First direct measurement of the absolute branching fraction of Σ+→Λe+νe

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First direct measurement of the absolute branching fraction of Σ+→Λe+νe. / BESIII Collaboration ; Мучной, Николай Юрьевич ; Николаев, Иван Борисович.

In: Physical Review D, Vol. 107, No. 7, 072010, 28.04.2023.

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

BibTeX

@article{42e26963968f4195a33cd651eb70883e,

title = "First direct measurement of the absolute branching fraction of Σ+→Λe+νe",

abstract = "The first direct measurement of the absolute branching fraction of is reported based on an 푒+⁢푒− annihilation sample of (10087±44)×106 퐽/휓 events collected with the BESIII detector at √푠 =3.097 GeV. The branching fraction is determined to be ℬ⁡(Σ+ →Λ⁢푒+⁢휈푒) =[2.93 ± 0.74⁢(stat) ±0.13⁢(syst)] ×10−5, which is the most precise measurement obtained in a single experiment to date and also the first result obtained at a collider experiment. Combining this result with the world average of ℬ⁡(Σ− →Λ⁢푒−⁢¯휈푒) and the lifetimes of Σ±, the ratio, Γ⁡(Σ−→Λ⁢푒−⁢¯휈푒)Γ⁡(Σ+→Λ⁢푒+⁢휈푒) , is determined to be 1.06 ±0.28, which is within 1.8 standard deviations of the value expected in the absence of second-class currents.",

author = "{BESIII Collaboration} and M. Ablikim and M. n. Achasov and Мучной, {Николай Юрьевич} and Николаев, {Иван Борисович}",

note = "First direct measurement of the absolute branching fraction of Σ+→Λe+νe / BESIII Collaboration // Physical Review D. – 2023. – Vol. 107, No. 7. – P. 072010. – DOI 10.1103/physrevd.107.072010.",

year = "2023",

month = apr,

day = "28",

doi = "10.1103/PhysRevD.107.072010",

language = "English",

volume = "107",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "7",

}

RIS

TY - JOUR

T1 - First direct measurement of the absolute branching fraction of Σ+→Λe+νe

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - First direct measurement of the absolute branching fraction of Σ+→Λe+νe / BESIII Collaboration // Physical Review D. – 2023. – Vol. 107, No. 7. – P. 072010. – DOI 10.1103/physrevd.107.072010.

PY - 2023/4/28

Y1 - 2023/4/28

N2 - The first direct measurement of the absolute branching fraction of is reported based on an 푒+⁢푒− annihilation sample of (10087±44)×106 퐽/휓 events collected with the BESIII detector at √푠 =3.097 GeV. The branching fraction is determined to be ℬ⁡(Σ+ →Λ⁢푒+⁢휈푒) =[2.93 ± 0.74⁢(stat) ±0.13⁢(syst)] ×10−5, which is the most precise measurement obtained in a single experiment to date and also the first result obtained at a collider experiment. Combining this result with the world average of ℬ⁡(Σ− →Λ⁢푒−⁢¯휈푒) and the lifetimes of Σ±, the ratio, Γ⁡(Σ−→Λ⁢푒−⁢¯휈푒)Γ⁡(Σ+→Λ⁢푒+⁢휈푒) , is determined to be 1.06 ±0.28, which is within 1.8 standard deviations of the value expected in the absence of second-class currents.

AB - The first direct measurement of the absolute branching fraction of is reported based on an 푒+⁢푒− annihilation sample of (10087±44)×106 퐽/휓 events collected with the BESIII detector at √푠 =3.097 GeV. The branching fraction is determined to be ℬ⁡(Σ+ →Λ⁢푒+⁢휈푒) =[2.93 ± 0.74⁢(stat) ±0.13⁢(syst)] ×10−5, which is the most precise measurement obtained in a single experiment to date and also the first result obtained at a collider experiment. Combining this result with the world average of ℬ⁡(Σ− →Λ⁢푒−⁢¯휈푒) and the lifetimes of Σ±, the ratio, Γ⁡(Σ−→Λ⁢푒−⁢¯휈푒)Γ⁡(Σ+→Λ⁢푒+⁢휈푒) , is determined to be 1.06 ±0.28, which is within 1.8 standard deviations of the value expected in the absence of second-class currents.

UR - https://www.elibrary.ru/item.asp?id=61363761

U2 - 10.1103/PhysRevD.107.072010

DO - 10.1103/PhysRevD.107.072010

M3 - Article

VL - 107

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 7

M1 - 072010

ER -

ID: 68342151