Determination of the Proton's Weak Charge and Its Constraints on the Standard Model

Carlini, Roger D.; van Oers, Willem T.H.; Pitt, Mark L.; Smith, Gregory R.

doi:10.1146/annurev-nucl-101918-023633

Determination of the Proton's Weak Charge and Its Constraints on the Standard Model

Aug 6, 2019

27 pages

Published in:

Ann.Rev.Nucl.Part.Sci. 69 (2019) 191-217

Published: Aug 6, 2019

DOI:

10.1146/annurev-nucl-101918-023633

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Abstract: (Annual Reviews)

This article discusses some of the history of parity-violation experiments that culminated in the Qweak experiment, which provided the first determination of the proton's weak charge . The guiding principles necessary to the success of that experiment are outlined, followed by a brief description of the Qweak experiment. Several consistent methods used to determine from the asymmetry measured in the Qweak experiment are explained in detail. The weak mixing angle sin2θw determined from is compared with results from other experiments. A description of the procedure for using the result on the proton to set TeV-scale limits for new parity-violating semileptonic physics beyond the Standard Model (BSM) is presented. By also considering atomic parity-violation results on cesium, the article shows how this result can be generalized to set limits on BSM physics, which couples to any combination of valence quark flavors. Finally, the discovery space available to future weak-charge measurements is explored.

parity-violating electron scattering
asymmetry
weak charge of the proton
vector quark couplings
running of the weak mixing angle
physics beyond the Standard Model
p: charge
parity: violation
electron: scattering
quark: coupling

References(80)

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[1]

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC

ATLAS

Collaboration

•

Georges Aad
(
- Freiburg U.
)

et al.

- Phys.Lett.B 716 (2012) 1-29
•
e-Print:
- 1207.7214
•
DOI:
- 10.1016/j.physletb.2012.08.020

[2]

Observation of a New Boson at a Mass of 125 GeV with the CMS Experiment at the LHC

CMS

Collaboration

•

Serguei Chatrchyan
(
- Yerevan Phys. Inst.
)

et al.

- Phys.Lett.B 716 (2012) 30-61
•
e-Print:
- 1207.7235
•
DOI:
- 10.1016/j.physletb.2012.08.021

[3]

The Weak Neutral Current

Jens Erler
(
- UNAM, Mexico
)
,
Shufang Su
(
- Arizona U.
)

- Prog.Part.Nucl.Phys. 71 (2013) 119-149
•
e-Print:
- 1303.5522
•
DOI:
- 10.1016/j.ppnp.2013.03.004

[4]

Weak Polarized Electron Scattering

Jens Erler
(
- U. Mainz, PRISMA and
- Mainz U. and
- UNAM, Mexico
)
,
Charles J. Horowitz
(
- Indiana U.
)
,
Sonny Mantry
(
- Northwestern U. and
- Argonne
)
,
Paul A. Souder
(
- Syracuse U.
)

- Ann.Rev.Nucl.Part.Sci. 64 (2014) 269-298
•
e-Print:
- 1401.6199
•
DOI:
- 10.1146/annurev-nucl-102313-025520

[5]

A Test of Parity Conservation in p p Scattering

et al.

- Phys.Rev.Lett. 33 (1974) 1307,
- Phys.Rev.Lett. 33 (1974) 1594 (erratum)
•
DOI:
- 10.1103/PhysRevLett.33.1307

[6]

Further Measurements of Parity Nonconservation in Inelastic electron Scattering

et al.

- Phys.Lett.B 84 (1979) 524-528
•
DOI:
- 10.1016/0370-2693(79)91253-X

[7]

Precision measurement of the weak mixing angle in Moller scattering

SLAC E158

Collaboration

•

P.L. Anthony

et al.

- Phys.Rev.Lett. 95 (2005) 081601
•
e-Print:
- hep-ex/0504049
•
DOI:
- 10.1103/PhysRevLett.95.081601

[8]

Precision measurement of the weak charge of the proton

Qweak

Collaboration

•

D. Androić
(
- Zagreb U., Phys. Dept.
)

et al.

- Nature 557 (2018) 7704, 207-211
•
e-Print:
- 1905.08283
•
DOI:
- 10.1038/s41586-018-0096-0

[9]

The Q $_{weak}$ experimental apparatus

Qweak

Collaboration

•

T. Allison
(
- Jefferson Lab
)

et al.

- Nucl.Instrum.Meth.A 781 (2015) 105-133
•
e-Print:
- 1409.7100
•
DOI:
- 10.1016/j.nima.2015.01.023

[10]

Duvall WS. Precision measurement of the proton's weak charge using parity-violating electron scattering. PhD thesis, Va. Polytech. Inst. State Univ., Blacksburg

[11]

Myers KE. The first determination of the proton's weak charge through parity-violating asymmetry measurements in elastic e + p and e + Al scattering. PhD thesis, George Wash. Univ., Washington, DC

[12]

Magee JA. A measurement of the parity-violating asymmetry in aluminum and its contribution to a measurement of the proton's weak charge. PhD thesis, Coll. William Mary, Williamsburg, VA

[13]

Bartlett KD. First measurements of the parity-violating and beam-normal single-spin asymmetries in elastic electron-aluminum scattering. PhD thesis, Coll. William Mary, Williamsburg, VA

[14]

precision test of the standard model via parity-violating electron scattering in the Qweak experiment. PhD thesis, Univ. Va., Charlottesville