Lepton-Flavor-Dependent Angular Analysis of Bto K^ast ell^+ell^-

Belle Collaboration: S. Wehle , C. Niebuhr , S. Yashchenko , I. Adachi , H. Aihara , S. Al Said , D. M. Asner , V. Aulchenko

show 194 more authors

T. Aushev R. Ayad T. Aziz V. Babu A. M. Bakich V. Bansal E. Barberio W. Bartel P. Behera B. Bhuyan J. Biswal A. Bobrov A. Bondar G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho Y. Choi D. Cinabro N. Dash J. Dingfelder Z. Dr\'asal D. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard P. Goldenzweig B. Golob O. Grzymkowska E. Guido J. Haba T. Hara K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon Y. Jin D. Joffe K. K. Joo T. Julius A. B. Kaliyar K. H. Kang G. Karyan P. Katrenko T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim H. J. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim K. Kinoshita L. Koch P. Kody\v{s} S. Korpar D. Kotchetkov P. Kri\v{z}an P. Krokovny T. Kuhr R. Kulasiri T. Kumita A. Kuzmin Y.-J. Kwon J. S. Lange C. H. Li L. Li Y. Li L. Li Gioi J. Libby M. Lubej T. Luo M. Masuda T. Matsuda K. Miyabayashi H. Miyake R. Mizuk G. B. Mohanty T. Mori R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak N. K. Nisar S. Nishida S. Ogawa H. Ono Y. Onuki G. Pakhlova B. Pal C.-S. Park C. W. Park H. Park S. Paul L. Pes\'antez L. E. Piilonen C. Pulvermacher J. Rauch M. Ritter A. Rostomyan Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato V. Savinov T. Schl\"uter O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo O. Seon I. S. Seong M. E. Sevior C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon R. Sinha E. Solovieva M. Stari\v{c} J. F. Strube K. Sumisawa T. Sumiyoshi M. Takizawa U. Tamponi F. Tenchini T. Tsuboyama M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Ushiroda Y. Usov S. E. Vahsen C. Van Hulse G. Varner K. E. Varvell V. Vorobyev A. Vossen E. Waheed C. H. Wang M.-Z. Wang P. Wang M. Watanabe Y. Watanabe E. Widmann K. M. Williams E. Won H. Yamamoto Y. Yamashita H. Ye Y. Yook C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov M. Ziegler A. Zupanc

Authors on Pith no claims yet

classification ✦ hep-ex

keywords analysisangularasymmetric-energybellecollectedcolliderconsistentcontaining

0 comments

read the original abstract

We present a measurement of angular observables and a test of lepton flavor universality in the $B\to K^\ast \ell^+\ell^-$ decay, where $\ell$ is either $e$ or $\mu$. The analysis is performed on a data sample corresponding to an integrated luminosity of $711~\mathrm{fb}^{-1}$ containing $772\times 10^{6}$ $B\bar B$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the asymmetric-energy $e^+e^-$ collider KEKB. The result is consistent with Standard Model (SM) expectations, where the largest discrepancy from a SM prediction is observed in the muon modes with a local significance of $2.6\sigma$.

This paper has not been read by Pith yet.

discussion (0)

Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

First evidence of the decay $B^+\to\pi^+ e^+ e^-$
hep-ex 2026-04 unverdicted novelty 8.0

First evidence of B⁺→π⁺e⁺e⁻ decay at 3.2σ significance with branching fraction (2.4 +0.9-0.8 +0.4-0.2)×10^{-8} consistent with SM prediction.
First evidence of the decay $B^+\to\pi^+ e^+ e^-$
hep-ex 2026-04 conditional novelty 8.0

LHCb observes 3.2 sigma evidence for B+ -> pi+ e+ e- with measured branching fraction (2.4 +0.9 -0.8 +0.4 -0.2) x 10^-8, consistent with Standard Model.
Test of lepton flavour universality with $B^0\to K^{*0}\ell^+\ell^-$ decays at large dilepton invariant mass
hep-ex 2026-04 accept novelty 6.0

R_K*0 is measured as 1.08^{+0.14}_{-0.12}(stat) ± 0.07(syst) for q² > 14 GeV²/c⁴ in B⁰ → K*⁰ ℓ⁺ℓ⁻ decays, consistent with the Standard Model.
Flavour Physics beyond the LHC
hep-ex 2026-04 unverdicted novelty 2.0

The next two decades of flavour physics will be dominated by LHCb and Belle II data, with an e+e- collider potentially adding precision through Z, W+W-, and ttbar runs.