Phase motion in the Z−(4430) amplitude in B0→ψ′π−K+ decay
In view of the proliferation in the number of new charmonium states, it is really important to have an experimental way to prove that an observed bump is, indeed, a real resonance. To do that, in this paper we present an alternative method to demonstrate the resonant behavior of a state. With this m...
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doaj-f231713d47294cee958acb58cd9838272020-11-25T01:50:49ZengElsevierPhysics Letters B0370-26931873-24452015-09-01748C18719010.1016/j.physletb.2015.06.079Phase motion in the Z−(4430) amplitude in B0→ψ′π−K+ decayIgnacio Bediaga0Jussara M. de Miranda1Fernando Rodrigues2Marina Nielsen3Centro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, BrazilCentro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, BrazilCentro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, BrazilInstituto de Física, Universidade de São Paulo, C.P. 66318, 05314-970 São Paulo, SP, BrazilIn view of the proliferation in the number of new charmonium states, it is really important to have an experimental way to prove that an observed bump is, indeed, a real resonance. To do that, in this paper we present an alternative method to demonstrate the resonant behavior of a state. With this method, the phase variation of a generic complex amplitude can be directly revealed through interference in the Dalitz-plot region where it crosses a well established resonant state, used as a probe. We have tested the method for the Z−(4430) state by generating Monte Carlo samples for the B0→ψ(2S)π−K+ decay channel. We have shown that the proposed method gives a clear oscillation behavior, related to the phase variation associated with a real resonant state, in the case where the Z−(4430) is considered as a regular resonance with a strong phase variation.http://www.sciencedirect.com/science/article/pii/S0370269315005109 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ignacio Bediaga Jussara M. de Miranda Fernando Rodrigues Marina Nielsen |
spellingShingle |
Ignacio Bediaga Jussara M. de Miranda Fernando Rodrigues Marina Nielsen Phase motion in the Z−(4430) amplitude in B0→ψ′π−K+ decay Physics Letters B |
author_facet |
Ignacio Bediaga Jussara M. de Miranda Fernando Rodrigues Marina Nielsen |
author_sort |
Ignacio Bediaga |
title |
Phase motion in the Z−(4430) amplitude in B0→ψ′π−K+ decay |
title_short |
Phase motion in the Z−(4430) amplitude in B0→ψ′π−K+ decay |
title_full |
Phase motion in the Z−(4430) amplitude in B0→ψ′π−K+ decay |
title_fullStr |
Phase motion in the Z−(4430) amplitude in B0→ψ′π−K+ decay |
title_full_unstemmed |
Phase motion in the Z−(4430) amplitude in B0→ψ′π−K+ decay |
title_sort |
phase motion in the z−(4430) amplitude in b0→ψ′π−k+ decay |
publisher |
Elsevier |
series |
Physics Letters B |
issn |
0370-2693 1873-2445 |
publishDate |
2015-09-01 |
description |
In view of the proliferation in the number of new charmonium states, it is really important to have an experimental way to prove that an observed bump is, indeed, a real resonance. To do that, in this paper we present an alternative method to demonstrate the resonant behavior of a state. With this method, the phase variation of a generic complex amplitude can be directly revealed through interference in the Dalitz-plot region where it crosses a well established resonant state, used as a probe. We have tested the method for the Z−(4430) state by generating Monte Carlo samples for the B0→ψ(2S)π−K+ decay channel. We have shown that the proposed method gives a clear oscillation behavior, related to the phase variation associated with a real resonant state, in the case where the Z−(4430) is considered as a regular resonance with a strong phase variation. |
url |
http://www.sciencedirect.com/science/article/pii/S0370269315005109 |
work_keys_str_mv |
AT ignaciobediaga phasemotioninthez4430amplitudeinb0pspkdecay AT jussaramdemiranda phasemotioninthez4430amplitudeinb0pspkdecay AT fernandorodrigues phasemotioninthez4430amplitudeinb0pspkdecay AT marinanielsen phasemotioninthez4430amplitudeinb0pspkdecay |
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