Study of $\Upsilon(1S)$ Radiative Decays to $\gamma \pi^+ \pi^-$ and   $\gamma K^+ K^-$

J.P. Lees (The BaBar Collaboration)

arXiv:1804.04044·hep-ex·July 13, 2018

Study of $\Upsilon(1S)$ Radiative Decays to $\gamma \pi^+ \pi^-$ and $\gamma K^+ K^-$

J.P. Lees (The BaBar Collaboration)

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TL;DR

This paper investigates the radiative decay processes of the $5$ resonance into specific meson pairs, providing measurements of branching fractions and analyzing the spin-parity of various resonances using data from the BaBar detector.

Contribution

It presents new measurements of branching fractions and spin-parity analyses for $5$ radiative decays into $ ext{ }$ and $ ext{ }K^+K^-$, utilizing data from the BaBar experiment.

Findings

01

Branching fractions for $5$ radiative decays are measured.

02

Spin-parity analyses of resonances like $f_2(1270)$ and $f_0(1500)$ are performed.

03

Observation of the $f_0(1710)$ in both decay channels.

Abstract

We study the $Υ (1 S)$ radiative decays to $γ π^{+} π^{-}$ and $γ K^{+} K^{-}$ using data recorded with the BaBar detector operating at the SLAC PEP-II asymmetric-energy $e^{+} e^{-}$ collider at center-of-mass energies at the $Υ (2 S)$ and $Υ (3 S)$ resonances. The $Υ (1 S)$ resonance is reconstructed from the decay $Υ (n S) \to π^{+} π^{-} Υ (1 S)$ , $n = 2, 3$ . Branching fraction measurements and spin-parity analyses of $Υ (1 S)$ radiative decays are reported for the I=0 $S$ -wave and $f_{2} (1270)$ resonances in the $π^{+} π^{-}$ mass spectrum, the $f_{2}^{'} (1525)$ and $f_{0} (1500)$ in the $K^{+} K^{-}$ mass spectrum, and the $f_{0} (1710)$ in both.

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