Measurement of the weak mixing angle at a Super Charm-Tau factory with data-driven monitoring of the average electron beam polarization

Bondar, A.; Grabovsky, Andrey; Резниченко, А. В.; Rudenko, A. S.; Vorobyev, V.

doi:10.1007/jhep03(2020)076

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…The initial findings for e + e − → J/ψ → ΛΛ have already been reported at the SCTF workshop [39] and independently in Ref. [40]. Here we give a detailed explanation of this result and extend it to sequential hyperon weak decays.…”

Section: A [ξ−]supporting

confidence: 72%

“…where ξ B := (Ω B , Ω b ) and P B is given by Eq. (40). As reference for comparing the ST uncertainties to the DT measurements with N reconstructed events, we will use a set of two independent ST experiments where the baryon and antibaryon decays are analysed with N reconstructed events each.…”

Section: B Joint Angular Distributionsmentioning

confidence: 99%

“…where P B is given by Eq. (40). The integral can be calculated exactly, and the result is expressed as…”

Section: Appendix A: Isospin Decompositionmentioning

confidence: 99%

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Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam

Salone,

Adlarson,

Batozskaya

et al. 2022

Preprint

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Non-leptonic two-body weak decays of baryons are an important tool to probe the combined charge-conjugation-parity symmetry (CP) violation. We explain why the decays of strange baryons provide complementary information to the decays of kaons. A model-independent parameterization of the non-leptonic decays of the Λ-and Ξ-baryons is reviewed, and the amplitudes are updated according to the latest experimental input. We demonstrate the potential of performing precision tests in strange baryon decays at the next generation electron-positron J/ψ factories with luminosity of 10 35 cm −2 s −1 . The copious production of spin-entangled hyperon-antihyperon pairs via the J/ψ resonance allows for a direct comparison of the baryon and antibaryon decay properties. Using analytic approximations and numerical calculations, we study the quantitative impact of spin correlations and polarization in such CP tests. We show that by using a longitudinally-polarized electron beam, the statistical precision of the CP tests can be significantly improved compared to the experiments without polarized beams. Furthermore, we map out further directions for possible improvements, like analysis of incompletely reconstructed events or a combination of the isospin related processes. Altogether, these methods are promising for the observation of a statistically significant CP-violation signal with a strength corresponding to the standard model predictions.Our conclusions should encourage more detailed feasibility studies, including optimisation of the measurement methods and studies of systematic effects. Finally, our results call for an update of the theory predictions with increased precision.

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Section: A [ξ−]supporting

confidence: 72%

Section: B Joint Angular Distributionsmentioning

confidence: 99%

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Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam

Salone,

Adlarson,

Batozskaya

et al. 2022

Preprint

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“…The normalization factor, denoted as , estimates the N MC −lnL events generated with the phase space model, which is approximately ten times the size of mDIY MC. Usually, the minimization of is performed using MINUIT [30]:…”

Section: Angular Distribution Fittingmentioning

confidence: 99%

Prospects of CP violation in Λ decay with a polarized electron beam at the STCF*

Zeng

Zhou³

et al. 2023

Chinese Phys. C

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Based on $1.89 \times 10^8$ $J/\psi \rightarrow \Lambda \bar{\Lambda}$ Monte Carlo (MC) events produced from a longitudinally-polarized electron beam, the sensitivity of $CP$ violation of $\Lambda$ decay is studied with fast simulation software. In addition, the $J/\psi \rightarrow \Lambda \bar{\Lambda}$ decay can also be used as a process to optimize the detector response using the interface provided by the fast simulation software.In the future, STCF is expected to obtain 3.4 trillion $J/\psi$ events, and the statistical sensitivity of $CP$ violation of $\Lambda$ decay via $J/\psi \rightarrow \Lambda \bar{\Lambda}$ process is expected to reach $\mathcal O$~$(10^{-5})$ when the electron beam polarization is 80\%. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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“…For instance, the sensitivity to search for τ → µγ process (LFV in τ-decay) at the SCT factory will be 10 times better than at the Belle-II due to better kinematics of the τ near the threshold of production and due to good µ/π-separation in a dedicated PID system [3,4]. The longitudinal polarization of the electron beam to better than 50% will help to perform more accurate measurements of the τ-lepton Michel parameters than expected at the Super-B factory [5] and Weinberg angle measurement at the energy of the J/ψ-meson [6]. Other feasibility studies for various physics cases are now under consideration [7].…”

Section: Introductionmentioning

confidence: 99%

Overview of PID options for experiments at the Super Charm-Tau Factory

Barnyakov

Belozyorova

et al. 2020

J. Inst.

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A: The Super Charm-Tau Factory is an electron-positron collider project in Novosibirsk with a peak luminosity of 10 35 cm −1 s −1 operating in the center of mass energy range between 2 and 6 GeV. The physics program of the experiment in general is devoted to the study of charm quark and tau lepton. Conceptual designs of the collider and a universal detector are presented. The dedicated particle identification (PID) system is required to provide the state-of-the-art level of µ/π separation for the particle momenta up to 1.2 GeV/c. The following options for the PID system are considered in this paper: Focusing Aerogel RICH (FARICH) detector composed of 4-layer aerogel tiles, threshold Cherenkov counters based on aerogel and shifter (ASHIPH), Focusing DIRC (FDIRC) counter and time-of-flight (ToF) detector combined with the time-of-propagation (ToP) approach providing a time resolution better than 30 ps. Also the capabilities of particles separation in tracking system are discussed. Comparison of PID approaches with help of parametric simulation is performed.

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Measurement of the weak mixing angle at a Super Charm-Tau factory with data-driven monitoring of the average electron beam polarization

Cited by 10 publications

References 13 publications

Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam

Study of CP violation in hyperon decays at Super Charm-Tau Factories with a polarized electron beam

Prospects of CP violation in Λ decay with a polarized electron beam at the STCF*

Overview of PID options for experiments at the Super Charm-Tau Factory

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