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Measurement of resonant and $CP$ components in $\overline{B}_s^0\rightarrow J/\psi \pi^+\pi^-$ decays
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arxiv 1402.6248 v1 pith:2EAO2BM7 submitted 2014-02-25 hep-ex
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abstract
The resonant structure of the decay $\overline{B}_s^0\to J/\psi\pi^+\pi^-$ is studied using data corresponding to 3 fb$^{-1}$ of integrated luminosity from $pp$ collisions by the LHC and collected by the LHCb detector. Five interfering $\pi^+\pi^-$ states are required to describe the decay: $f_0(980),f_0(1500),f_0(1790),f_2(1270)$, and $f_2^{\prime}(1525)$. An alternative model including these states and a non-resonant $J/\psi \pi^+\pi^-$ component also provides a good description of the data. Based on the different transversity components measured for the spin-2 intermediate states, the final state is found to be compatible with being entirely $CP$-odd. The $CP$-even part is found to be $<2.3$% at 95% confidence level. The $f_0(500)$ state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the $f_0(980)$ of $<7.7^{\circ}$ at 90% confidence level, consistent with a tetraquark interpretation of the $f_0(980)$ substructure.
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Quasi-Two-Body $B\to P (K^+K^-, \pi^+\pi^-)$ Decays with $f_0(980)$ Resonance
hep-ph 2025-01 conditional novelty 5.0 of 10
PQCD predictions for quasi-two-body B -> P f0(980) -> P(K+K-, π+π-) decays, with two-body B -> P f0(980) branching fractions extracted from the pion mode.
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