Test of Light-Lepton Universality in the Rates of Inclusive Semileptonic B-Meson Decays at Belle II

被引：9

作者：

Aggarwal, L.

Ahmed, H.

Aihara, H.

Akopov, N.

Aloisio, A.

Ky, N. Anh

Asner, D. M.

Atmacan, H.

Aushev, T.

Aushev, V.

Bae, H.

Bahinipati, S.

Bambade, P.

Banerjee, Sw.

Bansal, S.

Barrett, M.

Baudot, J.

Bauer, M.

Baur, A.

Beaubien, A.

Becker, J.

Bennett, J. V.

Bernieri, E.

Bernlochner, F. U.

Bertacchi, V.

Bertemes, M.

Bertholet, E.

Bessner, M.

Bettarini, S.

Bhardwaj, V.

Bhuyan, B.

Bianchi, F.

Bilka, T.

Bilokin, S.

Biswas, D.

Bodrov, D.

Borah, J.

Bozek, A.

Bracko, M.

Briere, R. A.

Browder, T. E.

Budano, A.

Bussino, S.

Campajola, M.

Cao, L.

Casarosa, G.

Cecchi, C.

Cerasoli, J.

Chang, M. -C.

Cheaib, R.

机构：

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 131卷 / 05期

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

MONTE-CARLO; PHYSICS; HEAVY;

D O I：

10.1103/PhysRevLett.131.051804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the first measurement of the ratio of branching fractions of inclusive semileptonic B-meson decays, R(X-e/mu) = B(B -> Xe nu)/B(B -> X mu nu), a precision test of electron-muon universality, using data corresponding to 189 fb(-1) from electron-positron collisions collected with the Belle II detector. In events where the partner B meson is fully reconstructed, we use fits to the lepton momentum spectra above 1.3 GeV/c to obtain R(X-e/mu) = 1.007 +/- 0.009(stat) +/- 0.019(syst), which is the most precise lepton-universality test of its kind and agrees with the standard-model expectation.

引用

页数：7

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