Study of the process <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup><mml:mo>→</mml:mo><mml:mn>3</mml:mn><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>π<

Akhmetshin, R.R.; Amirkhanov, A.N.; Anisenkov, A. V.; Aulchenko, V.; Banzarov, V.Sh.; Bashtovoy, N.S.; Berkaev, D. E.; Bondar, A.; Bragin, A.V.; Eidelman, S.; Epifanov, D.; Epshteyn, L.B.; Erofeev, A.L.; Fedotovich, G. V.; Gayazov, S.E.; Grancagnolo, F.; Grebenuk, A.A.; Gribanov, S.S.; Grigoriev, D.N.; Ignatov, F.V.; Иванов, В. Л.; Karpov, S. V.; Kasaev, A. S.; Казанин, В. Ф.; Koop, I. A.; Korobov, A.; Kozyrev, Aleksei; Kozyrev, E. A.; Krokovny, P.; Kuzmenko, A.E.; Kuzmin, A.; Logashenko, I.B.; Lukin, P.; Лысенко, А. П.; Mikhailov, K.; Okhapkin, V.S.; Perevedentsev, E. A.; Pestov, Y.; Попов, А. С.; Razuvaev, G.P.; Рубан, А.А.; Ryskulov, N.M.; Ryzhenenkov, A.E.; Semenov, A.; Shatunov, Yu. M.; Shebalin, V.; Shemyakin, D.N.; Shwartz, B.; Shwartz, D. B.; Sibidanov, A.; Solodov, E. P.; Timoshenko, M. V.; Титов, В.М.; Talyshev, A. A.; Воробйов, А.І.; Zemlyansky, I. M.; Yudin, Yu.V.

doi:10.1016/j.physletb.2013.04.065

Cited by 58 publications

(30 citation statements)

References 19 publications

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“…High statistics, which will be obtained at VEPP-2000, will allow to study dynamics with much better accuracy and reduce this source of systematics. The total cross section of the process e + e − → 3(π + π − ) has been measured using 22 pb −1 of integrated luminosity collected with the CMD-3 detector in the √ s =1.5-2.0 GeV energy range [14]. The measured cross section is in good agreement with all previous experiments.…”

Section: Multipion Productionsupporting

confidence: 78%

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider

Ачасов

Akhmetshin

Anisenkov

et al. 2014

EPJ Web of Conferences

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Abstract. It's good known the difference in 3.5 sigma between the muon (g − 2) experimental result and its calculation in Standard Model. To clarify this intriguing discrepancy the new stage of muon (g − 2) measurement is under preparation at Fermi National Laboratory. On other hand, regular data taking for measurements of hadron cross section production in e + e − annihilations is under way since December 2010 at the electron-positron collider VEPP-2000 with the CMD-3 and SND detectors. The collected data sample corresponds to about 60 inverse picobarns of integrated luminosity per detector in the energy range from 0.32 up to 2 GeV. Preliminary analysis of various hadronic cross sections has been performed. a

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Section: Multipion Productionsupporting

confidence: 78%

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider

Ачасов

Akhmetshin

Anisenkov

et al. 2014

EPJ Web of Conferences

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“…Naturally, this very proximity of theN N threshold suggests that theN N channel should have something to do with the appearance of that structure in the multipion production cross sections. A common speculation is that it could be a signal for app bound state [4,7] or a subtresholdpp resonance [5]. Such a conjecture seems to be also in line with experimental findings in a related reaction, namely e + e − →pp, where a near-threshold enhancement seen in the cross section [8,9] is likewise associated with a possiblepp bound state, cf.…”

Section: Introductionmentioning

confidence: 53%

“…Recently, results from several high-statistics measurements of e + e − annihilation into multipion states have been published [1][2][3][4][5]. One of the striking features in the data is a pronounced structure in the vicinity of the antinucleon-nucleon (N N ) threshold that appears either as a sharp drop for e + e − → 3(π + π − ) [2,4] or as a dip for e + e − → 2(π + π − π 0 ) [2,5], e + e − → ωπ + π − π 0 [2], and for e + e − → 2(π + π − )π 0 [3] in the reaction cross section.…”

Section: Introductionmentioning

confidence: 99%

“…One of the striking features in the data is a pronounced structure in the vicinity of the antinucleon-nucleon (N N ) threshold that appears either as a sharp drop for e + e − → 3(π + π − ) [2,4] or as a dip for e + e − → 2(π + π − π 0 ) [2,5], e + e − → ωπ + π − π 0 [2], and for e + e − → 2(π + π − )π 0 [3] in the reaction cross section. Earlier measurements with lower statistics had already suggested the presence of such a dip, cf.…”

