Spherical Neutral Detector for experiments at VEPP-2000 collider

Ачасов, М. Н.; Aulchenko, V.; Barnyakov, A.; Beloborodov, K.; Berdugin, A.V.; Богданчиков, А. Г.; Botov, A. A.; Bukin, D.A.; Голубев, В. Б.; Grevtsov, K.I.; Dimova, T.; Kardapoltsev, L.; Kharlamov, A. G.; Kovrizhin, D. P.; Korol, A. A.; Koshuba, S. V.; Кравченко, Е. А.; Martin, K. A.; Obrazovsky, A. E.; Onuchin, A. P.; Пахтусова, Е. В.; Serednyakov, S. I.; Shatunov, Yu. M.; Shtol, D.; Shukaev, A.N.; Силагадзе, З. К.; Skovpen, K.; Skrinsky, A.N.; Surin, I. K.; Tikhonov, Yu. A.; Usov, Y.; Vasiljev, A. V.; Vesenev, V.M.

doi:10.1016/j.nuclphysbps.2012.02.015

Cited by 10 publications

(3 citation statements)

References 1 publication

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“…SND [1,2] is a general purpose nonmagnetic detector operating at the VEPP-2000 e + e − collider in the center-of-mass energy range from 0.2 to 2.0 GeV [3]. Experimental studies include measurements of the cross sections of the e + e − annihilation processes into hadrons.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the e+e− → π+π− process cross section with the SND detector at the VEPP-2000 collider in the energy region 0.525 < $$ \sqrt{s} $$ < 0.883 GeV

Ачасов

Baykov

Barnyakov

et al. 2021

J. High Energ. Phys.

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The cross section of the process e+e− → π+π− has been measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2000 e+e− collider VEPP-2000 in the energy region 525 <$$ \sqrt{s} $$ s < 883 MeV. The measurement is based on data with an integrated luminosity of about 4.6 pb−1. The systematic uncertainty of the cross section determination is 0.8% at $$ \sqrt{s} $$ s > 0.600 GeV. The ρ meson parameters are obtained as mρ = 775.3 ± 0.5 ± 0.6 MeV, Γρ = 145.6 ± 0.6 ± 0.8 MeV, Bρ→e+e− × Bρ→π+π− = (4.89 ± 0.02 ± 0.04) × 10−5, and the parameters of the e+e− → ω → π+π− process, suppressed by G-parity, as Bω→e+e− × Bω→π+π− = (1.32 ± 0.06 ± 0.02) × 10−6 and and ϕρω = 110.7 ± 1.5 ± 1.0 degrees.

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Section: Introductionmentioning

confidence: 99%

Measurement of the e+e− → π+π− process cross section with the SND detector at the VEPP-2000 collider in the energy region 0.525 < $$ \sqrt{s} $$ < 0.883 GeV

Ачасов

Baykov

Barnyakov

et al. 2021

J. High Energ. Phys.

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“…Light mesons are also studied at e + e − machines using two-photon processes, processes with initial-state radiation, and multi-body decays of tau leptons or heavy-quark mesons. The CMD-3 [316] and SND [317,318] experiments at BINP perform high-precision exclusive measurements of e + e − → hadrons cross sections up to center-of-momentum energies of 2 GeV. These data allow detailed studies of the properties of the light vector mesons ρ, ω, φ and of their excited states in a large variety of final states.…”

Section: Discussionmentioning

confidence: 99%

Light-Meson Spectroscopy with COMPASS

Ketzer,

Grube,

Ryabchikov

2019

Preprint

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Despite decades of research, we still lack a detailed quantitative understanding of the way quantum chromodynamics (QCD) generates the spectrum of hadrons. Precise experimental studies of the hadron excitation spectrum and the dynamics of hadrons help to improve models and to test effective theories and lattice QCD simulations. In addition, QCD seems to allow hadrons beyond the three-quark and quark-antiquark configurations of the constituent-quark model. These so-called exotic hadrons contain additional constituent (anti)quarks or excited gluonic fields that contribute to the quantum numbers of the hadron. Hadron spectroscopy is currently one of the most active fields of research in hadron physics. The COMPASS experiment at the CERN SPS is studying the excitation spectrum of light mesons, which are composed of up, down, and strange quarks. The excited mesons are produced via the strong interaction, i.e. by Pomeron exchange, by scattering a 190 GeV/c pion beam off proton or nuclear targets. On heavy nuclear targets, in addition the electromagnetic interaction contributes in the form of quasi-real photon exchange at very low four-momentum transfer squared. COMPASS has performed the most comprehensive analyses to date of isovector resonances decaying into ηπ, η π, or π − π − π + final states. In this review, we give a general and pedagogical introduction into scattering theory and the employed partial-wave analysis techniques. We also describe novel methods developed for the high-precision COMPASS data. The COMPASS results are summarized and compared to previous measurements. In addition, we discuss possible signals for exotic mesons and conclude that COMPASS data provide solid evidence for the existence of the manifestly exotic π 1 (1600), which has quantum numbers forbidden for a quark-model state, and of the a 1 (1420), which does not fit into the quark-model spectrum. By isolating the contributions from quasi-real photon exchange, COMPASS has measured the radiative widths of the a 2 (1320) and, for the first time, that of the π 2 (1670) and has tested predictions of chiral perturbation theory for the process π − + γ → π − π − π + .

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“…Spherical Neutral Detector (SND) worked at VEPP-2M e + e − collider from 1995 to 2000 [1]. After upgrade [2] it works at VEPP-2000VEPP- (from 2009. SND consists of tracking system, particle identification system based on aerogel threshold Cherenkov counter, electromagnetic calorimeter and muon system (figure 1).…”

Section: Introductionmentioning

confidence: 99%

Muon system of SND detector

et al. 2014

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The Spherical Neutral Detector muon system composed of proportional tubes and plastic scintillation counters is described. This system is constructed for the SND detector collecting data at VEPP-2000 e + e − collider. The results of the muons and pions detection efficiency measurements are presented. These measurements are performed using e + e − → µ + µ − , e + e − → π + π − , e + e − → π + π − π 0 π 0 , e + e − → e + e − processes and cosmic muons. Efficiency for muons is 95.5% for the energies 0.6-1.0 GeV and becomes much lower in energy range 0.45-0.60 GeV. Pions detection efficiency varies from 0 at 0.4 GeV to 56% at 1.0 GeV. Probability of the muon system hit from electon/positron is no more than 0.43%. KEYWORDS: Particle identification methods; Wire chambers(MWPC, Thin-gap chambers, drift chambers, drift tubes, proportional chambers etc); Gaseous detectors; Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)

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Spherical Neutral Detector for experiments at VEPP-2000 collider

Cited by 10 publications

References 1 publication

Measurement of the e+e− → π+π− process cross section with the SND detector at the VEPP-2000 collider in the energy region 0.525 < $$ \sqrt{s} $$ < 0.883 GeV

Measurement of the e+e− → π+π− process cross section with the SND detector at the VEPP-2000 collider in the energy region 0.525 < $$ \sqrt{s} $$ < 0.883 GeV

Light-Meson Spectroscopy with COMPASS

Muon system of SND detector

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