Quasifree pion electroproduction from nuclei in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Δ</mml:mi></mml:math>region

Lee, Frank; Bennhold, C.; Wright, L. E.

doi:10.1103/physrevc.55.318

Cited by 7 publications

(15 citation statements)

References 32 publications

(51 reference statements)

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“…In the coplanar setup, we adopt the kinematics settings used in Ref. 29,30 . First, we implement the setting whereby E k , ω, Q 2 , θ ′ 1 , and p m are specified as input variables.…”

Section: Resultsmentioning

confidence: 99%

“…As such, we develop our model of the nuclear weak transition matrix element for KY-production based on the photo-and electroproduction of mesons in association with baryons from nuclei. 29,30,31,32,33 In doing so, we invoke the impulse approximation whereby one assumes that the incident neutrino interacts with a single bound (off-shell) nucleon inside nuclear medium via the exchange of a single weak gauge boson, and subsequently a pseudoscalar meson is produced in association with hyperon. The rest of the nucleons behave like spectators and make up the residual nucleus.…”

Section: Model For Nuclear Weak Transitionmentioning

confidence: 99%

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Associated Hyperon–kaon Production via Neutrino–nucleus Scattering

Adera

Ventel

2011

Int. J. Mod. Phys. E

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We present the investigation of the neutrino-induced strangeness associated production on nuclei in the relativistic plane wave impulse approximation (RPWIA) framework at the intermediate neutrino energies. In this study, the elementary hadronic weak amplitudes are embedded inside the nuclear medium for the description of the exclusive channels of neutrino-nucleus interactions. These amplitudes are extracted using a modeldependent evaluation of the hadronic vertex using the Born term approximation in which the application of the Cabibbo V-A theory and SU(3) symmetry are assumed to be valid. The nuclear effects are included via the bound state wavefunctions of the nucleon obtained from the relativistic mean field (RMF) models. Two kinematics settings are used to examine various distributions of the differential cross section in the rest frame of the target nuclei. The numerical results are obtained for the neutrino-induced chargedcurrent (CC) K + Λ-production on bound neutrons in 1s 1/2 and 1p 3/2 orbitals of 12 C.The angular distributions are forward peaked under both kinematic settings, whereas under the quasifree setting the cross sections tend mimic the missing momentum distribution of the bound nucleon inside the nucleus.

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“…In the coplanar setup, we adopt the kinematics settings used in Ref. 29,30 . First, we implement the setting whereby E k , ω, Q 2 , θ ′ 1 , and p m are specified as input variables.…”

Section: Resultsmentioning

confidence: 99%

Section: Model For Nuclear Weak Transitionmentioning

confidence: 99%

Associated Hyperon–kaon Production via Neutrino–nucleus Scattering

Adera

Ventel

2011

Int. J. Mod. Phys. E

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“…The cross section for pion production on an unpolarized nucleus with an unpolarized electron can be expressed [15] as a flux factor ÿ v times the cross section for absorption of a virtual photon:…”

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confidence: 99%

“…The data are compared to DWIA calculations and, in order to investigate the influence of distortions, also to plane-wave impulse approximation (PWIA) calculations, performed with the code of Lee [15], which uses the Blomqvist-Laget pion production operator [17]. In these calculations the reaction mechanism is assumed to be quasifree production.…”

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confidence: 99%

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Quasifreeπ0andπ−Electroproduction onHe4in

et al. 2005

Phys. Rev. Lett.

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The reactions 4He(e, e' p3He)pi- and 4He(e, e' p3He)pi0 were studied simultaneously, and for the first time, in a large kinematical domain including the Delta-resonance region. This was achieved by detecting the recoiling 3He and 3H nuclei instead of the emitted pions. The dependences of the cross section on the recoil momentum p(rec), the invariant mass WpiN, and the direction thetapi,q' and phipi,q' of the produced pion, are globally well described by the results of (quasifree) distorted-wave impulse approximation calculations. However, in the Delta-resonance region there are clear discrepancies, which point to medium modifications of the Delta in 4He.

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Polarization observables in electronuclear two-nucleon knockout

Ryckebusch¹,

Nespen²,

Debruyne³

1998

Physics Letters B

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Differential (e,e ′ pp) measurements are presently recognized as a way of studying short-range correlations in finite nuclei. The ( e,e ′ pp) and ( e,e ′ pn) differential cross section and polarization observables are studied in a microscopic model that accounts for the short-range correlations, outgoing-nucleon distortions, meson-exchange and ∆-isobar currents. It is pointed out that polarization observables represent an attractive alternative for absolute electronuclear two-nucleon knockout measurements. In the polarization transfer P ′ t for ( e,e ′ pp), the effect of central shortrange correlations is predicted to be large while at the same time the final-state interaction effects are small.Keywords : electronuclear nucleon production ; polarization observables For long, polarization degrees of freedom have been advocated as an attractive way of obtaining nucleon and nuclear structure information from exclusive electron scattering experiments. Often, polarization observables allow for accessing very specific combinations of structure functions with transparent physical interpretations. Recently explored examples include the precise measurement of the neutron electromagnetic form factors for which extensive programs were set up at the intermediate-energy electron accelerator facilities MAMI, BATES and TJNAF. In these neutron form factor studies, polarized electron beams are used in combination with either a polarized target ( 3 He( e,e ′ )) or an ejectile polarimeter (d( e,e ′ n)p). Although various electronuclear reactions, like the semi-inclusive eA−→ e ′ pX [1] and the inclusive (e,e ′ ) [2,3], have been shown to exhibit some sensitivity to the short-range structure of finite nuclei, the triple-coincidence (e,e ′ pp) reaction, albeit a rather involving coincidence reaction, is probably one of the most direct ways of probing the two-nucleon correlations [4]. Not only does the electromagnetic interaction avoid complications with respect to the initial-state interaction, the measured properties of the two detected protons makes it possible to reconstruct the characteristics of the correlated diproton in the target nucleus. Recently, it was experimentally verified [5][6][7] that even at relatively low values of the four-momentum transfer (Q 2 ≤ 0.12 GeV 2 ) and selected kinematics the (e,e ′ pp) reaction is dominated by photoabsorption on 1 S 0 diprotons [6,7]. This observation confirms the potential of the exclusive (e,e ′ pp) reaction to probe the short-range part of the two-nucleon correlations in the nuclear medium. At the same time, it is now widely recognized that electromagnetic production of a ∆ 33 resonance with subsequent π 0 decay and reabsorption on a proton represents an important competing mechanism that also feeds the (e,e ′ pp) reaction. Accordingly, it is of the utmost importance to find observables that allow for an unambiguous determination of the short-range correlation effects out of the background of competing processes. As the (e,e ′ pp) strength generated through intermediate ∆ 33 creat...

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Quasifree pion electroproduction from nuclei in theΔregion

Cited by 7 publications

References 32 publications

Associated Hyperon–kaon Production via Neutrino–nucleus Scattering

Associated Hyperon–kaon Production via Neutrino–nucleus Scattering

Quasifreeπ0andπ−Electroproduction onHe4in

Polarization observables in electronuclear two-nucleon knockout

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