We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2 < Q^2 < 5.5 GeV^2. The data have been used to accurately perform 167 Rosenbluth-type longitudinal / transverse separations. The precision R = sigma_L / sigma_T data are presented here, along with the first separate values of the inelastic structure functions F_1 and F_L in this regime. The resonance longitudinal component is found to be significant, both in magnitude and in the existence of defined mass peaks. Additionally, quark-hadron duality is here observed above Q^2 = 1 GeV^2 in the separated structure functions independently.

Sigma

Duality (order theory)

Momentum transfer

10.48550/arxiv.nucl-ex/0410027

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Citations (3)

Measurement of muon plus proton final states in $\nu_{\mu}$ Interactions on Hydrocarbon at $ $ = 4.2 GeV

arXiv (Cornell University) (2014)

T. Walton M. Betancourt L. Aliaga O. Altinok A. Bodek

Source

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Citations (1)

Measurement of the free neutron-proton analyzing power and spin transfer parameters in the charge exchange region at 790 MeV

R. D. Ransome

The free neutron-proton analyzing power and the spin transfer parameters (K/sub NN/, K/sub SS/, K/sub SL/, and K/sub LL/) were measured at the Los Alamos Meson Physics Facility at 790 MeV between 165/sup 0/ and 180/sup 0/ center of mass. A 40% polarized neutron beam incident on a liquid hydrogen target was used. The recoil protons were momentum analyzed with a magnetic spectrometer to isolate elastic scatters. A large solid angle carbon polarimeter was used to measure the proton polarization. The measurements are the first at this energy and are in basic agreement with pre-existing phase shift solutions. The proton-carbon analyzing power was measured between 500 and 750 MeV. An empirical fit to the proton-carbon analyzing power between 100 and 750 MeV was done.

Polarimeter

10.2172/6293213

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Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering

Physical Review Letters (2006)

C. Muñoz Camacho A. Camsonne M. Mazouz C. Ferdi G. Gavalian

We present the first measurements of the $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}ep\ensuremath{\gamma}$ cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The ${Q}^{2}$ dependence (from 1.5 to $2.3\text{ }\text{ }{\mathrm{GeV}}^{2}$) of the helicity-dependent cross section indicates the twist-2 dominance of DVCS, proving that generalized parton distributions (GPDs) are accessible to experiment at moderate ${Q}^{2}$. The helicity-independent cross section is also measured at ${Q}^{2}=2.3\text{ }\text{ }{\mathrm{GeV}}^{2}$. We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.

Section (typography)

Scaling law

10.1103/physrevlett.97.262002

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Citations (172)

High-Statistics Measurement of Antineutrino Quasielastic-like scattering at $E_ν\sim$ 6~GeV on a Hydrocarbon Target

arXiv (Cornell University) (2022)

A. Bashyal S. Akhter Z. Ahmad Dar F. Akbar V. Ansari

We present measurements of the cross section for anti-neutrino charged-current quasielastic-like scattering on hydrocarbon using the medium energy (ME) NuMI wide-band neutrino beam peaking at $\sim 6$ GeV. The cross section measurements are presented as a function of the longitudinal momentum ($p_{||}$) and transverse momentum ($p_{T}$) of the final state muon. This work complements our previously reported high statistics measurement in the neutrino channel and extends the previous anti-neutrino measurement made in the low energy (LE) beam at neutrino energy($$) $\sim$ 3.5 GeV to $p_{T}$ of 2.5 GeV/c. Current theoretical models do not completely describe the data in this previously unexplored high $p_{T}$ region. The single differential cross section as a function of four momentum transfer ($Q^{2}_{QE}$) now extends to 4 GeV$^2$ with high statistics. The cross section as a function of $Q^{2}_{QE}$ shows that the tuned simulations developed by the MINERvA collaboration that agreed well with the low energy beam measurements do not agree as well with the medium energy beam measurements. Newer neutrino interaction models such as the GENIE 3 tunes are better able to simulate the high $Q^{2}_{QE}$.

Muon neutrino

Charged current

Momentum (technical analysis)

10.48550/arxiv.2211.10402

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Measurement of Electron Neutrino and Antineutrino Cross Sections at Low Momentum Transfer

arXiv (Cornell University) (2023)

Sarah Henry H. Su S. Akhter Z. Ahmad Dar V. Ansari

Accelerator based neutrino oscillation experiments seek to measure the relative number of electron and muon neutrinos and antineutrinos at different $L/E$ values. However high statistics studies of neutrino interactions are almost exclusively measured using muon neutrinos and antineutrinos since the dominant flavor of neutrinos produced by accelerator based beams are of the muon type. This work reports new measurements of electron neutrino and antineutrino interactions in hydrocarbon, obtained by strongly suppressing backgrounds initiated by muon flavor neutrinos and antineutrinos. Double differential cross sections as a function of visible energy transfer, $E_\text{avail}$, and transverse momentum transfer, $p_T$, or three momentum transfer, $q_3$ are presented.

