The Qweak experimental apparatus

Allison, Trent; Anderson, Mitchell D.; Androić, D.; Armstrong, David; Asaturyan, A.; Averett, T.; Averill, R.; Balewski, J.; Beaufait, J.; Beminiwattha, R.; Benesch, J.; Benmokhtar, F.; Bessuille, J.; Bírchall, J.; Bonnell, Elizabeth; Bowman, J. D.; Brindza, P.; Brown, Dustin; Carlini, R.; Cates, G. D.; Cavness, B.; Clark, G.; Cornejo, J. C.; Dusa, S. Covrig; Dalton, M. M.; Davis, C. A.; Dean, D.C.; Deconinck, W.; Diefenbach, J.; Dow, K.; Dowd, J. F.; Dunne, J.; Dutta, D.; Duvall, W. S.; Echols, J. R.; Elaasar, M.; Falk, W.R.; Finelli, K. D.; Finn, J. M.; Gaskell, D.; Gericke, Michael; Grames, Joseph; Gray, V. M.; Grimm, K.; Guo, Fang; Hansknecht, J.; Harrison, David; Henderson, Elizabeth; Hoskins, J. R.; Ihloff, E.; Johnston, K.; Jones, D.; Jones, M.; Jones, R. T.; Kargiantoulakis, M.; Kelsey, J.; Khan, N.; P, King; Korkmaz, E.; Kowalski, S.; Kubera, A. M.; Leacock, J.; Leckey, J.; Lee, A.R.; Lee, J.H.; Lee, L.; Liang, Y.; MacEwan, S.; Mack, D.; Magee, J. A.; Mahurin, R.; Mammei, J.; Martin, J. W.; McCreary, Amber; Mcdonald, Millie; McHugh, M. J.; Medeiros, P.; Meekins, D.; Mei, J.; Michaels, R.; Micherdzińska, A.; Mkrtchyan, A.; Mkrtchyan, H.; Morgan, N.; Musson, John; Mesick, K. E.; Narayan, A.; Ndukum, L. Z.; Nelyubin, V.; Nuruzzaman, Md.; Oers, W. T. H. van; Opper, A. K.; Page, S. A.; Pan, Jie; Paschke, K.; Phillips, S. K.; Pitt, M. L.; Poelker, M.; Rajotte, Jean-François; Ramsay, W. D.; Roberts, W.R.; Roche, J.; Rose, P.; Sawatzky, B.; Ševa, T.; Shabestari, M.; Silwal, R.; Šimičević, N.; Smith, G. R.; Sobczynski, S.; Solvignon, P.; Spayde, D. T.; Stokes, B. T.; Storey, D.; Subedi, A.; Subedi, R.; Suleiman, R.; Tadevosyan, V.; Tobias, W. A.; Tvaskis, V.; Urban, Erik; Waidyawansa, B.; Wang, P.; Wells, S. P.; Wood, S. A.; Yang, Shin Nan; Zhamkochyan, S.; Zielinski, R.

doi:10.1016/j.nima.2015.01.023

Cited by 47 publications

(77 citation statements)

References 42 publications

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“…[56], but target heating may preclude its use under DarkLight conditions. To consider this issue further we turn to the Qweak experiment at JLab [57], which uses a liquid hydrogen target and an electron beam with energy E = 1. 16 GeV and a beam current of 180 µA, yielding a beam power in this latter case of 0.209 MW.…”

Section: Numerical Estimates and Experimental Prospectsmentioning

confidence: 99%

Phenomenology of neutron-antineutron conversion

Gardner¹,

Yan²

2018

Phys. Rev. D

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We consider the possibility of neutron-antineutron (n −n) conversion, in which the change of a neutron into an antineutron is mediated by an external source, as can occur in a scattering process. We develop the connections between n −n conversion and n −n oscillation, in which a neutron spontaneously transforms into an antineutron, noting that if n −n oscillation occurs in a theory with baryon number minus lepton number (B-L) violation, then n −n conversion can occur also. We show how an experimental limit on n −n conversion could connect concretely to a limit on n −n oscillation, and vice versa, using effective field theory techniques and baryon matrix elements computed in the MIT bag model.

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Section: Numerical Estimates and Experimental Prospectsmentioning

confidence: 99%

Phenomenology of neutron-antineutron conversion

Gardner¹,

Yan²

2018

Phys. Rev. D

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“…1, and details can be found in Ref. [2,5]. The CW electron beam was deflected vertically by two dipole magnets to where it could interact with the photon target.…”

Section: The Hall C Compton Polarimetermentioning

confidence: 99%

“…High-precision physics experiments using polarized electron beams rely on accurate knowledge of beam polarization to achieve their ever improving precision. A parity-violating electron-scattering experiment in Hall C at Jefferson Lab (JLab), known as the Q weak experiment, is the most recent example [1,2]. The Q weak experiment aims to test the Standard Model of particle physics by providing a first precision measurement of the weak vector charge of the proton, from which the weak mixing angle will be extracted with the highest precision away from the Z 0 pole.…”

Section: Introductionmentioning

confidence: 99%

“…In order to meet the high-precision requirement of the Q weak experiment, a new polarimeter based on electronphoton scattering (Compton scattering) was constructed in experimental Hall C [2,5]. This polarimeter could be operated without disrupting the electron beam, allowing for continuous polarization measurement during the Q weak experiment.…”

Section: Introductionmentioning

confidence: 99%

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Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors

Narayan¹,

Jones²,

Cornejo³

et al. 2016

Phys. Rev. X

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We report on the highest precision yet achieved in the measurement of the polarization of a lowenergy, O(1 GeV), continuous wave (CW) electron beam, accomplished using a new polarimeter based on electron-photon scattering, in Hall C at Jefferson Lab. A number of technical innovations were necessary, including a novel method for precise control of the laser polarization in a cavity and a novel diamond microstrip detector which was able to capture most of the spectrum of scattered electrons. The data analysis technique exploited track finding, the high granularity of the detector and its large acceptance. The polarization of the 180 µA, 1.16 GeV electron beam was measured with a statistical precision of < 1% per hour and a systematic uncertainty of 0.59%. This exceeds the level of precision required by the Q weak experiment, a measurement of the weak vector charge of the proton. Proposed future low-energy experiments require polarization uncertainty < 0.4%, and this result represents an important demonstration of that possibility. This measurement is the first use of diamond detectors for particle tracking in an experiment. It demonstrates the stable operation of a diamond based tracking detector in a high radiation environment, for two years.

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“…The success of the strange-form-factor program led to the publication of some even more challenging experiments providing improved SM tests, SLAC E158 [27] and Qweak [28] at JLab and also the JLab PREx experiment [29], which measured PVES on 208 Pb to determine the charge radius of the neutron distribution. These, along with the future PREx-II and CREx measurements, are the Generation III PVES experiments.…”

Section: History Of the Fieldmentioning

confidence: 99%

Parity violation in electron scattering

Souder

Paschke

2015

Front. Phys.

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By comparing the cross sections for left-and right-handed electrons scattered from various unpolarized nuclear targets, the small parity-violating asymmetry can be measured. These asymmetry data probe a wide variety of important topics, including searches for new fundamental interactions and important features of nuclear structure that cannot be studied with other probes. A special feature of these experiments is that the results are interpreted with remarkably few theoretical uncertainties, which justifies pushing the experiments to the highest possible precision. To measure the small asymmetries accurately, a number of novel experimental techniques have been developed.

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The Qweak experimental apparatus

Cited by 47 publications

References 42 publications

Phenomenology of neutron-antineutron conversion

Phenomenology of neutron-antineutron conversion

Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors

Parity violation in electron scattering

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