Experimental constraints on the spin and parity of the Z(4430)+
Belle Collaboration: K. Chilikin, R. Mizuk, I. Adachi, H. Aihara, K., Arinstein, D. M. Asner, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, A., Bala, V. Bhardwaj, B. Bhuyan, A. Bondar, G. Bonvicini, A. Bozek, M., Bra\v{c}ko, J. Brodzicka, T. E. Browder, V. Chekelian, A. Chen
TL;DR
This study uses a comprehensive amplitude analysis of B0 decays to determine the spin and parity of the Z(4430)+, strongly favoring the 1+ hypothesis based on a large data sample from the Belle experiment.
Contribution
It provides the first detailed amplitude analysis constraining the Z(4430)+'s spin and parity, favoring the 1+ assignment with high statistical significance.
Findings
The Z(4430)+ is most likely a 1+ state.
The analysis rules out other spin-parity hypotheses with high confidence.
Large data sample enhances the precision of the constraints.
Abstract
We perform a full amplitude analysis of B0 -> psi' K+ pi- decays, with psi' -> mu+ mu- or e+ e-, to constrain the spin and parity of the Z(4430)-. The J^P=1+ hypothesis is favored over the 0-, 1-, 2- and 2+ hypotheses at the levels of 3.4 sigma, 3.7 sigma, 4.7 sigma and 5.1 sigma, respectively. The analysis is based on a 711 fb^-1 data sample that contains 772x10^6 B B pairs, collected at the Y(4S) resonance by the Belle detector at the asymmetric-energy e+ e- collider KEKB.
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