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DIRAC Conference Proceedings

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2021-06-23
06:01
Investigation of $\pi^+\pi^-, K^+\pi^-$ and $\pi^+K^-$ atoms for pion-pion and pion-kaon scattering length measurements / Yazkov, Valeriy (SINP, Moscow) /DIRAC Collaboration
Theory, using Low Energy QCD, calculated with high precision the $\pi\pi$ and $\pi K$ scattering length. Lifetime of $\pi^+\pi^−$ atoms are related with a difference of pion-pion s-wave scattering lengths with isospin 0 and 2: $|a_0 − a_2|$ [...]
DIRAC-CONF-2015-01.- 2015 - 6 p. External link: Fulltext
In : The XXII International Workshop High Energy Physics and Quantum Field Theory, Samara, Russia, 24 Jun - 1 Jul 2015

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2021-06-22
06:00
First $nK$ atom lifetime measurement and recent results from the DIRAC experiment / Zhabitsky, Mikhail (Dubna, JINR) /DIRAC Collaboration
We report evidence for $\pi K$ atoms production, using 24 GeV/c proton beam from CERN PS interacting with a thin Ni target. We have identified $(178 \pm 49) \pi K$ pairs, which were produced in a bound state - $\pi K$ atom, which was subsequently broken-up (ionized) in the Ni target. [...]
DIRAC-CONF-2014-01.- 2014 - 6 p. - Published in : EPJ Web Conf. 81 (2014) 01019 Fulltext: PDF;
In : 13th International Workshop on Meson Production, Properties and Interaction, Cracow, Poland, 29 May - 3 Jun 2014, pp.01019

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2017-10-08
06:00
First observation of $\pi^{-}K^+$ and $\pi^{+}K^-$ atoms, their lifetime measurement and $\pi K$ scattering lengths evaluation / Afanasyev, Leonid (Dubna, JINR) /DIRAC Collaboration
The Low Energy QCD allows to calculate the ππ and π K scattering lengths with high precision. There are accurate relations between these scattering lengths and π + π − , π − K + , π + K − atoms lifetimes. [...]
DIRAC-CONF-2016-02.- SISSA, 2016 - 6 p. - Published in : PoS ICHEP2016 (2016) 637 Fulltext: PDF; External link: PoS server
In : 38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016, pp.637

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2017-08-10
06:48
The investigation of $K^+\pi^−, \pi^+K^−$ and $\pi^+\pi^−$ atoms / Yazkov, Valeriy (SINP, Moscow)
Theory, using Low Energy QCD, predicts with high precision the pion-pion and pion-kaon scattering lengths. There is accurate relation between $K^+\pi^−$ and $\pi^+K^-$ atoms lifetime and pion-kaon S-wave scattering lengths with isospin 1/2 and 3/2. [...]
DIRAC-CONF-2016-01.- 2016 - 6 p. - Published in : EPJ Web Conf. 130 (2016) 01015
In : 14th International Workshop on Meson Production, Properties and Interaction, Krakow, Poland, 2 - 7 Jun 2016, pp.01015

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2017-06-21
07:22
Last results of DIRAC experiment on study hadronic hydrogen-like atoms at PS CERN / Afanasyev, Leonid (Dubna, JINR)
Results on study the hydrogen-like atoms consisting of charged pions and Kaons are presented. The first measurement of K+π and Kπ+ atoms lifetime was fulfilled basing on identification of 178±49Kπ pairs from the atom breakup. [...]
DIRAC-CONF-2014-02.- 2016 - 6 p. - Published in : Nucl. Part. Phys. Proc. 273-275 (2016) 1997-2002 Fulltext: PDF;
In : 37th International Conference on High Energy Physics, Valencia, Spain, 2 - 9 Jul 2014, pp.1997-2002

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2012-09-03
16:17
DIRAC experiment at CERN / Benelli, Angela (Dubna, JINR ; Zurich U.) /DIRAC collaboration
The precise measurements of $\pi^+\pi^-$ and $\pi K$ atom lifetime allow to check the predictions of Chiral Perturbation Theory for the pion-pion s-wave scattering lengths with isospin 0 and 2 and for the pion-kaon scattering lengths with isospin 1/2 and 3/2. The DIRAC experiment with the latest results is presented together with the proposal for future investigations..
DIRAC-CONF-2012-01.- 2012 - 6 p. - Published in : EPJ Web Conf. 37 (2012) 01011 Fulltext: PDF; Preprint: PDF;
In : 12th International Workshop on Meson Production, Properties and Interaction, Krakow, Poland, 31 May - 5 Jun 2012, pp.01011

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2011-09-06
10:20
Investigation of $\pi^+ \pi^-$ and $pi$K atoms at DIRAC / Yazkov, Valeriy (SINP, Moscow) /DIRAC Collaboration
Measurement of $π^+π^−$ and $πK$ atom lifetimes allows to check prediction of Chiral Perturbation Theory for pion-pion scattering lengths with isospin 0 and 2, and pion-kaon scattering lengths with isospin 1/2 and 3/2. Current status of DIRAC experiment, expected results and proposal for future investigations are presented..
DIRAC-CONF-2009-02.- 2009 - Published in : PoS: CD09 (2009) , pp. 003 Published version from PoS: PDF;
In : 6th International Workshop on Chiral Dynamics, Bern, Switzerland, 6 - 10 Jul 2009, pp.003

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2011-09-06
10:14
Evidence for $\pi$K atoms with DIRAC / Benelli, A (CERN ; Zurich U.) /DIRAC-II Collaboration
Electromagnetically bound $π^{\pm}K^{\mp}$-pairs ($πK$-atoms) have been observed by the DIRAC-II experiment at the CERN-PS. The $πK$-atoms were produced by the 24 GeV/c proton beam impinging on a thin Pt-target. [...]
DIRAC-CONF-2009-01.- 2009 - Published in : PoS: CD09 (2009) , pp. 008 Published version from PoS: PDF;
In : 6th International Workshop on Chiral Dynamics, Bern, Switzerland, 6 - 10 Jul 2009, pp.008

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2011-09-06
09:54
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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2011-09-06
09:45
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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