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CERN Document Server 找到 2,038 笔记录  1 - 10下一个最後  跳到记录: 检索需时 0.51 秒. 
1.
(100)
Finite-size effects on $\pi^+\pi^-$ production in continuous and discrete spectrum / Lednicky, R (Prague, Inst. Phys.)
DIRAC-CONF-1999-05.- 1999
In : International Workshop on Hadronic Atoms, Bern, Switzerland, 14 - 15 Oct 1999, pp.7
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2.
(91)
Finite-size effects on two-particle production in continuous and discrete spectrum / Lednicky, R (JINR - ASCR)
DIRAC-NOTE-2004-06. - 2004.
Fulltext
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3.
(44)
On the separation $r^*$-distribution for pion-kaon pairs in the experiment DIRAC / Lednicky, R (Dubna, JINR ; Prague, Inst. Phys.)
DIRAC-NOTE-2012-05. - 2012. - 3 p.
Fulltext
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4.
(35)
Finite-size effects on two-particle production in continuous and discrete spectrum / Lednicky, R (CERN)
The effect of a finite space-time extent of particle production region on the lifetime measurement of hadronic atoms produced by a high energy beam in a thin target is discussed. [...]
nucl-th/0501065. - 2005. - 62 p.
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5.
(26)
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..
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
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6.
(26)
First observation of long-lived $\pi^+ \pi^-$ atoms / DIRAC Collaboration
After observing and investigating the double-exotic $\pi^+\pi^-$ atom with the ground state lifetime $\tau$ of about $3 \times 10^{-15}$~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 $\pi^+\pi^-$ atoms amounts to $436\pm61$, 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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7.
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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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8.
(24)
CP-violation and polarization effects in B-hadron decays / Sevelda, M
CERN-THESIS-2000-037 - Geneva : CERN, 2000. - 60 p.

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9.
(22)
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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10.
(21)
Closing speech / Niederle, J (Prague, Inst. Phys.)
CERN, 2008 Published version from CERN: PDF;
In : European School of High-Energy Physics, Trest, Czech Republic, 19 Aug - 1 Sep 2007, pp.309 (CERN-2008-007)
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