نتایج جستجو برای: ππ interaction
تعداد نتایج: 566827 فیلتر نتایج به سال:
In this contribution, I summarise the studies of the properties of Bose-Einstein condensed systems composed of up to twelve pions or kaons carried out by the NPLQCD collaboration. These investigations have provided precise determination the I=2 ππ and I=1 KK scattering lengths and the first determination of three-hadron interactions from QCD, finding a repulsive threepion interaction of size co...
Probing the Nucleon’s Transversity Via Two-Meson Production in Polarized Nucleon-Nucleon Collisions∗
We explore the possibility of probing the nucleon’s transversity distribution δq(x) through the final state interaction between two mesons (ππ, πK, or KK) produced in transversely polarized nucleon-nucleon collisions. We present a single spin asymmetry and estimate its magnitude under some assumptions for the transversity distribution function and the unknown interference fragmentation function...
The molecular mechanism for removing the excess energy in DNA bases is responsible for the high photostability of DNA and is thus the subject of intense theoretical/computational investigation. To understand why the excited state decay of the stacked bases is significantly longer than that of the monomers, we carried out electronic structure calculations on an adenine monomer and an aqueous (dA...
We present a measurement of the branching ratio of the CP violating decay KL→ ππ performed by the KLOE experiment at the φ factory DAΦNE. We use 328 pb of data collected in 2001 and 2002, corresponding to ∼ 150 million tagged KL mesons. We find BR(KL → ππ) = (1.963 ± 0.012stat. ± 0.017syst.) × 10. This branching ratio measurement is fully inclusive of final-state radiation. Using the above resu...
We perform a detailed Regge analysis of NN , πN and ππ scattering. From it, we find expressions that represent the ππ scattering amplitudes with an accuracy of a few percent, for exchange of isospin zero, and ∼ 15% for exchange of isospin 1, and this for energies s > 1.4GeV and for momentum transfers |t| < ∼ 0.4GeV. These Regge formulas are perfectly compatible with the low energy (s ∼ 1.4GeV) ...
Low energy parameters of the KK and ππ scalar-isoscalar interactions Abstract Threshold expansions of the ππ and KK spin 0 and isospin 0 scattering amplitudes are performed. Scattering lengths, effective ranges and so–called volume parameters are evaluated. Good agreement with the existing experimental data for the ππ scalar–isoscalar amplitude is found. An importance of future accurate measure...
The phase variation of the σ → ππ amplitude is accurately determined as a function of mass from BES II data for J/Ψ → ωπ + π −. The determination arises from interference with the strong b 1 (1235)π amplitude. The observed phase variation agrees within errors with that in ππ elastic scattering. The σ pole appears as a conspicuous π + π − peak in BES II data for J/Ψ → ωπ + π − [1]. This peak is ...
Decays of baryon resonances in the second and the third resonance region into Nπ0π0 are studied by photoproduction of two neutral pions off protons. Partial decay widths of N and ∆ resonances decaying into ∆(1232)π, N(ππ)S ,N(1440)P11π, and N(1520)D13π are determined in a partial wave analysis of this data, and data from other reactions. Several partial decay widths were not known before. Inter...
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