Quasielastic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>scattering

Kormanyos, C.; Peterson, R. J.; Shepard, J.R.; Wise, J.E.; Bart, S.; Chrien, R.E.; Lee, L; Clausen, Benjamin L.; Piekarewicz, J.; Barakat, M.B.; Hungerford, E. V.; Michael, RA; Hicks, K.; Kishimoto, T.

doi:10.1103/physrevc.51.669

Cited by 27 publications

(21 citation statements)

References 27 publications

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“…Some further experimental progress was made during the early 1990s, consisting mostly of measuring attenuation cross sections in K transmission experiments at the Brookhaven National Laboratory (BNL) Alternating Gradient Synchrotron (AGS) on deuterium and several other nuclear targets in the momentum range p lab 450-740 MeV=c [9][10][11][12] and of measuring K quasielastic scattering on several targets at 705 MeV=c [13]. New measurements of K elastic and inelastic differential cross sections on C and Ca at 715 MeV=c were reported in Ref.…”

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confidence: 99%

Traces of theΘ+Pentaquark inK+-Nucleus Dynamics

Gal

Friedman

2005

Phys. Rev. Lett.

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Long-standing anomalies in K(+)-nucleus integral cross sections could be resolved by extending the impulse-approximation trho optical-potential framework to incorporate K(+) absorption on pairs of nucleons. Substantially improved fits to the data at p(lab) approximately 500-700 MeV/c are obtained. An upper bound on the absorption cross section per nucleon is derived, sigmaabs((K(+))/A approximately 3.5 mb. We conjecture that the underlying microscopic absorption process is K(+) nN--> Theta+ N, where Theta(+) (1540) is the newly discovered exotic Y = 2, I = 0, Z = 1 pentaquark baryon, and estimate that sigma(K(+) d--> Theta(+) p) is a fraction of millibarn. Comments are made on Theta(+) production reactions on nuclei.

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confidence: 99%

Traces of theΘ+Pentaquark inK+-Nucleus Dynamics

Gal

Friedman

2005

Phys. Rev. Lett.

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“…In Figure 3 the calculations are normalized using A ef f = 21 which is the mean value extracted from experiment [9,10]. The calculations appearing in Figure 4 use A ef f = 24 which is the experimental upper limit.…”

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confidence: 99%

“…In particular, there is a persistant discrepancy between measured K + -nucleus elastic and total cross sections and theoretical results based on multiple scattering models which are expected to be accurate due again to the weakness of the K + N interaction [8]. Data for K + -nucleus quasielastic scattering from C, Ca and Pb at a laboratory K + momentum of 705 MeV/c have recently become available [9,10] . A preliminary theoretical analysis of the |q|= 300 and 500 MeV/c data for 12 C and 40 Ca has already appeared along with the data [9].…”

Section: Introductionmentioning

confidence: 99%

Comparison ofK+ande−quasielastic scatterin

Piekarewicz

Shepard

1995

Phys. Rev. C

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We formulate K + -nucleus quasielastic scattering in a manner which closely parallels standard treatments of e − -nucleus quasielastic scattering. For K + scattering, new responses involving scalar contributions appear in addition to the Coulomb (or longitudinal) and transverse (e, e ′ ) responses which are of vector character. We compute these responses using both nuclear matter and finite nucleus versions of the Relativistic Hartree Approximation to Quantum Hadrodynamics including RPA correlations. Overall agreement with measured (e, e ′ ) responses and new K + quasielastic scattering data for 40 Ca at |q| = 500 MeV/c is good. Strong RPA quenching is essential for agreement with the Coulomb response. This quenching is notably less for the K + cross section even though the new scalar contributions are even more strongly quenched than the vector contributions. We show that this "differential quenching" alters sensitive cancellations in the expression for the K + cross section so that it is reduced much less than the individual responses. We emphasize the role of the purely relativistic distinction between vector and scalar contributions in obtaining an accurate and consistent description of the (e, e ′ ) and K + data within the framework of our nuclear structure model.

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“…This finding has naturally raised the issue of what might be the consequences for QE scattering.A few results from the experiment performed at BNL, taken from Refs. [1,2], are displayed in Figures 1 and 2. In those papers the data have been compared to calculations in a variety of relativistic nuclear structure models (mean field, Hartree and random phase approximation (RPA), both in nuclear matter and finite nucleus), using a simple reaction mechanism in which the distortion of the strongly interacting kaons is accounted for through an effective number of nucleons participating in the reaction, N ef f , i. e.,where dσ K + N /dΩ is the elementary cross section and R(q, ω) the nuclear response function.…”

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confidence: 99%

Quasielastic K+ scattering in nuclei

Pace

1998

Nuclear Physics A

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Quasielastic (QE) studies at intermediate energies are an important tool to study both nucleonic and nuclear physics issues. In particular, the reasons to consider K + -nucleus scattering have been twofold. On the one hand, the elementary K + N cross section is relatively small compared to other hadronic probes, thus allowing the kaons to penetrate deeper inside the nucleus, making them more suitable to study collective effects. Furthermore, since the K + N cross section is dominated by the scalar-isoscalar channel, kaons turn out to be a quasi-pure probe of this mode. On the other hand, the excess of cross section, with respect to multiple scattering theory predictions, that has been found in K + -nucleus elastic scattering experiments is still unexplained and may be interpreted in terms of an enhancement of the in-medium K + N cross section, σ K + N . This finding has naturally raised the issue of what might be the consequences for QE scattering.A few results from the experiment performed at BNL, taken from Refs. [1,2], are displayed in Figures 1 and 2. In those papers the data have been compared to calculations in a variety of relativistic nuclear structure models (mean field, Hartree and random phase approximation (RPA), both in nuclear matter and finite nucleus), using a simple reaction mechanism in which the distortion of the strongly interacting kaons is accounted for through an effective number of nucleons participating in the reaction, N ef f , i. e.,where dσ K + N /dΩ is the elementary cross section and R(q, ω) the nuclear response function. The agreement might look good, but two observations are in order:i) In those calculations use has been made of the empirical dσ K + N /dΩ and of the "experimental" N ef f , the latter having been obtained by integrating the experimental QE cross sections without accounting for any background. The values for N ef f thus obtained are ∼ 30% higher than Glauber theory predictions. Note that it is rather difficult to interpret this increase of N ef f through a modification of the in-medium K + N cross section. A decrease of σ K + N would give rise to a larger N ef f , but should also reflect in a smaller dσ K + N /dΩ, making QE scattering little sensitive to the *

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QuasielasticK+scattering

Cited by 27 publications

References 27 publications

Traces of theΘ+Pentaquark inK+-Nucleus Dynamics

Traces of theΘ+Pentaquark inK+-Nucleus Dynamics

Comparison ofK+ande−quasielastic scatterin

Quasielastic K+ scattering in nuclei

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