Neutrino-nucleus quasifree neutral current reactions and the nucleon strange quark content

Horowitz, C. J.; Kim, Hungchong; Murdock, D. P.; Pollock, Steven J.

doi:10.1103/physrevc.48.3078

Cited by 42 publications

(109 citation statements)

References 23 publications

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“…Indeed, the world-average value of M A (1.032 ± 0.036 GeV) that the BNL group has used is significantly different from the one [1.09 ± 0.03 (stat)±0.02 (syst) GeV] extracted later from a charged-current experiment [8]. Thus, this large difference in M A is sufficient to change the value of g s A extracted from the BNL experiment and the conclusion of a nonzero strange-quark content from our previous neutral-current study [7].…”

Section: Introductionmentioning

confidence: 66%

“…Indeed, even in the impulse with M * p calculation -which generates the smallest change -a 10 percent increase in the value of M A is required. This 10 percent uncertainty in the value of M A could complicate the extraction of strange-quark matrix elements from experimental studies of neutral weak form factors [7] .…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, even in this best-case scenario a 10 percent uncertainty in M A persists. With this extra 10 percent uncertainty, the BNL experiment [4] by itself no longer provides strong evidence for a nonzero strangeness content of the nucleon [7].…”

Section: Discussionmentioning

confidence: 99%

“…Unfortunately, the extraction of g s A from the Brookhaven National Laboratory (BNL) experiment is complicated by low statistics [4]. Moreover, there is a strong correlation between the extracted value of g s A and the axial mass M A obtained from dipole fits to the axial-vector form factor [6,7]. Indeed, the world-average value of M A (1.032 ± 0.036 GeV) that the BNL group has used is significantly different from the one [1.09 ± 0.03 (stat)±0.02 (syst) GeV] extracted later from a charged-current experiment [8].…”

Section: Introductionmentioning

confidence: 99%

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Relativistic nuclear structure effects in quasielastic neutrino scattering

1995

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Charged-current cross sections are calculated for quasielastic neutrino and antineutrino scattering using a relativistic meson-nucleon model. We examine how nuclear-structure effects, such as relativistic random-phaseapproximation (RPA) corrections and momentum-dependent nucleon selfenergies, influence the extraction of the axial form factor of the nucleon. RPA corrections are important only at low-momentum transfers. In contrast, the momentum dependence of the relativistic self-energies changes appreciably the value of the axial-mass parameter, M A , extracted from dipole fits to the axial form factor. Using Brookhaven's experimental neutrino spectrum we estimate the sensitivity of M A to various relativistic nuclear-structure effects. *

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Section: Introductionmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relativistic nuclear structure effects in quasielastic neutrino scattering

1995

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“…This fact has stimulated a considerable amount of theoretical work aiming at the description of nuclear effects in NC nucleon knockout reactions. The relativistic Fermi gas description of the nucleus has been adopted in many calculations [13,14,15,16]; others use wave functions for the bound nucleons, obtained in relativistic mean-field models [17,18,19,20]. The shell model [15,16] and the continuum random-phase approximation [21,22] have also been applied.…”

Section: Introductionmentioning

confidence: 99%

Neutral current neutrino-nucleus interactions at intermediate energies

2006

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We have extended our model for charged current neutrino-nucleus interactions developed in Phys. Rev. C 73, 065502 (2006) to neutral current reactions. For the elementary neutrino-nucleon interaction, we take into account quasielastic scattering, ∆ excitation and the excitation of the resonances in the second resonance region. Our model for the neutrino-nucleus collisions includes in-medium effects such as Fermi motion, Pauli blocking, nuclear binding, and final-state interactions. They are implemented by means of the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) coupledchannel transport model. This allows us to study exclusive channels, namely pion production and nucleon knockout. We find that final-state interactions modify considerably the distributions through rescattering, charge-exchange, and absorption. Side-feeding induced by charge-exchange scattering is important in both cases. In the case of pions, there is a strong absorption associated with the in-medium pionless decay modes of the ∆, while nucleon knockout exhibits a considerable enhancement of low energy nucleons due to rescattering. At neutrino energies above 1 GeV, we also obtain that the contribution to nucleon knockout from ∆ excitation is comparable to that from quasielastic scattering.

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Heavy neutrino decays at MiniBooNE

Masip

Masjuan

Meloni

2013

J. High Energ. Phys.

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It has been proposed that a sterile neutrino ν h with m h ≈ 50 MeV and a dominant decay mode ν h → νγ may be the origin of the experimental anomaly observed at LSND. We define a particular model that could also explain the MiniBooNE excess consistently with the data at other neutrino experiments (radiative muon capture at TRIUMF, T2K, or single photon at NOMAD). The key ingredients are (i) its long lifetime (τ h ≈ 3−7 × 10 −9 s), which introduces a 1/E dependence with the event energy, and (ii) its Dirac nature, which implies a photon preferably emitted opposite to the beam direction and further reduces the event energy at MiniBooNE. We show that these neutrinos are mostly produced through electromagnetic interactions with nuclei, and that T2K observations force BR(ν h → ν τ γ) ≤ 0.01 ≈ BR(ν h → ν µ γ). The scenario implies then the presence of a second sterile neutrino ν h ′ which is lighter, longer lived and less mixed with the standard flavors than ν h . Since such particle would be copiously produced in air showers through ν h → ν h ′ γ decays, we comment on the possible contamination that its photon-mediated elastic interactions with matter could introduce in dark matter experiments.

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Neutrino-nucleus quasifree neutral current reactions and the nucleon strange quark content

Cited by 42 publications

References 23 publications

Relativistic nuclear structure effects in quasielastic neutrino scattering

Relativistic nuclear structure effects in quasielastic neutrino scattering

Neutral current neutrino-nucleus interactions at intermediate energies

Heavy neutrino decays at MiniBooNE

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