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1.
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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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2.
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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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3.
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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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4.
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Coupled channel analysis of $\pi^+ \pi^ -\pi^0$, $K^+ K^- \pi^0$ and $K^{\pm} K^0_S \pi^{\mp}$ from $\bar p p$ annihilation at rest in hydrogen targets at three densities
/ Bargiotti, M (Bologna U. ; INFN, Bologna) ; Bertin, A (Bologna U. ; INFN, Bologna) ; Bruschi, M (Bologna U. ; INFN, Bologna) ; Capponi, M (Bologna U. ; INFN, Bologna) ; De Castro, S (Bologna U. ; INFN, Bologna) ; Fabbri, L (Bologna U. ; INFN, Bologna) ; Faccioli, P (Bologna U. ; INFN, Bologna) ; Galli, D (Bologna U. ; INFN, Bologna) ; Giacobbe, B (Bologna U. ; INFN, Bologna) ; Marconi, U (Bologna U. ; INFN, Bologna) et al.
/OBELIX
The $\pi^+ \pi^ -\pi^0$, $K^+ K^- \pi^0$ and $K^\pm K^0 \pi^\mp$ final states produced by $\bar p p$ annihilation at rest at three different hydrogen target densities have been analyzed in the frame of a coupled channel analysis together with $\pi \pi$, $\pi K$ and $K \bar K$ scattering data. The percentages of the different partial waves, the branching ratios and the parameters (masses, widths, $\pi \pi$ and $K \bar K$ partial widths) of all the involved resonances ($J^P = 0^+, 1^-, 2^+$) have been measured. [...]
2002 - 18 p.
- Published in : Eur. Phys. J. C 26 (2003) 371-388
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5.
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Measurement of the $\pi K$ atom lifetime and the $\pi K$ scattering length
/ DIRAC Collaboration
After having announced the statistically significant observation (5.6~$\sigma$) of the new exotic $\pi K$ atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, based on the full $\pi K$ data sample: $\tau = (5.5^{+5.0}_{-2.8}) \cdot 10^{-15}s$. By means of a precise relation ($<1\%$) between atom lifetime and scattering length, the following value for the S-wave isospin-odd $\pi K$ scattering length $a_0^{-}~=~\frac{1}{3}(a_{1/2}-a_{3/2})$ has been derived: $\left|a_0^-\right| = (0.072^{+0.031}_{-0.020}) M_{\pi}^{-1}$..
arXiv:1707.02184; CERN-EP-2017-137; DIRAC-PUB-2017-01.-
Geneva : CERN, 2017-09-19 - 18 p.
- Published in : Phys. Rev. D 96 (2017) 052002
Draft (restricted): PDF; Fulltext: CERN-EP-2017-137 - PDF; arXiv:1707.02184 - PDF; Fulltext from publisher: PDF;
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6.
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The X-ray machine for the examination of quantum mechanics
/ Curceanu, Catalina (Frascati ; Bucharest, IFIN-HH ; Enrico Fermi Ctr., Rome) ; Bartalucci, Sergio (Frascati) ; Bassi, Angelo (Trieste U.) ; Bazzi, Massimiliano (Frascati) ; Bertolucci, Sergio (CERN) ; Berucci, Carolina (Frascati ; Stefan Meyer Inst. Subatomare Phys.) ; Bragadireanu, Alexandru Mario (Bucharest, IFIN-HH) ; Cargnelli, Michael (Stefan Meyer Inst. Subatomare Phys.) ; Clozza, Alberto (Frascati) ; De Paolis, Luca (Frascati) et al.
By performing X-rays measurements in the underground laboratory of Gran Sasso, LNGS-INFN, we test a basic principle of quantum mechanics: the Pauli exclusion principle (PEP). In the future, we aim to use a similar experimental technique to search for X-rays as a signature of the spontaneous collapse of the wave function predicted by continuous spontaneous localization theories. [...]
2016 - 10 p.
- Published in : Int. J. Quant. Inf. 14 (2016) 1640017
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7.
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Underground Test of Quantum Mechanics: The VIP2 Experiment
/ Marton, Johann (Stefan Meyer Inst. Subatomare Phys.) ; Bartalucci, S. (Frascati) ; Bassi, A. (INFN, Trieste ; Trieste U.) ; Bazzi, M. (Frascati) ; Bertolucci, S. (CERN) ; Berucci, C. (Stefan Meyer Inst. Subatomare Phys.) ; Bragadireanu, M. (Bucharest, IFIN-HH) ; Cargnelli, M. (Stefan Meyer Inst. Subatomare Phys.) ; Clozza, A. (Frascati) ; Curceanu, C. (Frascati ; Enrico Fermi Ctr., Rome) et al.
We are experimentally investigating possible violations of standard quantum mechanics predictions in the Gran Sasso underground laboratory in Italy. We test with high precision the Pauli Exclusion Principle and the collapse of the wave function (collapse models). [...]
arXiv:1703.10055.-
2018 - 16 p.
- Published in : 10.1007/978-3-319-74971-6_13
Fulltext: PDF;
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8.
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9.
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Observation of $\pi^- K^+$ and $\pi^+ K^-$ atoms
/ DIRAC Collaboration
The observation of hydrogen-like $\pi K$ atoms, consisting of $\pi^- K^+$ or $\pi^+ K^-$ mesons, is presented. The atoms have been produced by 24 GeV/$c$ protons from the CERN PS accelerator, interacting with platinum or nickel foil targets. [...]
arXiv:1605.06103; CERN-EP-2016-128; DIRAC-PUB-2016-02.-
Geneva : CERN, 2016-09-08 - 6 p.
- Published in : Phys. Rev. Lett. 117 (2016) 112001
Draft (restricted): PDF; Fulltext: arXiv:1605.06103 - PDF; 10.1103_PhysRevLett.117.112001 - PDF; PhysRevLett.117.112001 - PDF; Preprint: PDF; External link: Fulltext
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10.
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Application of photon detectors in the VIP2 experiment to test the Pauli Exclusion Principle
/ Pichler, A. (Stefan Meyer Inst. Subatomare Phys.) ; Bartalucci, S. (Frascati) ; Bazzi, M. (Frascati) ; Bertolucci, S. (CERN) ; Berucci, C. (Stefan Meyer Inst. Subatomare Phys. ; Frascati) ; Bragadireanu, M. (Frascati ; Bucharest, IFIN-HH) ; Cargnelli, M. (Stefan Meyer Inst. Subatomare Phys.) ; Clozza, A. (Frascati) ; Curceanu, C. (Frascati ; Bucharest, IFIN-HH) ; De Paolis, L. (Frascati) et al.
The Pauli Exclusion Principle (PEP) was introduced by the austrian physicist Wolfgang Pauli in 1925. Since then, several experiments have checked its validity. [...]
arXiv:1602.00898.-
2016-06-09 - 5 p.
- Published in : J. Phys.: Conf. Ser. 718 (2016) 052030
Fulltext: PDF; Fulltext from Publisher: PDF; IOP Open Access article: PDF; External link: Preprint
In : 14th International Conference on Topics in Astroparticle and Underground Physics, Torino, Italy, 7 - 11 Sep 2015, pp.052030
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