2011-08-31 17:26 |
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2011-08-31 17:23 |
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2011-08-31 17:20 |
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2011-08-31 17:08 |
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2011-08-31 17:05 |
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2011-08-31 16:59 |
Preshower detector for π+π− hadronic atom studies
/ Pentia, M (Bucharest, IFIN-HH) ; Ciocarlan, C (Bucharest, IFIN-HH) ; Constantinescu, S (Bucharest, IFIN-HH) ; Gugiu, M (Bucharest, IFIN-HH) ; Caragheorgheopol, Gh (Bucharest, IFIN-HH)
DIRAC-PUB-2009-02.-
2009
- Published in : Nucl. Instrum. Methods Phys. Res., A 603 (2009) 309
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2011-08-31 16:55 |
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2011-08-31 14:13 |
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2011-02-28 17:12 |
Determination of $\pi\pi$ scattering lengths from measurement of $\pi^+\pi^-$ atom lifetime
/ PS212 collaboration
The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ 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 $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ has been attained, providing an important test of Chiral Perturbation Theory..
CERN-PH-EP-2011-028; FERMILAB-PUB-10-713-E; arXiv:1109.0569; DIRAC-PUB-2011-01.-
Geneva : CERN, 2011 - 6 p.
- Published in : Phys. Lett. B 704 (2011) 24-29
CERN-PH-EP-2011-028: PDF; Draft (restricted): PDF; Preprint: PDF; External link: Preprint
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2009-05-04 16:48 |
Evidence for $\pi K$-atoms with DIRAC
/ Adeva, B (Santiago de Compostela U., IGFAE) ; Afanasyev, L (Dubna, JINR) ; Allkofer, Y (Zurich U.) ; Amsler, C (Zurich U.) ; Anania, A (INFN, Messina) ; Benelli, A (Zurich U.) ; Brekhovskikh, V (Serpukhov, IHEP) ; Caragheorgheopol, G (Bucharest, IFIN-HH) ; Cechak, T (Andes U., Bogota) ; Chiba, M (Tokyo Metropolitan U.,) et al.
We present evidence for the first observation of electromagnetically bound $\pi^\pm K^\mp$-pairs ($\pi K$-atoms) with the DIRAC experiment at the CERN-PS. The $\pi K$-atoms are produced by the 24 GeV/c proton beam in a thin Pt-target and the $\pi^\pm$ and $K^\mp$-mesons from the atom dissociation are analyzed in a two-arm magnetic spectrometer. [...]
arXiv:0905.0101; DIRAC-PUB-2009-01.-
2009
- Published in : Phys. Lett. B 674 (2009) 11-16
External link: Preprint
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