PT Journal
AU BABAR Collaboration (Lees, JPea
   Martinez-Vidal, F
   Oyanguren, A
TI Study of Upsilon(1S) radiative decays to gamma pi(+)pi(-) and gamma K+ K-
SO Physical Review D
JI Phys. Rev. D
PY 2018
BP 112006
EP 17pp
VL 97
IS 11
DI 10.1103/PhysRevD.97.112006
LA English
AB We study the Upsilon(1S) radiative decays to gamma pi(+)pi(-) and gamma K+K- using data recorded with the BABAR detector operating at the SLAC PEP-11 asymmetric-energy e(+)e(-) collider at center-of-mass energies at the Upsilon(2S) and Upsilon(3S) resonances. The Upsilon(1S) resonance is reconstructed from the decay Upsilon(nS) -> pi(+)pi(-) Upsilon(1S), n =2, 3. Branching fraction measurements and spin-parity analyses of Upsilon(1S) radiative decays are reported for the I = 0 S-wave and f(2) (1270) resonances in the pi(+)pi(-) mass spectrum, the f'(2) (1525) and f(0) (1500) in the K+K mass spectrum, and the f(0)(1710) in both.
ER