First simultaneous measurement of Ξ0 and Ξ ¯ 0 asymmetry parameters in ψ (3686) decay

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First simultaneous measurement of Ξ0 and Ξ ¯ 0 asymmetry parameters in ψ (3686) decay. / BESIII Collaboration ; Мучной, Николай Юрьевич.

In: Physical Review D, Vol. 108, No. 1, L011101, 07.07.2023.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{50b12a62146c4a10a044c28a48f120d0,

title = "First simultaneous measurement of Ξ0 and Ξ ¯ 0 asymmetry parameters in ψ (3686) decay",

abstract = "The Ξ0 asymmetry parameters are measured using entangled quantum Ξ0-Ξ¯0 pairs from a sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the Ξ0Ξ¯0 helicity states is measured to be Δφ=-0.050±0.150±0.020 rad, which implies that there is no obvious polarization at the current level of statistics. The decay parameters of the Ξ0 hyperon (αΞ0,αΞ¯0,φΞ0,φΞ¯0) and the angular distribution parameter [αψ(3686)] and Δφ are measured simultaneously for the first time. In addition, the CP asymmetry observables are determined to be ACPΞ0=(αΞ0+αΞ¯0)/(αΞ0-αΞ¯0)=-0.007±0.082±0.025 and ΔφCPΞ0=(φΞ0+φΞ¯0)/2=-0.079±0.082±0.010 rad, which are consistent with CP conservation.",

author = "{BESIII Collaboration} and Achasov, {M. N.} and C. Chen and Nikolaev, {I. B.} and Мучной, {Николай Юрьевич}",

year = "2023",

month = jul,

day = "7",

doi = "10.1103/PhysRevD.108.L011101",

language = "English",

volume = "108",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "1",

}

RIS

TY - JOUR

T1 - First simultaneous measurement of Ξ0 and Ξ ¯ 0 asymmetry parameters in ψ (3686) decay

AU - BESIII Collaboration

AU - Achasov, M. N.

AU - Chen, C.

AU - Nikolaev, I. B.

AU - Мучной, Николай Юрьевич

PY - 2023/7/7

Y1 - 2023/7/7

N2 - The Ξ0 asymmetry parameters are measured using entangled quantum Ξ0-Ξ¯0 pairs from a sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the Ξ0Ξ¯0 helicity states is measured to be Δφ=-0.050±0.150±0.020 rad, which implies that there is no obvious polarization at the current level of statistics. The decay parameters of the Ξ0 hyperon (αΞ0,αΞ¯0,φΞ0,φΞ¯0) and the angular distribution parameter [αψ(3686)] and Δφ are measured simultaneously for the first time. In addition, the CP asymmetry observables are determined to be ACPΞ0=(αΞ0+αΞ¯0)/(αΞ0-αΞ¯0)=-0.007±0.082±0.025 and ΔφCPΞ0=(φΞ0+φΞ¯0)/2=-0.079±0.082±0.010 rad, which are consistent with CP conservation.

AB - The Ξ0 asymmetry parameters are measured using entangled quantum Ξ0-Ξ¯0 pairs from a sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the Ξ0Ξ¯0 helicity states is measured to be Δφ=-0.050±0.150±0.020 rad, which implies that there is no obvious polarization at the current level of statistics. The decay parameters of the Ξ0 hyperon (αΞ0,αΞ¯0,φΞ0,φΞ¯0) and the angular distribution parameter [αψ(3686)] and Δφ are measured simultaneously for the first time. In addition, the CP asymmetry observables are determined to be ACPΞ0=(αΞ0+αΞ¯0)/(αΞ0-αΞ¯0)=-0.007±0.082±0.025 and ΔφCPΞ0=(φΞ0+φΞ¯0)/2=-0.079±0.082±0.010 rad, which are consistent with CP conservation.

UR - https://www.mendeley.com/catalogue/c6734455-1246-375d-b4db-0087148f8963/

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85166419607&origin=inward

U2 - 10.1103/PhysRevD.108.L011101

DO - 10.1103/PhysRevD.108.L011101

M3 - Article

VL - 108

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 1

M1 - L011101

ER -

ID: 68405525