2021-06-19 06:25 |
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2021-06-19 06:25 |
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2021-06-19 06:25 |
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2018-10-09 19:27 |
First measurement of a long-lived π+π− atom lifetime
/ DIRAC Collaboration
The adapted DIRAC experiment at the CERN PS accelerator observed for the first time long-lived hydrogen-like π+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;
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2017-06-13 09:51 |
Measurement of the πK atom lifetime and the πK scattering length
/ DIRAC Collaboration
After having announced the statistically significant observation (5.6~σ) of the new exotic πK atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, based on the full πK data sample: τ=(5.5+5.0−2.8)⋅10−15s. By means of a precise relation (<1%) between atom lifetime and scattering length, the following value for the S-wave isospin-odd πK scattering length a−0 = 13(a1/2−a3/2) has been derived: |a−0|=(0.072+0.031−0.020)M−1π..
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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2016-04-29 23:54 |
Observation of π−K+ and π+K− atoms
/ DIRAC Collaboration
The observation of hydrogen-like πK atoms, consisting of π−K+ or π+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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2015-08-20 08:01 |
First observation of long-lived π+π− atoms
/ DIRAC Collaboration
After observing and investigating the double-exotic π+π− atom with the ground state lifetime τ of about 3×10−15~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 10−11~s and more. The number of characteristic pion pairs resulting from the breakup (ionisation) of long-lived π+π− atoms amounts to 436±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
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2015-06-10 21:18 |
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;
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2014-08-20 07:34 |
New Preshower detector for DIRAC Experiment
/ Pentia, M. (Bucharest, IFIN-HH) ; Aogaki, S. (Bucharest, IFIN-HH) ; Dumitriu, D. (Bucharest, IFIN-HH) ; Fluerasu, D. (Bucharest, IFIN-HH) ; Gugiu, M. (Bucharest, IFIN-HH) ; Yazkov, V. (SINP, Moscow)
The Preshower (PSh) detector is a component of the DIRAC setup. It is designed to improve rejection efficiency of e-e+ pairs background in the {\pi}{\pi} and K{\pi} pair measurement. [...]
arXiv:1408.4246; DIRAC-PUB-2015-01.-
2015-09-21 - 6 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 795 (2015) 200-205
Fulltext: PDF; External link: Preprint
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2014-07-03 21:52 |
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