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16–21 Aug 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

The study of four charged pions production with CMD-3 detector at VEPP-2000 collider

Not scheduled
15m
Guilin Bravo Hotel, Guilin, China

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Poster Posters

Speaker

Mr Alexandr Korobov (Budker Institute of Nuclear Physics)

Description

Since 2010 the VEPP-2000 electron-positron collider has been operated at Budker Institute of Nuclear Physics in the center-of-mass (c.m.) energy range from $\sqrt{s}=320$ MeV to $2000$ MeV. VEPP-2000 has two interaction regions in which the Cryogenic Magnetic Detector (CMD-3) and the Spherical Neutral Detector (SND) are installed. Production of four charged pions in $e^+ e^-$ annihilation has been studied before with good statistics at the CMD-2 and SND detectors as well as using initial-state radiation (ISR) with BaBar at which a low systematic uncertainty of about 3% was achieved for the $e^+ e^- \to \pi^{+}\pi^{-}\pi^{+}\pi^{-}$ cross section in the wide c.m. energy range. In this work the cross section of the process $e^+ e^- \to \pi^{+}\pi^{-}\pi^{+}\pi^{-}$ has been measured using an integrated luminosity of 168 pb$^{-1}$ collected with the CMD-3 detector in the c.m. energy range 650-2000 MeV. Also studied are the internal dynamics of four-pion production. High-precision measurements of various hadronic cross sections are of great interest in relation with the problem of the muon anomalous magnetic moment g-2. The $e^+ e^- \to \pi^{+}\pi^{-}\pi^{+}\pi^{-}$ cross section can be also used to test relations between $e^+e^-$ annihilation and $\tau$ lepton decays based on conservation of vector current.

Primary author

Mr Alexandr Korobov (Budker Institute of Nuclear Physics)

Co-author

Simon Eidelman (Budker Institute of Nuclear Physics)

Presentation materials

There are no materials yet.