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Your search keyword '"PION-pion interactions"' showing total 113 results
Start Over Descriptor "PION-pion interactions" Topic hadrons
113 results on '"PION-pion interactions"'

1. Multi-hadron spectroscopy in a large physical volume.

Author

Bulava, John, Hörz, Ben, and Morningstar, Colin

Subjects
*QUARKS, *PION-pion interactions, *HADRONS, *ATOMIC mass, *LATTICE field theory, *LATTICE quantum chromodynamics
Abstract

We demonstrate the efficacy of the stochastic LapH method to treat all-to-all quark propagation on a Nf = 2 + 1 CLS ensemble with large linear spatial extent L = 5.5 fm, allowing us to obtain the benchmark elastic isovector p-wave pion-pion scattering amplitude to good precision already on a relatively small number of gauge configurations. These results hold promise for multi-hadron spectroscopy at close-to-physical pion mass with exponential finite-volume effects under control. [ABSTRACT FROM AUTHOR]

Published
2018
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30. Exclusive π0 electroproduction at W > 2 GeV with CLAS.

Subjects
*NEUTRAL pion, *MESONS, *HADRONS, *PION-pion interactions, SCATTERING
Abstract

The article discusses the study conducted which examines the exclusive neutral-pion electroproduction π0 electroproduction with a 5.75-Gigaelectron Volt electron beam and the Jefferson Lab (CEBAF) Large Acceptance Spectrometer (CLAS) detector. Topics discussed include inclusion of vector meson rescattering processes, hadrons and their interactions, and Pseudoscalar meson electroproduction.

Published
2014

31. Proton–proton, pion–proton and pion–pion diffractive collisions at ultrahigh energies.

Author

Anisovich, V. V., Nikonov, K. V., Nikonov, V. A., and Nyiri, J.

Subjects
*PROTON-proton interactions, *PION-proton inclusive interactions, *PION-pion interactions, *COLLISIONS (Nuclear physics), *NUCLEAR energy, *HADRONS, *EIKONAL equation
Abstract

The LHC energies are those at which the asymptotic regime in hadron–hadron diffractive collisions (pp, πp, ππ) might be switched on. Based on results of the Dakhno–Nikonov eikonal model which is a generalization of the Good–Walker eikonal approach for a continuous set of channels, we present a picture for transformation of the constituent quark mode to the black disk one. In the black disk mode (⎷s ≥ 10 TeV), we have a growth of the logarithm squared type for total and elastic cross-sections, σtot ~ ln2 s and σel ~ ln2 s and (τ = q⊥2 σtot)-scaling for diffractive scattering and diffractive dissociation of hadrons. The diffractive dissociation cross-section grows as σD ~ ln s, σDD ~ ln s, and their relative contribution tends to zero: σD/σtot → 0, σDD/σtot → 0. Asymptotic characteristics of diffractive and total cross-sections are universal, and this results in the asymptotical equality of cross-sections for all types of hadrons (the Gribov universality). The energy scale for switching on the asymptotic mode is estimated for different processes. [ABSTRACT FROM AUTHOR]

Published
2014
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39. Measurement of charged pions in 12C + 12C collisions at 1 A GeV and 2 A GeV with HADES.

Author

Agakishiev, G., Agodi, C., Balanda, A., Bellia, G., Belver, D., Belyaev, A., Bielcik, J., Blanco, A., A. Bortolotti9,, Boyard, J.L., Braun-Munzinger, P., Cabanelas, P., Chernenko, S., Christ, T., Coniglione, R., Destefanis, M., Díaz, J., Dohrmann, F., Durán, I., and Dybczak, A.

Subjects
*PION-pion interactions, *PION beams, *ION recombination, *ANISOTROPY, *HADRONS, *COLLISIONS (Nuclear physics)
Abstract

We present the results of a study of charged-pion production in 12C + 12C collisions at incident beam energies of 1A GeV and 2A GeV using the HADES spectrometer at GSI. The main emphasis of the HADES program is on the dielectron signal from the early phase of the collision. Here, however, we discuss the data with respect to the emission of charged hadrons, specifically the production of $ \pi^{{\pm}}_{}$ mesons, which are related to neutral pions representing a dominant contribution to the dielectron yield. We have performed the first large-angular-range measurement of the distribution of $ \pi^{{\pm}}_{}$ mesons for the 12C + 12C collision system covering a fairly large rapidity interval. The pion yields, transverse-mass and angular distributions are compared with calculations done within a transport model, as well as with existing data from other experiments. The anisotropy of pion production is systematically analyzed. [ABSTRACT FROM AUTHOR]

Published
2009
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40. Staggered weak matrix element miscellany

Author

Sharpe, S [California Univ., Santa Barbara, CA (USA). Inst. for Theoretical Physics Washington Univ., Seattle, WA (USA). Dept. of Physics]

Published
1990

41. Study of the decay with the KLOE detector

Author

Ambrosino, F., Antonelli, A., Antonelli, M., Bacci, C., Beltrame, P., Bencivenni, G., Bertolucci, S., Bini, C., Bloise, C., Bocci, V., Bossi, F., Bowring, D., Branchini, P., Caloi, R., Campana, P., Capon, G., Capussela, T., Ceradini, F., Chi, S., and Chiefari, G.

Subjects
*MASS (Physics), *HADRONS, *CENTER of mass, *PION-pion interactions
Abstract

Abstract: We measured, with the KLOE detector, the spectrum of invariant mass in a sample of events with the photon at large polar angle () at a centre of mass energy around the ϕ mass. We observe in this spectrum a clear contribution from the intermediate process . A sizeable effect is also observed in the distribution of the pion forward–backward asymmetry. We use different theoretical models to fit the spectrum and we determine the f0 mass and coupling constants to the ϕ, to and to . [Copyright &y& Elsevier]

Published
2006
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42. RECENT HERMES RESULTS ON MESON PRODUCTION.

Author

Tytgat, M.

Subjects
*PARTICLES (Nuclear physics), *HADRONS, *BARYONS, *NUCLEAR physics, *PION-pion interactions, *NUCLEAR reactions
Abstract

An overview is given of selected recent HERMES results involving hadron production. Topics including transversity, hard exclusive production of pion pairs, observation of the ϴ+ pentaquark state and quark fragmentation in nuclei will be presented. [ABSTRACT FROM AUTHOR]

Published
2005

43. Weinberg sum rules at finite temperature.

Author

Ayala, Alejandro, Dominguez, C. A., Loewe, M., and Zhang, Y.

Subjects
*QCD sum rules (Nuclear physics), *TEMPERATURE effect, *HADRONS, *PION-pion interactions, *SYMMETRY (Physics), *CHIRALITY of nuclear particles
Abstract

The saturation of the two Weinberg sum rules is studied at finite temperature, using recent independent QCD sum rule results for the thermal behavior of hadronic parameters in the vector and axial-vector channels. Both sum rules are very well satisfied from T = 0 up to T /Tc ≃ 0.7-0.8. At higher temperatures close to Tc a hadronic, pion-loop contribution in the spacelike region proportional to T2, present at leading order in the vector but not in the axial-vector channel, induces an asymmetry leading to a small deviation. In this region, though, QCD sum rules for the hadronic parameters begin to have no solutions, as the hadronic widths of the p and the a, mesons diverge signaling deconfinement. Close to and at T = Tc there are no pions left in the medium and chiral symmetry is restored, so that the sum rules are trivially satisfied. [ABSTRACT FROM AUTHOR]

Published
2014
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