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Title: Exploring Nucleon Spin Structure Through Neutrino Neutral-Current Interactions in MicroBooNE

Abstract

The net contribution of the strange quark spins to the proton spin, $$\Delta s$$, can be determined from neutral current elastic neutrino-proton interactions at low momentum transfer combined with data from electron-proton scattering. The probability of neutrino-proton interactions depends in part on the axial form factor, which represents the spin structure of the proton and can be separated into its quark flavor contributions. Low momentum transfer neutrino neutral current interactions can be measured in MicroBooNE, a high-resolution liquid argon time projection chamber (LArTPC) in its first year of running in the Booster Neutrino Beamline at Fermilab. The signal for these interactions in MicroBooNE is a single short proton track. We present our work on the automated reconstruction and classification of proton tracks in LArTPCs, an important step in the determination of neutrino- nucleon cross sections and the measurement of $$\Delta s$$.

Authors:
ORCiD logo [1]
  1. New Mexico State U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
MicroBooNE
OSTI Identifier:
1352041
Report Number(s):
arXiv:1702.00854; FERMILAB-CONF-17-070-ND
1512109
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 22nd International Symposium on Spin Physics, Urbana, IL, USA, 09/25-09/30/2016
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Woodruff, Katherine. Exploring Nucleon Spin Structure Through Neutrino Neutral-Current Interactions in MicroBooNE. United States: N. p., 2017. Web.
Woodruff, Katherine. Exploring Nucleon Spin Structure Through Neutrino Neutral-Current Interactions in MicroBooNE. United States.
Woodruff, Katherine. Thu . "Exploring Nucleon Spin Structure Through Neutrino Neutral-Current Interactions in MicroBooNE". United States. doi:. https://www.osti.gov/servlets/purl/1352041.
@article{osti_1352041,
title = {Exploring Nucleon Spin Structure Through Neutrino Neutral-Current Interactions in MicroBooNE},
author = {Woodruff, Katherine},
abstractNote = {The net contribution of the strange quark spins to the proton spin, $\Delta s$, can be determined from neutral current elastic neutrino-proton interactions at low momentum transfer combined with data from electron-proton scattering. The probability of neutrino-proton interactions depends in part on the axial form factor, which represents the spin structure of the proton and can be separated into its quark flavor contributions. Low momentum transfer neutrino neutral current interactions can be measured in MicroBooNE, a high-resolution liquid argon time projection chamber (LArTPC) in its first year of running in the Booster Neutrino Beamline at Fermilab. The signal for these interactions in MicroBooNE is a single short proton track. We present our work on the automated reconstruction and classification of proton tracks in LArTPCs, an important step in the determination of neutrino- nucleon cross sections and the measurement of $\Delta s$.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 02 00:00:00 EST 2017},
month = {Thu Feb 02 00:00:00 EST 2017}
}

Conference:
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  • The MicroBooNE Experiment at the Fermi National Accelerator Laboratory, an 89-ton active mass liquid argon time projection chamber, affords a unique opportunity to observe low-more » $Q^2$ neutral-current neutrino-proton scattering events. Neutral-current neutrino-proton scattering at $Q^2 < 1$ GeV$^2$ is dominated by the proton's axial form factor, which can be written as a combination of contributions from the up, down, and strange quarks: $$G_A(Q^2) = \frac{1}{2}[-G_A^u(Q^2)+G_A^d(Q^2)+G_A^s(Q^2)]$$. The contribution from up and down quarks has been established in past charged-current measurements. The contribution from strange quarks at low $Q^2$ remains unmeasured; this is of great interest since the strange quark contribution to the proton spin can be determined from the low-$Q^2$ behavior: $$\Delta S = G_A^s(Q^2=0)$$. MicroBooNE began operating in the Booster Neutrino Beam in October 2015. I will present the status in observing isolated proton tracks in the MicroBooNE detector as a signature for neutral-current neutrino-proton events. The sensitivity of the MicroBooNE experiment for measuring the strange quark contribution to the proton spin will be discussed.« less
  • Results of measuring Neutral and Charged Current, neutrino-nucleon interactions, using a Wide Band neutrino beam at Fermilab are presented. The Neutral Current structure functions are measured (relative to the Charged Current structure functions) to determine if sufficient evidence exists for neutrally charged constituents within the nucleon, which are unobserved in Charged Current interactions. The structure function comparison does not utilize the usual Bjorken scaling variables, but rather, the quantitymore » $$E\theta^2$$ , calculated from measurement of the recoil hadronic system. Data indicate no difference between the Neutral and Charged Current structure functions. Based upon a corrected data sample of 2850 Neutral and 8832 Charged Current events, we measure an integrated ratio; $$R_{\nu}$$ = 0.323 ± 0.007 (stat.)± 0.025 (sys.), which is v consistent with a value of $$sin^2 \theta_w$$ = 0.217 ± 0.032 (stat.) ± 0.021 (sys.).« less
  • Results of measuring Neutral and Charged Current, neutrino-nucleon interactions using a Wide Band neutrino beam at Fermilab are presented. The Neutral Current structure functions are measured (relative to the Charged Current structure functions) to determine if sufficient evidence exists for neutrally charged constituents within the nucleon, which are unobserved in Charged Current interactions. The structure function comparison does not utilize the usual Bjorken scaling variables, but rather, the quantity E Theta S, calculated from measurement of the recoil hadronic system. Data indicate no difference between the Neutral and Charged Current structure functions. Based upon a corrected data sample of 2850more » Neutral and 8832 Charged Current events, the author measures an integrated ratio; R/sub nu/= 0.323 +/- 0.007(stat.) +/- 0.025(sys.), which is consistent with a value of sinS Theta/sub w/ = 0.217 +/- 0.032 (stat.) +/- 0.021 (sys.).« less
  • It may appear unusual to have a contribution on neutrino scattering at a school devoted to electromagnetic probes, as the neutrino has no known electromagnetic couplings. However, as a means to examine the hidden flavor currents in the nucleon, the recent results observed for the spin structure function of the nucleon have focused attention on the nucleon`s neutral weak currents (NWC). When an electromagnetic probe is scattered elastically from a nucleon, the NWC interactions are observable only through the detection of very small (> 10{sup {minus}6}) parity-violating processes. In the case of neutrino scattering, the NWC is the dominant coupling.more » In what follows it will be shown how the nucleon`s vector and axial vector form factors arising from strange quark currents can be measured via neutrino elastic scattering. Preliminary results from the Large Scintillation Neutrino Detector (LSND) at LAMPF will be presented as well as a recent analysis of an earlier experiment (E734) carried out at Brookhaven.« less