CERN Accelerating science

Pàgina inicial > Resultats de la cerca: recid:1332520
Consells de cerca
Cerca avançada
Add to Search +
Cerca col·leccions:
Ordena'ls per: Mostrar els resultats: Format de visualizació:
CERN Document Server 2,050 registres trobats  1 - 10següentfinal  anar al registre: La cerca s'ha fet en 2.79 segons. 
1.
(100)
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
Registre complet - Registres semblants
2.
(91)
First observation of $\pi$K 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
Registre complet - Registres semblants
3.
(86)
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
Registre complet - Registres semblants
4.
(86)
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
Registre complet - Registres semblants
5.
(86)
Detection of $\pi^{+} \pi^{-}$ 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 $\pi^+\pi^-$ atom ($A_{2\pi}$), which is of order $3\times10^{-15}$ s, and thus to determine the s-wave $\pi\pi$-scattering lengths difference $|a_{0}-a_{2}|$. $A_{2\pi}$ atoms are detected through the characteristic features of $\pi^+\pi^-$ 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
Registre complet - Registres semblants
6.
(85)
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;
Registre complet - Registres semblants
7.
(82)
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;
Registre complet - Registres semblants
8.
(77)
Evidence for $\pi K$-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 $\pi^\pm K^\mp$-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; 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
Registre complet - Registres semblants
9.
(74)
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;
Registre complet - Registres semblants
10.
(65)
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
Registre complet - Registres semblants

No heu trobat el que estaveu cercant? Proveu la vostra cerca a:
recid:1332520 dins Amazon
recid:1332520 dins CERN EDMS
recid:1332520 dins CERN Intranet
recid:1332520 dins CiteSeer
recid:1332520 dins Google Books
recid:1332520 dins Google Scholar
recid:1332520 dins Google Web
recid:1332520 dins IEC		recid:1332520 dins IHS
recid:1332520 dins INSPIRE
recid:1332520 dins ISO
recid:1332520 dins KISS Books/Journals
recid:1332520 dins KISS Preprints
recid:1332520 dins NEBIS
recid:1332520 dins SLAC Library Catalog