

“…Numerical values of the coefficients K J for angles and energies of available CBS experiments [17][18][19], evaluated with phase parameters and amplitudes obtained from [23], are listed in Table II together with the corresponding values forK(α) = ∆/ḡ ρ . The 183 MeV results are averaged over the angular range of the measurement as the experimental value ∆A [24].…”

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confidence: 99%

“…Fortunately, however, this affects only the analysis of the 183 MeV measurement [18]. The others are, at the angles measured, essentially insensitive to this contribution and thus to its uncertainty [19,26]. Since the limit (12) is dominated by the 347 MeV result it is therefor not affected by this uncertainty.…”

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confidence: 99%

“…I would like to thank W.T.H. van Oers for bringing the insensitivity of the TRIUMF CSB measurements [17,19] to ρ − ω mixing to my attention, and P. Herczeg for valuable comments. TABLES TABLE I.…”

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confidence: 99%

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Constraints on Parity-Even Time Reversal Violation in the Nucleon-Nucleon System and Its Connection to Charge Symmetry Breaking

Simonius¹

1997

Phys. Rev. Lett.

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Parity-even time reversal violation (TRV) in the nucleon-nucleon interaction is reconsidered. The TRV r-exchange interaction on which recent analyses of measurements are based is necessarily also charge symmetry breaking (CSB). Limits on its strength g r relative to regular r exchange are extracted from recent CSB experiments in neutron-proton scattering. The result g r # 6.7 3 10 23 (95% C.L.) is considerably lower than limits inferred from direct TRV tests in nuclear processes. Properties of a 1 exchange and limit imposed by the neutron electric dipole moment are briefly discussed. [S0031-9007(97) Investigations of time-reversal violation (TRV) orders of magnitude above the weak interaction scale and thus necessarily of nonweak origin continue to enjoy popularity in nuclear and nucleon-nucleon physics [1][2][3][4][5][6][7][8].Since otherwise its presence would long have been detected in experimental investigations of parity violation, TRV above the weak interaction level must be parity even. This imposes severe restrictions on the possible ways a TRV interaction can be constructed. Indeed, contrary to the case of a parity-odd TRV interaction which naturally arises in the u term of QCD, no "natural" implementation of P-even TRV is possible [2,[9][10][11].Also in an effective theory at the hadronic level, parity conservation imposes restrictions which render most of the experimental searches for P-even TRV rather elusive. For boson exchange interactions in the nucleon-nucleon system these constraints were analyzed in Ref. [12]. The main features, deduced for on-shell amplitudes, are the following:(i) P-even TRV is restricted to partial waves with total angular momentum J $ 1.(ii) Total angular momentum zero exchange (one p or s, etc.) cannot contribute.(iii) Natural parity exchange (r) must be charged and necessarily contains the nucleon-nucleon isovector charge exchange operator 2i͑t 1 1 t 2 2 2 t 2 1 t 1 2 ͒ ͑ t 1 3 t 2 ͒ z and thus cannot contribute in the nn or pp system [13].Restrictions due to parity conservation are found also directly in elastic scattering of nucleons on a spin zero nucleus: After decomposition into angular momentum and parity eigenstates the scattering matrix is diagonal and thus symmetric and automatically time-reversal invariant. This shows also that a T -odd interaction introduced at the nucleon-nucleon level is suppressed in nuclei since it is ineffective in the interaction of single nucleons with the spin zero core [14]. This ineffectiveness, emphasized already in Ref.[15] has recently been verified also for processes in heavy nuclei governed by the statistical model [3,4], for which high sensitivity has long been claimed, as well as in other calculations [5,7,8].Since charged r is the lightest meson meeting the constraints (ii) and (iii) above, it provides the longest range possible P-even TRV one boson exchange interaction between nucleons. Following [3] most recent analyses of P-even TRV in nuclear systems are therefore based on the r-exchange interaction proposed in Refs. [12,1...

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confidence: 98%

“…Their results, together with theoretical predictions of ∆A TRI [16], based on updated experimental and theoretical values collected in Ref. [19] are listed in Table I.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Constraints on Parity-Even Time Reversal Violation in the Nucleon-Nucleon System and Its Connection to Charge Symmetry Breaking

Simonius¹

1997

Phys. Rev. Lett.

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Rho-omega mixing, vector meson dominance and the pion form-factor

O'Connell

Pearce

Thomas

et al. 1997

Progress in Particle and Nuclear Physics

224

246

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We review the current status of rho-omega mixing and discuss its implication for our understanding of charge-symmetry breaking. In order to place this work in context we also review the photon-hadron coupling within the framework of vector meson dominance. This leads naturally to a discussion of the electromagnetic form-factor of the pion and of nuclear shadowing.Comment: 52 pages with 14 figures. This published version includes updated references and minor changes to tex

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Resurrection of charge symmetry violation for 〈ϱ0|Hem|ω〉 ∼ −5000 MeV2

Scadron

1997

Physics Letters B

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Precision Measurement of Charge Symmetry Breaking innpElastic Scattering at 347 MeV

Abstract: Charge symmetry breaking in n p elastic scattering at 347 MeV has been measured with high precision.

Cited by 18 publications

References 23 publications

Constraints on Parity-Even Time Reversal Violation in the Nucleon-Nucleon System and Its Connection to Charge Symmetry Breaking

Constraints on Parity-Even Time Reversal Violation in the Nucleon-Nucleon System and Its Connection to Charge Symmetry Breaking

Rho-omega mixing, vector meson dominance and the pion form-factor

Resurrection of charge symmetry violation for 〈ϱ0|Hem|ω〉 ∼ −5000 MeV2

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