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1.
First observation of ππK atom and its lifetime measurement / Adeva, B (Santiago de Compostela U.) ; Afanasiev, L G (Dubna, JINR) ; Berka, Z (Prague, Tech. U.) ; Brekhovskikh, V (Serpukhov, IHEP) ; Caragheorgheopol, G (Bucharest, IFIN-HH) ; Cechák, T (Prague, Tech. U.) ; Chiba, M (Tokyo Metropolitan U.) ; Costantini, S (Basel U.) ; Constantinescu, S (Bucharest, IFIN-HH) ; Détraz, C (CERN) et al.
CERN-SPSC-2000-032 ; SPSC-P-284-ADD-2 ; DIRAC-NOTE-2000-09 ; DIRAC-DOC-2000-01.
- 2000. - 75 p.
Fulltext - Fulltext
2.
Detection of π+ππ+π atoms with the DIRAC spectrometer at CERN / DIRAC Collaboration
The goal of the DIRAC experiment at CERN is to measure with high precision the lifetime of the π+ππ+π atom (A2πA2π), which is of order 3×10153×1015 s, and thus to determine the s-wave ππππ-scattering lengths difference |a0a2||a0a2|. A2πA2π atoms are detected through the characteristic features of π+ππ+π pairs from the atom break-up (ionization) in the target. [...]
hep-ex/0409053; DIRAC-PUB-2004-03.- 2004 - 19 p. - Published in : J. Phys. G 30 (2004) 1929-1946 Access to fulltext document: PDF; Fulltext: PDF; External link: hep-ex/0409053 PDF
3.
DIRAC Experiment and Test of Low-Energy QCD / DIRAC Collaboration
The low-energy QCD predictions to be tested by the DIRAC experiment are revised. The experimental method, the setup characteristics and capabilities, along with first experimental results are reported. [...]
hep-ph/0001279; IFA-HEP-12-25; IFA-HEP-12-25; DIRAC-CONF-1999-06.- Bucharest : Romanian Committ. Nucl. Energy Inst. At. Phys., 2000 - 10 p. - Published in : , pp. 407-416
Access to fulltext document: PDF; Fulltext: PDF; External link: hep-ph/0001279 PDF
In : International Symposium on Advances in Nuclear Physics, Bucharest, Romania, 9 - 10 Dec 1999, pp.407
4.
Updated DIRAC spectrometer at CERN PS for the investigation of ππ and πK atoms / PS212 collaboration
The DIRAC spectrometer installed at CERN PS was redesigned and upgraded in order to study simultaneously Aππ and AπK atoms, namely the bound states of π+π–, and π+K–, π–K+ mesons. The detector system which is able to accept a high intensity beam such as 2 - 6 × 1011 primary protons per second, the electronics and the data-acquisition system adapted to handle very large amount of data actually allowed to identify successfully π, K, p, e and µ and to give the possibility to select π-π and π-K pairs in the off-line analysis. [...]
CERN-PH-EP-2015-147; DIRAC-PUB-2016-03.- Geneva : CERN, 2016 - 34 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 839 (2016) 52-85 Draft (restricted): PDF; Fulltext: PDF;
5.
Observation of πK+πK+ and π+Kπ+K atoms / DIRAC Collaboration
The observation of hydrogen-like πKπK atoms, consisting of πK+πK+ or π+Kπ+K mesons, is presented. The atoms have been produced by 24 GeV/cc 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
6.
Determination of ππππ scattering lengths from measurement of π+ππ+π atom lifetime / PS212 collaboration
The DIRAC experiment at CERN has achieved a sizeable production of π+ππ+π atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227 atomic pairs, a 4% measurement of the S-wave ππππ scattering length difference |a0a2|=(.0.2533+0.00800.0078|stat.+0.00780.0073|syst)M1π+|a0a2|=(.0.2533+0.00800.0078|stat.+0.00780.0073|syst)M1π+ has been attained, providing an important test of Chiral Perturbation Theory..
arXiv:1109.0569; CERN-PH-EP-2011-028; FERMILAB-PUB-10-713-E; DIRAC-PUB-2011-01.- Geneva : CERN, 2011 - 6 p. - Published in : Phys. Lett. B 704 (2011) 24-29 Draft (restricted): PDF; Fulltext: PDF; Preprint: PDF; External link: Preprint
7.
Evidence for πKπK-atoms with DIRAC / Adeva, B. (Santiago de Compostela U., IGFAE) ; Afanasyev, L. (Dubna, JINR) ; Allkofer, Y. (Zurich U.) ; Amsler, Claude (Zurich U.) ; Anania, A. (INFN, Messina ; Messina U.) ; Benelli, A. (Zurich U.) ; Brekhovskikh, V. (Serpukhov, IHEP) ; Caragheorgheopol, G. (Bucharest, IFIN-HH) ; Cechak, T. (Prague, Tech. U.) ; Chiba, M. (Tokyo Metropolitan U.) et al.
We present evidence for the first observation of electromagnetically bound π±Kπ±K-pairs (πKπK-atoms) with the DIRAC experiment at the CERN-PS. The πKπK-atoms are produced by the 24 GeV/c proton beam in a thin Pt-target and the π±π± and KK-mesons from the atom dissociation are analyzed in a two-arm magnetic spectrometer. [...]
arXiv:0905.0101; DIRAC-PUB-2009-01; DIRAC-PUB-2009-01.- 2009 - 6 p. - Published in : Phys. Lett. B 674 (2009) 11-16 Fulltext: arXiv:0905.0101 - PDF; 1-s2.0-S0370269309002433-main - PDF; External link: Preprint
8.
First observation of long-lived π+ππ+π atoms / DIRAC Collaboration
After observing and investigating the double-exotic π+ππ+π atom with the ground state lifetime ττ of about 3×10153×1015~s, the upgraded DIRAC experiment at the CERN PS accelerator observes for the first time long-lived states of the same atom with lifetimes of about 10111011~s and more. The number of characteristic pion pairs resulting from the breakup (ionisation) of long-lived π+ππ+π atoms amounts to 436±61436±61, corresponding to a signal-to-error ratio of better than 7 standard deviations. [...]
arXiv:1508.04712; CERN-PH-EP-2015-175; DIRAC-PUB-2015-02; CERN-PH-EP-2015-175.- Geneva : CERN, 2015-09-26 - 13 p. - Published in : Phys. Lett. B 751 (2015) 12-18 Article from SCOAP3: plb-751-12 - PDF; scoap3-fulltext - PDF; Fulltext: PDF; External link: Preprint
9.
First measurement of a long-lived π+ππ+π atom lifetime / DIRAC Collaboration
The adapted DIRAC experiment at the CERN PS accelerator observed for the first time long-lived hydrogen-like π+ππ+π 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;
10.
Measurement of the πKπK atom lifetime and the πKπK scattering length / DIRAC Collaboration
After having announced the statistically significant observation (5.6~σσ) of the new exotic πKπK atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, based on the full πKπK data sample: τ=(5.5+5.02.8)1015sτ=(5.5+5.02.8)1015s. By means of a precise relation (<1%<1%) between atom lifetime and scattering length, the following value for the S-wave isospin-odd πKπK scattering length a0 = 13(a1/2a3/2)a0 = 13(a1/2a3/2) has been derived: |a0|=(0.072+0.0310.020)M1πa0=(0.072+0.0310.020)M1π..
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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