Study of 
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 violation in hyperon decays at super-charm-tau factories with a polarized electron beam

Salone, N.; Adlarson, P.; Batozskaya, V.; Kupść, A.; Leupold, Stefan; Tandean, Jusak

doi:10.1103/physrevd.105.116022

Cited by 23 publications

(14 citation statements)

References 92 publications

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“…The strong interaction of the b-π system is given by the δ P and δ S phases and the CP-odd phases are ξ P and ξ S . The amplitude ratios |P/S| for Λ → pπ − and Ξ − → Λπ − are 0.442(4) and 0.188(2), respectively [10]. Since only the angular distributions will be discussed the probability of the decay…”

Section: Baryon Two-body Weak Decaysmentioning

confidence: 99%

“…The two production reaction parameters, the decay parameters α Λ , α Ξ and β Ξ , as well as the CP-violating variables A Λ CP , A Ξ CP and B Ξ CP , can be determined using unbinned maximum likelihood fit to the measured angular distributions. The statistical uncertainty of the observable A Λ CP in the process e + e − → J/ψ → ΛΛ is inversely proportional to the Λ polarization [10]. The weak phase difference for the Ξ baryon decay is directly given by the measurement of the B Ξ CP observable in the process e + e − → J/ψ → ΞΞ.…”

Section: Spin Entangled Baryon-antibaryon Systemsmentioning

confidence: 99%

“…The weak phase difference for the Ξ baryon decay is directly given by the measurement of the B Ξ CP observable in the process e + e − → J/ψ → ΞΞ. The sensitivity of such measurement depends on the average squared of the Ξ polarization and the ΞΞ spin correlation terms [10]. [13,14].…”

Section: Spin Entangled Baryon-antibaryon Systemsmentioning

confidence: 99%

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Discrete symmetry tests using hyperon-antihyperon pairs

Kupść

2023

EPJ Web Conf.

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The BESIII experiment has accumulated millions of spin entangled hyperon–antihyperon pairs from the decays of the J/ψ and ψ(2S ) mesons produced in electron–positron collisions. Using multi-dimensional methods to analyze the angular distributions in the sequential decays the hyperon and antihyperon decay amplitudes are studied and tests of the combined charge-conjugation–parity (CP) symmetry are performed. Implications of the recent results using J/ψ decays into Λ$ \bar \Lambda $ and Ξ−$ \bar {\Xi}^{+} $ are presented. For the cascade decay chain, the exclusive measurement allows for three independent CP tests and the first direct determination of the weak phases.

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Section: Baryon Two-body Weak Decaysmentioning

confidence: 99%

Section: Spin Entangled Baryon-antibaryon Systemsmentioning

confidence: 99%

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Discrete symmetry tests using hyperon-antihyperon pairs

Kupść

2023

EPJ Web Conf.

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“…The advent of high-intensity facilities producing baryons and antibaryons in abundance, opens up a new possibility: the search for CP V in baryon decays [8][9][10][11]. This has been demonstrated in several measurements by the BESIII collaboration, where analyses of polarized and entangled pairs of single-strange Λ [12,13] and Σ + [14] baryons resulted in the most precise CP tests so far for baryons.…”

mentioning

confidence: 99%

“…According to Ref. [10], A Ξ CP is proportional to the product of the strong (δ P − δ S ) and weak (ξ P − ξ S ) phase differences of the final state interaction. Hence, for the case of a tiny strong phase difference, A Ξ CP would vanish even if the weak phase difference is non-zero.…”

mentioning

confidence: 99%

Study of the processes χcJ → Ξ−$$ \overline{\Xi} $$ + and Ξ0 $$ \overline{\Xi} $$0

Ablikim

Ачасов

Adlarson

et al. 2022

J. High Energ. Phys.

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Using 448.1 × 106ψ(3686) decays collected with the BESIII detector at the BEPCII e+e− storage rings, the branching fractions and angular distributions of the decays χcJ→ Ξ−$$ \overline{\Xi} $$ Ξ ¯ + and Ξ0$$ \overline{\Xi} $$ Ξ ¯ 0 (J = 0, 1, 2) are measured based on a partial-reconstruction technique. The decays χc1→ Ξ0$$ \overline{\Xi} $$ Ξ ¯ 0 and χc2→ Ξ0$$ \overline{\Xi} $$ Ξ ¯ 0 are observed for the first time with statistical significances of 7σ and 15σ, respectively. The results of this analysis are in good agreement with previous measurements and have significantly improved precision.

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STCF conceptual design report (Volume 1): Physics & detector

Achasov,

Ai,

et al. 2023

Front. Phys.

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The super τ-charm facility (STCF) is an electron–positron collider proposed by the Chinese particle physics community. It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5 × 1035 cm−2·s−1 or higher. The STCF will produce a data sample about a factor of 100 larger than that of the present τ-charm factory — the BEPCII, providing a unique platform for exploring the asymmetry of matter-antimatter (charge-parity violation), in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions, as well as searching for exotic hadrons and physics beyond the Standard Model. The STCF project in China is under development with an extensive R&D program. This document presents the physics opportunities at the STCF, describes conceptual designs of the STCF detector system, and discusses future plans for detector R&D and physics case studies.

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Study of CP violation in hyperon decays at super-charm-tau factories with a polarized electron beam

Cited by 23 publications

References 92 publications

Discrete symmetry tests using hyperon-antihyperon pairs

Discrete symmetry tests using hyperon-antihyperon pairs

Study of the processes χcJ → Ξ−$$ \overline{\Xi} $$ + and Ξ0 $$ \overline{\Xi} $$0

STCF conceptual design report (Volume 1): Physics & detector

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