The anomalous <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi>Z</mml:mi><mml:mi>b</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi>b</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:math> couplings at the HERA and EIC

Yan, Bin; Yu, Zhite; Yuan, C. P.

doi:10.1016/j.physletb.2021.136697

Cited by 22 publications

(17 citation statements)

References 23 publications

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“…A more precise measurement was carried out at the Thomas Jefferson National Accelerator Facility (Jefferson Lab) [9,10], providing direct evidence of the non-zero C 2q couplings predicted by the electroweak theory. Recently, it was proposed to measure the single-spin asymmetry in PVDIS with b-tagged jets at HERA and EIC to probe the Zb b anomalous couplings [11,12]. In addition, PVDIS promises to play a vital role in exploring the partonic structure of the nucleon and nuclei.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Parity-violating Electron Scattering to a Dark Photon

Thomas,

Wang,

Williams

2022

Preprint

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We explore the sensitivity of the parity-violating electron scattering (PVES) asymmetry in both elastic and deep-inelastic scattering to the properties of a dark photon. Given advances in experimental capabilities in recent years, there are interesting regions of parameter space where PVES offers the chance to discover new physics in the near future. There are also cases where the existence of a dark photon could significantly alter our understanding of the structure of atomic nuclei and neutron stars as well as parton distribution functions.

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Section: Introductionmentioning

confidence: 99%

Sensitivity of Parity-violating Electron Scattering to a Dark Photon

Thomas,

Wang,

Williams

2022

Preprint

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“…It is also well know that the Zb b anomalous couplings are not fully determined by the electroweak precision measurements since the appearance of the degeneracy under the global analysis [4]. Recently, several approaches have been proposed in the literature to break the above mentioned degeneracy and to further test the Zb b couplings at the LHC and future colliders [8][9][10]. For example, the axial-vector component of the Zb b coupling can be determined by the precision measurement of the gg → Zh production at the LHC and high-luminosity LHC (HL-LHC), a proton-proton collider to operate at a centerof-mass energy of 14 TeV with an integrated luminosity of 3 ab −1 [8].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the axial-vector component of the Zb b coupling can be determined by the precision measurement of the gg → Zh production at the LHC and high-luminosity LHC (HL-LHC), a proton-proton collider to operate at a centerof-mass energy of 14 TeV with an integrated luminosity of 3 ab −1 [8]. It can also be better constrained by the average jet charge weighted single-spin asymmetry to be measured at the upcoming Electron-Ion Collider (EIC) [10], while the vector-component of the Zb b coupling can be determined by the measurement of the single-spin asymmetry, of the polarized electron-proton cross section in neutral current deeply inelastic scattering processes with one b-tagged jet in the final state, at the HERA and the EIC [9].…”

Section: Introductionmentioning

confidence: 99%

Probing the $Zb\bar{b}$ anomalous couplings via exclusive $Z$ boson decay

Dong,

Sun,

Yan

et al. 2022

Preprint

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We propose to utilize the exclusive Z-boson rare decays Z → Υ(ns) + γ to constrain the Zb b couplings at the HL-LHC and 100 TeV proton-proton collider. We demonstrate that the event yield of the proposed processes is sensitive to the axial-vector component of the Zb b coupling and can provide complementary information to the jet-charge weighted single-spin asymmetry measurement at the EIC and the gg → Zh production rate measurement at the LHC. By applying the NRQCD factorization formalism, we calculate the partial decay width of Z → Υ(ns)+γ to the NLO accuracy in strong interaction, which is found to agree with those obtained from the light-cone distribution amplitude approach. We show that the HL-LHC can break the degeneracy of the Zb b couplings, as implied by the precision electroweak data at LEP and SLC, if the signal efficiency can be improved by a factor of 1.7 from the present ATLAS analysis at the 13 TeV LHC with an integrated luminosity of 36.1 fb −1 .

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“…Breaking the above-mentioned degeneracy and as well as confirming or excluding the anomaly of A b FB measurement at LEP is one of the major tasks of the particle physics at the current and future colliders. Recently, we demonstrated that the axial-vector component of Zb b coupling can be determined by the precision measurement of gg → Zh production at the Large Hadron Collider (LHC) and the high-luminosity LHC (HL-LHC) [6], while its vector component can be better constrained by the measurement of single-spin asymmetry (SSA) in the polarized leptonhadron collisions, such as at HERA and the upcoming Electron-Ion Collider (EIC) [7].…”

Section: Introductionmentioning

confidence: 99%

“…It was concluded in [7] that the SSA at the EIC is only sensitive to the vector component of the Zb b coupling. To probe its axial-vector component at the EIC calls for a novel idea, that is to measure the average jet charge weighted single-spin asymmetry (WSSA) of the polarized electron-proton cross section in neutral current deeplyinelastic scattering (DIS) processes with one b-tagged jet in the final state.…”

Section: Introductionmentioning

confidence: 99%

Jet Charge: A new tool to probe the anomalous $Zb\bar{b}$ couplings at the EIC

Li,

Yan,

Yuan

2021

Preprint

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We propose to utilize the average jet charge weighted single-spin asymmetry A bQ e in the neutral current DIS scattering with one b-tagged jet produced at the EIC to probe the Zb b interactions. This novel observable is sensitive to the axial-vector component of the Zb b coupling and is complementary to the single-spin asymmetry measurement at the EIC and the gg → Zh cross section measurement at the HL-LHC in the determination of the Zb b couplings. We show that the apparent degeneracy of the Zb b couplings, implied by the LEP and SLC precision electroweak data, can be broken by the A bQ e measurement at the EIC. With a large enough integrated luminosity collected at the EIC, the measurement of A bQ e could also resolve the long-standing discrepancy of A b FB at the LEP, strongly dependent on the b-tagging efficiency.

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The anomalous Zbb¯ couplings at the HERA and EIC

Cited by 22 publications

References 23 publications

Sensitivity of Parity-violating Electron Scattering to a Dark Photon

Sensitivity of Parity-violating Electron Scattering to a Dark Photon

Probing the $Zb\bar{b}$ anomalous couplings via exclusive $Z$ boson decay

Jet Charge: A new tool to probe the anomalous $Zb\bar{b}$ couplings at the EIC

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