The results of an amplitude analysis of the charmless three-body decay B+ → π+ π+ π−, in which CP-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of 3 fb^−1 of pp collisions recorded with the LHCb detector. The most challenging aspect of the analysis is the description of the behavior of the π+ π− S-wave contribution, which is achieved by using three complementary approaches based on the isobar model, the K-matrix formalism, and a quasi-model-independent procedure. Additional resonant contributions for all three methods are described using a common isobar model, and include the ρ(770)0, ω(782) and ρ(1450)0 resonances in the π+ π− P-wave, the f2(1270) resonance in the π+ π− D-wave, and the ρ_3(1690)0 resonance in the π+ π− F-wave. Significant CP-violation effects are observed in both S- and D-waves, as well as in the interference between the S- and P-waves. The results from all three approaches agree and provide new insight into the dynamics and the origin of CP-violation effects in B+ → π+ π+ π− decays.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C.A., Ajaltouni, Z., et al. (2020). Amplitude Analysis of the B+ → π+ π+ π− Decay. PHYSICAL REVIEW D, 101(1), 1-46 [10.1103/PhysRevD.101.012006].

Amplitude Analysis of the B+ → π+ π+ π− Decay

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Gioventù, A.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2020

Abstract

The results of an amplitude analysis of the charmless three-body decay B+ → π+ π+ π−, in which CP-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of 3 fb^−1 of pp collisions recorded with the LHCb detector. The most challenging aspect of the analysis is the description of the behavior of the π+ π− S-wave contribution, which is achieved by using three complementary approaches based on the isobar model, the K-matrix formalism, and a quasi-model-independent procedure. Additional resonant contributions for all three methods are described using a common isobar model, and include the ρ(770)0, ω(782) and ρ(1450)0 resonances in the π+ π− P-wave, the f2(1270) resonance in the π+ π− D-wave, and the ρ_3(1690)0 resonance in the π+ π− F-wave. Significant CP-violation effects are observed in both S- and D-waves, as well as in the interference between the S- and P-waves. The results from all three approaches agree and provide new insight into the dynamics and the origin of CP-violation effects in B+ → π+ π+ π− decays.
2020
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C.A., Ajaltouni, Z., et al. (2020). Amplitude Analysis of the B+ → π+ π+ π− Decay. PHYSICAL REVIEW D, 101(1), 1-46 [10.1103/PhysRevD.101.012006].
Aaij, R.; Abellán Beteta, C.; Adeva, B.; Adinolfi, M.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M....espandi
File in questo prodotto:
File Dimensione Formato  
2020-AR-02-Amplitude_Analysis_of_the_Bp_to_pip_pip_pim_Decay-PRD.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 4.85 MB
Formato Adobe PDF
4.85 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/720640
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 75
  • ???jsp.display-item.citation.isi??? 53
social impact