# EPS-HEP2019

10-17 July 2019
Ghent
Europe/Brussels timezone

## Recent results on production and decay of quarkonium states at BABAR

12 Jul 2019, 15:15
15m
Campus Ledeganck - Aud. 6 (Ghent)

### Campus Ledeganck - Aud. 6

#### Ghent

Parallel talk QCD and Hadronic Physics

### Speakers

Guy Wormser (LAL Orsay) Guy Henri Maurice Wormser (Centre National de la Recherche Scientifique (FR)) Guy Wormser

### Description

We present measurements of absolute branching fractions of the two-body decays of $B$ mesons ${\cal{B}}(B \to K + X)$, where $X$ is a charmonium state, by using a data set corresponding to about 470 fb$^{-1}$ collected by the $BABAR$ detector at the PEP-II $e^+e^-$ collider. For events in which one $B$ is fully reconstructed, the charmonium spectrum can be observed in an unbiased way by looking at the distribution of the $K$ momentum in the rest frame of the recoiling $B$.
The same data set is used to study the radiative decays of the $\Upsilon(1S)$ to $\pi^+\pi^-\gamma$ and $K^+K^-\gamma$ final states, performed on the data samples collected at the peak of the $\Upsilon(2S)$ and $\Upsilon(3S)$ resonances. The $\Upsilon(1S)$ is reconstructed from the decay chains $\Upsilon(nS) \to \pi^+pi^- \Upsilon(1S)$, with $n=2,3$.
Branching fractions measurements and spin-parity analysis are reported for the $\Upsilon(1S)$ radiative decays to intermediate resonances observed in the $\pi^+\pi^-$ and $K^+K^-$ mass spectra.

### Primary authors

Fabio Anulli (Sapienza Universita e INFN, Roma I (IT)) Guy Wormser (LAL Orsay)