Section: Introductionmentioning

confidence: 99%

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Origin of the structures observed ine+e−annihilation into multipion states around thep¯pthreshold

et al. 2015

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We analyze the origin of the structures observed in the reactions e + e − → 3(π + π − ), 2(π + π − π 0 ), ωπ + π − π 0 , and e + e − → 2(π + π − )π 0 around the antiproton-proton (pp) threshold. We calculate the contribution of the two-step process e + e − →N N → multipions to the total reaction amplitude. The amplitude for e + e − →N N is constrained from near-threshold data on the e + e − →pp cross section and the one forN N → multipions can be likewise fixed from available experimental information, for all those 5π and 6π states. The resulting amplitude for e + e − → multipions turns out to be large enough to play a role for the considered e + e − annihilation channels and, in three of the four reactions, even allows us to reproduce the data quantitatively near theN N threshold. The structures seen in the experiments emerges then as a threshold effect due to the opening of theN N channel.

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“…The cross section e + e − → 3(π + π − ) has been recently measured at the CMD-3 detector in the √ s =1.5-2.0 GeV energy range [12] (Fig. 9).…”

Section: 2mentioning

confidence: 99%

Measurement of the hadronic cross sections at Novosibirsk

Logashenko

Ачасов

Akhmetshin

et al. 2015

EPJ Web of Conferences

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Abstract. Two experiments, CMD-3 and SND, collected over 100 pb −1 in total taking data in 2011-2013 at the VEPP-2000 electron-positron collider. The data sample covers the whole available c.m. energy range from 0.32 GeV to 2.0 GeV. An upgrade of VEPP-2000 started in the second half of 2013, aimed at the luminosity increase up to 10 times at 2.0 GeV. Data taking is expected to resumed in 2015. The current results of analysis of the collected data for various modes of e + e − → hadrons are discussed. VEPP-2000The electron-positron collider VEPP-2000[1, 2] was commissioned at Budker Institute of Nuclear Physics (Novosibirsk, Russia) in 2010. The machine covers the c.m. energy range from √ s = 0.32 GeV to 2.0 GeV and employs the novel technique of round beams to reach a design luminosity up to 10 32 cm −2 s −1 at 2 GeV.Two detectors, CMD-3[3] and SND [4], are installed in the interaction regions of VEPP-2000.CMD-3 (Cryogenic Magnetic Detector) is a generalpurpose detector (Fig. 1). The cylindrical drift chamber with hexagonal cells is surrounded by the Z-chamber, a MWPC with a dual anode and cathode readout, used for precise determination of the fiducial volume for charged particles. The barrel electromagnetic calorimeter, placed outside the superconducting solenoid (0.13X 0 , 13 kGs), is composed of two systems: the Liquid Xenon calorimeter (about 5.4X 0 ), surrounded by the CsI crystal calorimeter (about 8.1X 0 ). The LXe calorimeter has 7 layers and utilizes dual readout: the anode signals are used for a measurement of the total energy deposition, while signals from the cathode strips provide information about a shower proa e-mail: I.B.Logashenko@inp.nsk.su file and are used for a measurement of photon coordinates with high precision (about 1-2 mm). The endcap BGO crystal calorimeter (about 13.4X 0 ) operates in the main magnetic field. The time-of-flight system, designed to identify slow moving particles, is placed between the two layers of the barrel calorimeter. The detector is surrounded by the muon range system. The SND (Fig.2) is a general-purpose nonmagnetic detector. It consists of the 9-layer drift chamber, the aerogel Cherenkov counters, the three-layer spherical electromagnetic calorimeter with 1680 NaI(Tl) crystals and the muon system.The physics program of experiments includes the high precision measurement of cross sections of various modes of e + e − → hadrons, studies of known and searches for new vector mesons, measurement of nn and pp production cross sections near threshold and searches for exotic hadrons.Measurement of the total cross section of e + e − → hadrons in the VEPP-2000 energy range is very interesting in relation with the problem of anomalous magnetic moment of muon, a μ .The most recent measurement of a μ done at BNL with 0.54 ppm precision [5] gave a very interesting outcome:

show abstract

Study of the process e+e−→3(π+π<

Cited by 58 publications

References 19 publications

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider

Origin of the structures observed ine+e−annihilation into multipion states around thep¯pthreshold

Measurement of the hadronic cross sections at Novosibirsk

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Study of the process e+e−→3(π+π<

Cited by 58 publications

References 19 publications

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e+e−collider

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e+e−collider

Origin of the structures observed ine+e−annihilation into multipion states around thep¯pthreshold

Measurement of the hadronic cross sections at Novosibirsk

Contact Info

Product

Resources

About

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider