We study the process e+e−→π+π−π+π−γ, with a hard photon radiated from the initial state. About 60 000 fully reconstructed events have been selected from 89  fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective e+e− e+e− center-of-mass energy, so that these data can be compared with the corresponding direct e+e− measurements. From the 4π -mass spectrum, the cross section for the process e+e− →π+π−π+π− is measured for center-of-mass energies from 0.6 to 4.5 GeV. The uncertainty in the cross section measurement is typically 5%. We also measure the cross sections for the final states K+K−π+π− and K+K−K+K−. We observe the J/ψ in all three final states and measure the corresponding branching fractions. We search for X(3872) in J/ψ(→μ+μ−)π+π− and obtain an upper limit on the product of the e+e− width of the X(3872) and the branching fraction for X(3872)→J/ψπ+π−.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). e+e−→π+π−π+π−, K+K−π+π−, and K+K−K+K− cross sections at center-of-mass energies 0.5–4.5 GeV measured with initial-state radiation. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 71(5), 1-25 [10.1103/PhysRevD.71.052001].

e+e−→π+π−π+π−, K+K−π+π−, and K+K−K+K− cross sections at center-of-mass energies 0.5–4.5 GeV measured with initial-state radiation

PATRIGNANI, CLAUDIA;
2005

Abstract

We study the process e+e−→π+π−π+π−γ, with a hard photon radiated from the initial state. About 60 000 fully reconstructed events have been selected from 89  fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective e+e− e+e− center-of-mass energy, so that these data can be compared with the corresponding direct e+e− measurements. From the 4π -mass spectrum, the cross section for the process e+e− →π+π−π+π− is measured for center-of-mass energies from 0.6 to 4.5 GeV. The uncertainty in the cross section measurement is typically 5%. We also measure the cross sections for the final states K+K−π+π− and K+K−K+K−. We observe the J/ψ in all three final states and measure the corresponding branching fractions. We search for X(3872) in J/ψ(→μ+μ−)π+π− and obtain an upper limit on the product of the e+e− width of the X(3872) and the branching fraction for X(3872)→J/ψπ+π−.
2005
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). e+e−→π+π−π+π−, K+K−π+π−, and K+K−K+K− cross sections at center-of-mass energies 0.5–4.5 GeV measured with initial-state radiation. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 71(5), 1-25 [10.1103/PhysRevD.71.052001].
Aubert, B; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Tisserand, V.; Zghiche, A.; Grauges-Pous, E.; Palano, A.; P...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

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/11585/551912
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 160
  • ???jsp.display-item.citation.isi??? 136
social impact