TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Ruiz Valls, P.
AU  - Sanchez Mayordomo, C.
PY  - 2014
DA  - 2014//
TI  - Measurement of the resonant and CP components in (B)over-bar(0) -> J/psi pi(+)pi(-) decays
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 012003
EP  - 21pp
VL  - 90
IS  - 1
PB  - Amer Physical Soc
AB  - The resonant structure of the reaction (B) over bar (0) --> J/psi pi(+)pi(-) is studied using data from 3 fb(-1) of integrated luminosity collected by the LHCb experiment, one third at 7 TeV center-of-mass energy and the remainder at 8 TeV. The invariant mass of the pi(+)pi(-) pair and three decay angular distributions are used to determine the fractions of the resonant and nonresonant components. Six interfering pi(+)pi(-) states, rho(770), f(0)(500), f(2)(1270), rho(1450), omega(782) and rho(1700), are required to give a good description of invariant mass spectra and decay angular distributions. The positive and negative charge parity fractions of each of the resonant final states are determined. The f(0)(980) meson is not seen and the upper limit on its presence, compared with the observed f(0)(500) rate, is inconsistent with a model where these scalar mesons are formed from two quarks and two antiquarks (tetraquarks) at the eight standard deviation level. In the q (q) over bar model, the absolute value of the mixing angle between the f(0)(980) and the f(0)(500) scalar mesons is limited to be less than 17 degrees at 90% confidence level.
SN  - 1550-7998
UR  - http://arxiv.org/abs/arXiv:1404.5673
UR  - https://doi.org/10.1103/PhysRevD.90.012003
DO  - 10.1103/PhysRevD.90.012003
LA  - English
N1  - WOS:000339169600001
ID  - LHCbCollaborationAaij_etal2014
ER  -