Header

UZH-Logo

Maintenance Infos

QED in $\bar{B}$→ $\bar{K}\ell^+\ell^-$ LFU ratios: theory versus experiment, a Monte Carlo study


Isidori, Gino; Lancierini, Davide; Nabeebaccus, Saad; Zwicky, Roman (2022). QED in $\bar{B}$→ $\bar{K}\ell^+\ell^-$ LFU ratios: theory versus experiment, a Monte Carlo study. Journal of High Energy Physics, 2022(10):146.

Abstract

Using analytic results obtained in a meson effective theory, that includes all infrared sensitive logs, we build a dedicated Monte Carlo framework to describe QED corrections in $\bar{B}$ → $\bar{K}\ell^+\ell^-$ for a generic form factor. For the neutral mode $\bar{B}^0$ → $\bar{K}^0\ell^+\ell^−$, we perform a detailed numerical comparison versus those obtained with the general-purpose photon-shower tool PHOTOS. The comparison indicates a good agreement, at the few per-mil level, when focusing on the rare mode only. In addition, our framework allows us to investigate the impact of the charmonium resonances. Interference effects, not described by PHOTOS in the experimental analysis, are found to be small in the dilepton invariant mass region q$^2$ < 6GeV$^2$, which is used to determine RK$^{(∗)}$. Using a semi-analytic framework we assess the full, rare and resonant, mode. Based thereupon, we discuss strategies to check the subtraction of the resonant mode, which has a sizeable impact at q$^2$ ≈ 6GeV$^2$ in the electron mode.

Abstract

Using analytic results obtained in a meson effective theory, that includes all infrared sensitive logs, we build a dedicated Monte Carlo framework to describe QED corrections in $\bar{B}$ → $\bar{K}\ell^+\ell^-$ for a generic form factor. For the neutral mode $\bar{B}^0$ → $\bar{K}^0\ell^+\ell^−$, we perform a detailed numerical comparison versus those obtained with the general-purpose photon-shower tool PHOTOS. The comparison indicates a good agreement, at the few per-mil level, when focusing on the rare mode only. In addition, our framework allows us to investigate the impact of the charmonium resonances. Interference effects, not described by PHOTOS in the experimental analysis, are found to be small in the dilepton invariant mass region q$^2$ < 6GeV$^2$, which is used to determine RK$^{(∗)}$. Using a semi-analytic framework we assess the full, rare and resonant, mode. Based thereupon, we discuss strategies to check the subtraction of the resonant mode, which has a sizeable impact at q$^2$ ≈ 6GeV$^2$ in the electron mode.

Statistics

Citations

Dimensions.ai Metrics
21 citations in Web of Science®
21 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

7 downloads since deposited on 14 Feb 2023
4 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Uncontrolled Keywords:Nuclear and High Energy Physics
Language:English
Date:20 October 2022
Deposited On:14 Feb 2023 12:10
Last Modified:28 Jun 2024 01:42
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/jhep10(2022)146
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)