PT Journal
AU Wang, GY
   Roca, L
   Oset, E
TI Discerning the two K-1 (1270) poles in D-0 -> pi(+) VP decay
SO Physical Review D
JI Phys. Rev. D
PY 2019
BP 074018
EP 10pp
VL 100
IS 7
DI 10.1103/PhysRevD.100.074018
LA English
AB Within the chiral unitary approach, the axial-vector resonance K-1 (1270) has been predicted to manifest a two-pole nature. The lowest pole has a mass of 1195 MeV and a width of 246 MeV and couples mostly to K*pi, and the highest pole has a mass of 1284 MeV and a width of 146 MeV and couples mostly to rho K. We analyze theoretically how this double-pole structure can show up in D-0 -> pi+VP decays by looking at the vector-pseudoscalar (VP) invariant mass distribution for different VP channels, exploiting the fact that each pole couples differently to different VP pairs. We find that the final (K) over bar*pi and rho(K) over tilde channels are sensible to the different poles of the K-1 (1270) resonance and hence are suitable reactions to analyze experimentally the double-pole nature of this resonance.
ER