# On the production of $\pi^{+}_{}$$\pi^{+}_{} pairs in pp collisions at 0.8 GeV @article{ElSamad2009OnTP, title={On the production of \ \pi^\{+\}\_\{\}\\ \pi^\{+\}\_\{\}\ pairs in pp collisions at 0.8 GeV}, author={S. Abd El-Samad and R. Bilger and K. Brinkmann and H. Clement and M. Dietrich and E. Doroshkevich and S. Dshemuchadse and K. Ehrhardt and A. Erhardt and W. Eyrich and A. Filippi and H. Freiesleben and M. Fritsch and R. Geyer and A. Gillitzer and J. Hauffe and D. Hesselbarth and R. Jaekel and B. Jakob and L. Karsch and K. Kilian and J. Kress and E. Kuhlmann and S. Marcello and S. Marwinski and R. Meier and K. M{\"o}ller and H. Morsch and L. Naumann and J. Ritman and E. Roderburg and P. Sch{\"o}nmeier and M. Schulte-Wissermann and W. Schroeder and F. Stinzing and G. Sun and J. W{\"a}chter and G. Wagner and M. Wagner and U. Weidlich and A. Wilms and Stefan F. Wirth and G. Zhang and P. Żupr{\'a}nski and The COSY-TOF Collaboration}, journal={The European Physical Journal A}, year={2009}, volume={42}, pages={159-161} } Data accumulated recently for the exclusive measurement of the pp \rightarrowpp \pi^{+}_{}$$ \pi^{-}_{}$ reaction at a beam energy of 0.793GeV using the COSY-TOF spectrometer have been analyzed with respect to possible events from the pp$\rightarrow$nn$\pi^{+}_{}$$\pi^{+}_{} reaction channel. The latter is expected to be the only \pi$$ \pi$ production channel, which contains no major contributions from resonance excitation close to threshold and hence should be a good testing ground… Expand
15 Citations
Exclusive measurement of the pp → nnπ+π+ reaction at 1.1 GeV
First exclusive data for the $\ensuremath{pp \to nn\pi^+\pi^+}$ reaction have been obtained at CELSIUS with the WASA detector setup at a beam energy of Tp = 1.1 GeV. Total and differentialExpand
Isotensor Dibaryon in the pp→ppπ^{+}π^{-} Reaction?
Calculations describing these excitations by t-channel meson exchange are at variance with the measured differential cross sections and underpredict substantially the experimental total cross section. Expand
On a possible explanation of the DLS puzzle
• Physics
• 2014
The enhancement in the dilepton spectrum observed in heavy-ion collisions for invariant electron-positron masses in the range $$0.15 GeV < M_{e^ + e^ - } < 0.6 GeV$$ has recently been traced back toExpand
Examination of the production of an isotensor dibaryon in the pp→ppπ+π− reaction
The quasifree pp → ppπ+π− reaction has been measured by means of pd collisions at Tp = 1.2 GeV using the WASA detector setup at COSY enabling exclusive and kinematically complete measurements. TotalExpand
Two-pion production in nucleon–nucleon collisions—Back to dibaryons?
Abstract The two-pion production in nucleon–nucleon collisions has been investigated systematically by exclusive and kinematically complete measurements at CELSIUS/WASA and more recently at COSY-TOFExpand
Study of the quasi-free np → npπ + π − reaction with a deuterium beam at 1.25 GeV/nucleon
Abstract The tagged quasi-free np → np π + π − reaction has been studied experimentally with the High Acceptance Di-Electron Spectrometer (HADES) at GSI at a deuteron incident beam energy of 1.25Expand
Study of the reaction npπ → npπ+π− at 1.0 and 1.5 GeV
• Physics
• 2015
The np → npπ+π− reaction has been studied at the incident neutron energies of 1.0 GeV and 1.5 GeV in 4π-geometry using the neutron beam produced by the breakup of the relativistic deuterons at theExpand
The NUMEN project: NUclear Matrix Elements for Neutrinoless double beta decay
Abstract.The article describes the main achievements of the NUMEN project together with an updated and detailed overview of the related R&D activities and theoretical developments. NUMEN proposes anExpand
Phenomenological study on the p¯N→N¯Nππ reactions
• Physics
• 2010
Abstract We extend our recent phenomenological study of p N → N N π π reactions to the p ¯ N → N ¯ N π π reactions for anti-proton beam momenta up to 3.0 GeV within an effective Lagrangian approach.Expand
Dibaryons - a new state of matter?
• Physics
• 2014
New results in the field of dibaryons are discussed concentrating on the d ∗ (2380) resonance with I(J P ) = 0(3 + ), which has been observed first in the double- pionic fusion to deuterium andExpand

#### References

SHOWING 1-10 OF 13 REFERENCES
Single-pion production in pp collisions at 0.95 GeV/c (II)
The single-pion production reactions pp$\rightarrow$d$\pi^{+}_{}$ , pp$\rightarrow$np$\pi^{+}_{}$ and pp$\rightarrow$pp$\pi^{0}_{}$ were measured at a beam momentum of 0.95GeV/c ( Tp$\approx$Expand
p − p Interactions at 2 Bev. II. Multiple-Pion Production
• Physics
• 1962
Analyses have been made for 871 four-prong events and 463 two-prong events corresponding to multiple pion production, resulting from $p\ensuremath{-}p$ interactions at 2 Bev in the BNL 20-in.Expand
Single-pion production in pp collisions at 0.95 GeV/c (I)
Abstract.The single-pion production reactions pp → dπ+, pp → npπ+ and pp → ppπ0 were measured at a beam momentum of 0.95GeV/c ( Tp ≈ 400MeV) using the short version of the COSY-TOF spectrometer. TheExpand
Exclusive measurement of the pp --> pppi(+)pi(-) reaction near threshold.
The differential cross sections reveal pp-->pp(*)(1440)-->pp sigma = pp(pi(+)pi(-))(I = l = 0) as the dominant process as well as significant contributions from p(*)-->Delta(++)pi(-)-->psigma. Expand
Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions⋆
Abstract.In most investigations the Roper resonance is sensed only very indirectly via complex partial-wave analyses. We find indications for its excitation in the invariant nπ+ mass spectrum of theExpand
Two-pion production in proton-proton collisions with a polarized beam
The two-pion production reaction pp → ppπ+π− was measured with a polarized proton beam at Tp ≈ 750 and 800MeV using the short version of the COSY-TOF spectrometer. The implementation of aExpand
Theoretical study of the N N --> N N pi pi reaction
• Physics
• 1997
We have developed a model for the N N --> N N pi pi reaction and evaluated cross sections for the different charged channels. The low energy part of those channels where the pions can be in anExpand
Measurement of the pp cross sections in the momentum range 0.9–2.0 GeV/c
• Physics
• 1982
Abstract The pp total, elastic, and all the inelastic cross sections were measured at 11 momenta in the range 0.9–2.0 GeV/c. No clear structure was observed in their momentum dependences. TheExpand
Thepp→ppπ+π−reaction studied in the low-energy tail of the Roper resonance
Exclusive measurements of the p p -> p p pi+ pi- reaction have been carried out at Tp = 775 MeV at CELSIUS using the PROMICE/WASA setup. Together with data obtained at lower energy they point to aExpand
Two pion production in proton proton collisions near threshold at CELSIUS
Two-pion production reactions in proton-proton collisions near threshold are measured using an internal cluster-jet hydrogen target and the WASA/PROMICE detector at the CELSIUS storage ring. Four outExpand