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Measurement of resonant and $CP$ components in $\overline{B}_s^0\rightarrow J/\psi \pi^+\pi^-$ decays

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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http://hal.in2p3.fr/in2p3-00952057
Contributor : Sabine Starita <>
Submitted on : Wednesday, February 26, 2014 - 10:32:47 AM
Last modification on : Friday, November 20, 2020 - 3:30:14 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Measurement of resonant and $CP$ components in $\overline{B}_s^0\rightarrow J/\psi \pi^+\pi^-$ decays. Physical Review D, American Physical Society, 2014, 89, pp.092006. ⟨10.1103/PhysRevD.89.092006⟩. ⟨in2p3-00952057⟩

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