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

R. Aaij; Y. Amhis; S. Barsuk; M. Borsato; O. Callot; J. He; O. Kochebina; J. Lefrançois; F. Machefert; A. Martin Sanchez; Marie Nicol; P. Robbe; M.-H. Schune; M. Teklishyn; A. Vallier; B. Viaud; E. Ben-Haim; M. Benayoun; P. David; L. del Buono; A. Martens; D.A. Milanes; F. Polci; E. Aslanides; J. Cogan; W. Kanso; R. Legac; O. Leroy; G. Mancinelli; A. Mordà; M. Perrin-Terrin; M. Sapunov; J. Serrano; A. Tsaregorodtsev; Ziad Ajaltouni; M. Baalouch; E. Cogneras; O. Deschamps; I. El Rifai; M. Grabalosa Gándara; Pierre Henrard; M. Hoballah; R. Lefèvre; J. Maratas; S. Monteil; V. Niess; Pascal Perret; Diego Alejandro Roa Romero; L. Beaucourt; D. Decamp; N. Déléage; Ph. Ghez; J.-P. Lees; J.F. Marchand; M.-N. Minard; B. Pietrzyk; W. Qian; S. t'Jampens; V. Tisserand; E. Tournefier

doi:10.1103/PhysRevD.90.012003

Journal articles

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

R. Aaij Y. Amhis ¹ S. Barsuk ¹ M. Borsato ¹ O. Callot ¹ J. He ¹ O. Kochebina ¹ J. Lefrançois ¹ F. Machefert ¹ A. Martin Sanchez ¹ Marie Nicol ¹ P. Robbe ¹ M.-H. Schune ¹ M. Teklishyn ¹ A. Vallier ¹ B. Viaud ¹ E. Ben-Haim ² M. Benayoun ² P. David ² L. del Buono ² A. Martens ² D.A. Milanes ² F. Polci ² E. Aslanides ³ J. Cogan ³ W. Kanso ³ R. Legac ³ O. Leroy ³ G. Mancinelli ³ A. Mordà ^{3, 4} M. Perrin-Terrin ³ M. Sapunov ³ J. Serrano ³ A. Tsaregorodtsev ³ Ziad Ajaltouni ⁵ M. Baalouch ⁵ E. Cogneras ⁵ O. Deschamps ⁵ I. El Rifai ⁵ M. Grabalosa Gándara ⁵ Pierre Henrard ⁵ M. Hoballah ⁵ R. Lefèvre ⁵ J. Maratas ⁵ S. Monteil ⁵ V. Niess ⁵ Pascal Perret ⁵ Diego Alejandro Roa Romero ⁵ L. Beaucourt ⁶ D. Decamp ⁶ N. Déléage ⁶ Ph. Ghez ⁶ J.-P. Lees ⁶ J.F. Marchand ⁶ M.-N. Minard ⁶ B. Pietrzyk ⁶ W. Qian ⁶ S. t'Jampens ⁶ V. Tisserand ⁶ E. Tournefier ⁶

1 LAL - Laboratoire de l'Accélérateur Linéaire

2 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies

3 CPPM - Centre de Physique des Particules de Marseille

4 CPT - Centre de Physique Théorique - UMR 7332

5 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

6 LAPP - Laboratoire d'Annecy de Physique des Particules

Abstract : The resonant structure of the reaction $\overline{B}^0\rightarrow J/\psi \pi^+\pi^-$ is studied using data from 3 fb$^{-1}$ of integrated luminosity collected by the LHCb experiment, one-third at 7 Tev center-of-mass energy and the remainder at 8 Tev. The invariant mass of the $\pi^+\pi^-$ pair and three decay angular distributions are used to determine the fractions of the resonant and non-resonant components. Six interfering $\pi^+\pi^-$ states: $\rho(770)$, $f_0(500)$, $f_2(1270)$, $\rho(1450)$, $\omega(782)$ and $\rho(1700)$ are required to give a good description of invariant mass spectra and decay angular distributions. The positive and negative CP fractions of each of the resonant final states are determined. The $f_0(980)$ meson is not seen and the upper limit on its presence, compared with the observed $f_0(500)$ rate, is inconsistent with a model of tetraquark substructure for these scalar mesons at the eight standard deviation level. In the $q\overline{q}$ model, the absolute value of the mixing angle between the $f_0(980)$ and the $f_0(500)$ scalar mesons is limited to be less than $17^{\circ}$ at 90% confidence level.

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Journal articles

Domain :

Physics [physics] / High Energy Physics - Experiment [hep-ex]

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http://hal.in2p3.fr/in2p3-00982630
Contributor : Sabine Starita <>
Submitted on : Thursday, April 24, 2014 - 10:52:25 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:13 PM

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

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

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