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Confronting Top AFB with Parity Violation Constraints
High Energy Physics - Phenomenology · Submitted 6 Mar 2012
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim As a result, atomic parity violation constraints disfavor at >3 sigma t-channel models that give rise to a greater than 20% AFB at the parton level for M_tt > 450 GeV while not producing too large a top cross-section.
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The abstract, sentence by sentence
We consider the implications of low-energy precision tests of parity violation on t-channel mediator models explaining the top AFB excess measured by CDF and D0. Flavor-violating u-t or d-t couplings of new scalar or vector mediators generate at one-loop an anomalous contribution to the nuclear weak charge. As a result, atomic parity violation constraints disfavor at >3 sigma t-channel models that give rise to a greater than 20% AFB at the parton level for M_tt > 450 GeV while not producing too large a top cross-section. Even stronger constraints are expected through future measurements of the proton weak charge by the Q-Weak experiment.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We consider the implications of low-energy precision tests of parity violation on t-channel mediator models explaining the top AFB excess measured by CDF and D0. | contribution 0.83 | 0.55 | 0.06 | unclear 0.62 |
| s1 | Flavor-violating u-t or d-t couplings of new scalar or vector mediators generate at one-loop an anomalous contribution to the nuclear weak charge. | method 0.31 | 0.28 | 0.04 | asserted 1.00 |
| s2 | As a result, atomic parity violation constraints disfavor at >3 sigma t-channel models that give rise to a greater than 20% AFB at the parton level for M_tt > 450 GeV while not producing too large a top cross-section. | result 0.98 | 0.73 | 0.88 | asserted 0.99 |
| s3 | Even stronger constraints are expected through future measurements of the proton weak charge by the Q-Weak experiment. | future work 0.64 | 0.15 | 0.06 | hedged possibility 0.80 |
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The paper
Original abstract
We consider the implications of low-energy precision tests of parity violation on t-channel mediator models explaining the top AFB excess measured by CDF and D0. Flavor-violating u-t or d-t couplings of new scalar or vector mediators generate at one-loop an anomalous contribution to the nuclear weak charge. As a result, atomic parity violation constraints disfavor at >3 sigma t-channel models that give rise to a greater than 20% AFB at the parton level for M_tt > 450 GeV while not producing too large a top cross-section. Even stronger constraints are expected through future measurements of the proton weak charge by the Q-Weak experiment.
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References
How the literature uses it
21 arXiv papers cite this in 37 sentences
Papers citing it · 32 sentences without a confident label
Uses its method or tool 2 papers
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Matching onto the nuclear weak charge [ref] [equation] where $Z$ is the proton number and $N$ is the neutron number, we find [equation] We do not match $V_2$ due to an additional $d_R$-quark coupling [ref] .
Flavor & new physics opportunities with rare charm decays into leptons · Leptoquark Constraints · 0.89
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To this end, we rewrite the operator $Q_2^1111$, using Fierz relations [ref] , as [equation] The effective Lagrangian leading to atomic parity violation can be written as [ref] [equation] The precise measurement of atomic parity violation in cesium ($^133$Cs) atoms together with the precision prediction of the corresponding Standard Model contributions constrains new physics contributions to $C_1u$ to the $10^-3$ level.
The Coannihilation Codex · Flavor physics in the leptoquark case study · 0.96
Cites it as support 1 paper
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Several models explaining the top quark forward-backward asymmetry with light $t$-channel mediators connecting $u$ and $t$ quarks are strongly disfavoured by APV constraints [ref] .
Tracking Down the Top Quark Forward-Backward Asymmetry with Monotops · Atomic parity violation · 0.97
Cites it as background 2 papers
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[ref] for a recent review and also [ref] ).
Discerning New Physics in Top-Antitop Production using Top Spin Observables at Hadron Colliders · Observables & Methodology · 0.99
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A number of new models have been proposed to account for the discrepancy in $A_FB^t$ [ref] .
Top A_FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets · Introduction · 0.92
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