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CERN Document Server 19 records found  1 - 10next  jump to record: Search took 0.59 seconds. 
1.
A new aerogel Cherenkov detector for DIRAC-II / Allkofer, Y (Zurich U.) ; Amsler, Claude (Zurich U.) ; Horikawa, S (Zurich U.) ; Regenfus, Christian (Zurich U.) ; Rochet, J (Zurich U.)
A new threshold Cherenkov detector using silica aerogel radiators is in operation in the DIRAC-II experiment at CERN. A duplex design was chosen to discriminate between kaons and protons in the momentum range 4-8 GeV/ c . [...]
DIRAC-PUB-2008-03.- 2008 - 4 p.

In : 6th International Workshop on Ring Imaging Cherenkov Counters, Trieste, Italy, 15 - 20 Oct 2007, pp.84-87
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2.
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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3.
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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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;
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5.
First $\pi K$ atom lifetime and $\pi K$ scattering length measurements / DIRAC Collaboration
The results of a search for hydrogen-like atoms consisting of $\pi^{\mp}K^{\pm}$ mesons are presented. Evidence for $\pi K$ atom production by 24 GeV/c protons from CERN PS interacting with a nickel target has been seen in terms of characteristic $\pi K$ pairs from their breakup in the same target ($178 \pm 49$) and from Coulomb final state interaction ($653 \pm 42$). [...]
arXiv:1403.0845; CERN-PH-EP-2014-030; DIRAC-PUB-2014-01; CERN-PH-EP-2014-030.- Geneva : CERN, 2014-07-30 - 7 p. - Published in : Phys. Lett. B 735 (2014) 288-294 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: PDF; Preprint: PDF;
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6.
Measuring the fall of antihydrogen: the AEgIS experiment at CERN / AEGIS Collaboration
2011 - Published in : Phys. Procedia 17 (2011) 49-56 Elsevier Open Access article: PDF;
In : 2nd International Workshop on the Physics of Fundamental Symmetries and Interactions, PSI, Villigen, Switzerland, 11 - 14 Oct 2010, pp.49-56
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7.
The C$_4$F$_{10}$ Cherenkov detector for DIRAC-II / Horikawa, S (Zurich U.) ; Allkofer, Y (Zurich U.) ; Amsler, C (Zurich U.) ; Brekhovskikh, V (Serpukhov, IHEP) ; Kuptsov, A (Dubna, JINR) ; Pentia, M (Bucharest, IFIN-HH) ; Ullaland, O (CERN) ; Zhabitsky, M (Dubna, JINR) /DIRAC Collaboration
A new threshold Cherenkov detector using C$_4$F$_{10}$ gas radiator was built and put into operation in the DIRAC-II experiment at CERN. Running on the C$_4$F$_{10}$ at room temperature and atmospheric pressure, the detector discriminates between pions and kaons in the momentum range of 4–8GeV/$c$. [...]
DIRAC-CONF-2007-04; DIRAC-PUB-2008-04.- 2008 - Published in : Nucl. Instrum. Methods Phys. Res., A 595 (2008) 212-215
In : 6th International Workshop on Ring Imaging Cherenkov Counters, Trieste, Italy, 15 - 20 Oct 2007, pp.212-215
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8.
Search for $\pi$K atoms with DIRAC-II / Allkofer, Y (Zurich U.) ; Amsler, C (Zurich U. ) ; Horikawa, S (Zurich U.) ; Regenfus, C (Zurich U.) ; Rochet, J (Zurich U.)
DIRAC-CONF-2007-03. - 2007.
Fulltext
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9.
A novel aerogel Cherenkov detector for DIRAC-II / Allkofer, Y (Zurich U.) ; Amsler, C (Zurich U.) ; Horikawa, S (Zurich U.) ; Johnson, I (Zurich U.) ; Regenfus, C (Zurich U.) ; Rochet, J (Zurich U.)
We present a new threshold Cherenkov detector using silica aerogel radiators with wavelength shifter. A duplex design was chosen to discriminate between kaons and protons in the momentum range 4–8 GeV/c for the DIRAC-II experiment at CERN. [...]
DIRAC-PUB-2007-01.- 2007 - 12 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 582 (2007) 497
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10.
Tracking in DIRAC using only downstream detectors / Allkofer, Y (Zurich U.) ; Benelli, A (Basel U.) ; Tauscher, L (Basel U.)
DIRAC-NOTE-2007-08. - 2007.
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12 Allkofer, Y
1 Allkofer, Yves
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