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The investigation of the Coulomb interaction in $\pi^+ \pi^-$ pair production and application of the effect to the event simulation and setup description / Benelli, A. (CTU, Prague) ; Nemenov, L. (JINR, Dubna) ; Pentia, M. (IFIN-HH, Bucharest) ; Smolik, J. (CTU, Prague)
In this work we present the Coulomb effects in the π +π − pair analysis and show the application of these effects in high energy physics investigations. [...]
DIRAC-NOTE-2023-01. - 2023. - 16 p.
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The $\pi^+\pi^-$ Coulomb interaction study and its use in the data processing / Adeva, B. (Santiago de Compostela U.) ; Afanasyev, L. (Dubna, JINR) ; Anania, A. (INFN, Messina) ; Aogaki, S. (Bucharest, IFIN-HH) ; Benelli, A. (Prague, Tech. U.) ; Brekhovskikh, V. (Serpukhov, IHEP) ; Cechak, T. (Prague, Tech. U.) ; Chiba, M. (Tokyo Metropolitan U.) ; Chliapnikov, P. (Serpukhov, IHEP) ; Drijard, D. (Prague, Tech. U. ; CERN) et al.
In this work the Coulomb effects (Coulomb correlations) were studied using experimental $\pi^+\pi^-$ pair distributions in $Q$, the relative momentum in the pair center of mass system (c.m.s), and its projections $Q_L$ (longitudinal component) and $Q_t$ (transverse component) relative to the pair direction in the laboratory system (l.s.). The major part of the pion pairs is produced by decay of $\rho, \omega$ and $\Delta$ and other short-lived sources (Coulomb pairs). [...]
arXiv:2409.12696; CERN-EP-2023-276.- Geneva : CERN, 2024-11-01 - 11 p. - Published in : Phys. Rev. D 110 (2024) 092005 Draft (restricted): PDF; Fulltext: DIRAC-Coulomb-correct - PDF; 2409.12696 - PDF;

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Investigation of $K^+K^-$ pairs in the effective mass region near $2m_K$ / DIRAC Collaboration
The DIRAC experiment at CERN investigated in the reaction $\rm{p}(24~\rm{GeV}/c) + Ni$ the particle pairs $K^+K^-, \pi^+ \pi^-$ and $p \bar{p}$ with relative momentum $Q$ in the pair system less than 100 MeV/c. Because of background influence studies, DIRAC explored three subsamples of $K^+K^-$ pairs, obtained by subtracting -- using time-of-flight (TOF) technique -- background from initial $Q$ distributions with $K^+K^-$ sample fractions more than 70%, 50% and 30%. [...]
arXiv:2204.01857; CERN-EP-2022-058.- 2022-08-01 - 18 p. - Published in : Phys. Rev. D 106 (2022) 032006 Fulltext: PhysRevD.106.032006 - PDF; 2204.01857 - PDF;

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The estimation of production rates of ${\pi }^{+}{K}^{-}$, ${\pi }^{-}{K}^{+}$ and ${\pi }^{+}{\pi }^{-}$ atoms in proton–nucleus interactions at 450 GeV c$^{-1}$ / Gorchakov, O E (Dubna, JINR) ; Nemenov, L L (Dubna, JINR)
Short-lived ($\tau \sim 3\times {10}^{-15}\,s$) ${\pi }^{+}{K}^{-}$, ${K}^{+}{\pi }^{-}$ and ${\pi }^{+}{\pi }^{-}$ atoms as well as long-lived ($\tau \geqslant 1\times {10}^{-11}$ s) ${\pi }^{+}{\pi }^{-}$ atoms produced in proton–nucleus interactions at 24 GeV c(–)(1) are observed and studied in the DIRAC experiment at the CERN Proton Synchroton. The purpose of this paper is to show that the yields of the short-lived ${\pi }^{+}{K}^{-}$, ${K}^{+}{\pi }^{-}$ and ${\pi }^{+}{\pi }^{-}$ atoms in proton–nucleus interactions at 450 GeV c(–)(1) and ${\theta }_{{\rm{lab}}}=4^\circ $ are estimated to be, respectively 67 ± 13, 31 ± 6 and 15 ± 2 times higher. [...]
DIRAC-PUB-2016-01.- 2016 - 17 p. - Published in : J. Phys. G 43 (2016) 095004

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DIRAC Collaboration status report to SPSC / Nemenov, L (JINR)
K+K- pair production analysis in the effective mass region near 2 Kaon masses based on DIRAC Collaboration experimental data. [...]
CERN-SPSC-2020-021 ; SPSC-SR-276. - 2020.
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DIRAC status report / Nemenov, L
Status report 2018
CERN-SPSC-2018-032 ; SPSC-SR-242. - 2018.
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First measurement of a long-lived $\pi^+ \pi^-$ atom lifetime / DIRAC Collaboration
The adapted DIRAC experiment at the CERN PS accelerator observed for the first time long-lived hydrogen-like $\pi^+\pi^-$ atoms, produced by protons hitting a beryllium target. A part of these atoms crossed the gap of 96~mm and got broken up in the 2.1~\textmu{}m thick platinum foil. [...]
arXiv:1811.08659; CERN-EP-2018-281; DIRAC-PUB-2019-01.- Geneva : CERN, 2019-03-01 - 7 p. - Published in : Phys. Rev. Lett. 122 (2019) 082003 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 1811.08659 - PDF; CERN-EP-2018-281 - PDF;

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DIRAC collaboration status report / Nemenov, L (JINR)
Annual report of DIRAC collaboration..
CERN-SPSC-2018-022 ; SPSC-SR-235. - 2018.
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DIRAC status report 2017 (SPSC) / Nemenov, L
DIRAC status report 2017 (SPSC)
CERN-SPSC-2017-042 ; SPSC-SR-224. - 2017.
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10.

DIRAC collaboration status report / Nemenov, Leonid (JINR Dubna)
Annual status report of DIRAC collabration
CERN-SPSC-2017-032 ; SPSC-SR-218. - 2017.
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Vegeu també: autors amb noms similars
24	Nemenov, L L
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5	Nemenov, Leonid
8	Nemenov, Leonid L

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