TY  - JOUR
AU  - BABAR Collaboration (Lees, J. P. et al
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Villanueva-Perez, P.
PY  - 2014
DA  - 2014//
TI  - Bottomonium spectroscopy and radiative transitions involving the chi(bJ)(1P, 2P) states at BABAR
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 112010
EP  - 20pp
VL  - 90
IS  - 11
PB  - Amer Physical Soc
AB  - We use (121 +/- 1) million Upsilon(3S) and (98 +/- 1) million Upsilon(2S) mesons recorded by the BABAR detector at the PEP-II e(+)e(-) collider at SLAC to perform a study of radiative transitions involving the chi(bJ)(1P, 2P) states in exclusive decays with mu(+)mu(-)gamma gamma final states. We reconstruct twelve channels in four cascades using two complementary methods. In the first we identify both signal photon candidates in the electromagnetic calorimeter (EMC), employ a calorimeter timing-based technique to reduce backgrounds, and determine branching-ratio products and fine mass splittings. These results include the best observational significance yet for the chi(b0)(2P) -> gamma Upsilon(2S) and chi(b0)(1P) -> gamma Upsilon(1S) transitions. In the second method, we identify one photon candidate in the EMC and one which has converted into an e(+)e(-) pair due to interaction with detector material, and we measure absolute product branching fractions. This method is particularly useful for measuring Upsilon(3S) -> gamma chi(b1,2)(1P) decays. Additionally, we provide the most up-to-date derived branching fractions, matrix elements and mass splittings for chi(b) transitions in the bottomonium system. Using a new technique, we also measure the two lowest-order spin-dependent coefficients in the nonrelativistic QCD Hamiltonian.
SN  - 1550-7998
UR  - http://arxiv.org/abs/1410.3902
UR  - https://doi.org/10.1103/PhysRevD.90.112010
DO  - 10.1103/PhysRevD.90.112010
LA  - English
N1  - WOS:000348871500002
ID  - BABARCollaborationLees_etal2014
ER  -