Electron neutrino

Muon neutrino

Momentum transfer

10.48550/arxiv.2312.16631

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G**p(E) / G**p(M) for bound protons: first results for O-16 with the recoil polarization technique

arXiv (Cornell University) (2000)

S. Malov J. R. Calarco S. Platchkov J. Berthot R. Holmes

The first (e,e'p) polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the polarization of protons ejected in the reaction 16O(e,e'p) were measured in quasielastic perpendicular kinematics at a Q^2 of 0.8 (GeV/c)^2. The data are in good agreement with state of the art calculations, but do not exclude possible changes in the ratio of the electric to magnetic form factors of the nucleon in the nuclear medium at the level of recent theoretical predictions.

Recoil

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Measurements of the inclusive neutrino and antineutrino charged current cross sections in MINERvA using the low- ν flux method

Physical review. D/Physical review. D. (2016)

J. Devan L. Ren L. Aliaga O. Altinok L. Bellantoni

The total cross sections are important ingredients for the current and future neutrino oscillation experiments. We present measurements of the total charged-current neutrino and antineutrino cross sections on scintillator (CH) in the NuMI low-energy beamline using an in situ prediction of the shape of the flux as a function of neutrino energy from 2–50 GeV. This flux prediction takes advantage of the fact that neutrino and antineutrino interactions with low nuclear recoil energy (ν) have a nearly constant cross section as a function of incident neutrino energy. This measurement is the lowest energy application of the low-ν flux technique, the first time it has been used in the NuMI antineutrino beam configuration, and demonstrates that the technique is applicable to future neutrino beams operating at multi-GeV energies. The cross section measurements presented are the most precise measurements to date below 5 GeV.Received 18 October 2016DOI:https://doi.org/10.1103/PhysRevD.94.112007Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasNucleus-neutrino interactionsParticles & Fields

Charged current

Fermilab

10.1103/physrevd.94.112007

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Citations (32)

Single spin asymmetries of inclusive hadrons produced in electron scattering from a transversely polarized3He target

Physical Review C (2014)

K. Allada Y. X. Zhao K. Aniol J. R. M. Annand T. Averett

We report the first measurement of target single-spin asymmetries (A$_N$) in the inclusive hadron production reaction, $e~$+$~^3\text{He}^{\uparrow}\rightarrow h+X$, using a transversely polarized $^3$He target. The experiment was conducted at Jefferson Lab in Hall A using a 5.9-GeV electron beam. Three types of hadrons ($\pi^{\pm}$, $\text{K}^{\pm}$ and proton) were detected in the transverse hadron momentum range 0.54 $

10.1103/physrevc.89.042201

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Citations (44)

Multiproton final states in positive pion absorption below theΔ(1232)resonance

Physical Review C (2000)

R. A. Giannelli B. G. Ritchie J. M. Applegate E. M. Beck Jimmy Beck

Inclusive cross sections for positive pion absorption leading to final states including two or more protons have been measured with a large solid angle detector for incident pion energies from 30 to 135 MeV for targets with $A=2--208.$ The mass dependences for the inclusive $({\ensuremath{\pi}}^{+},2p),$ $({\ensuremath{\pi}}^{+},3p),$ and total absorption cross sections for multiproton final states were found to be proportional to ${A}^{n}$ with $n\ensuremath{\approx}0.5.$ These cross sections also were observed to have an energy dependence at energies below 150 MeV reflective of the importance of the $\ensuremath{\Delta}(1232)$ resonance, similar to that observed for $\ensuremath{\pi}\stackrel{\ensuremath{\rightarrow}}{d}\mathrm{pp}.$ The inclusive cross sections for $({\ensuremath{\pi}}^{+},4p)$ were found to be less than 10 mb for all targets at all energies. Estimates were also obtained for cross sections for pion absorption leading to $2p1n$ and $3p1n$ final states. Quasideuteron absorption contributions increase slowly with A, and the energy dependence of those contributions mirrors that for $\ensuremath{\pi}\stackrel{\ensuremath{\rightarrow}}{d}\mathrm{pp}.$ The data obtained here for multiproton final states indicate that a significant fraction of absorption events, increasing with A, most likely arises from final states containing fewer than two protons.

10.1103/physrevc.61.054615

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Citations (17)