The significance of final-state interactions inBd → ππ decays is quantitatively demonstrated by taking elastic ππ ⇀↽ ππ and inelastic ππ ⇀↽ DD̄ rescattering effects into consideration. We find that the present experimental data on B d → ππ can well be understood in this approach without fine-tuning of the input parameters, and large CP-violating asymmetries are expected to manifest themselves in...

The significance of final-state interactions in Bd → ππ decays is phenomenologically demonstrated by taking elastic ππ ⇀↽ ππ and inelastic ππ ⇀↽ DD̄ rescattering effects into consideration. We find that the present experimental data on B d → ππ can well be understood in this approach without fine-tuning of the input parameters, and large CP-violating asymmetries are expected to manifest themselv...

The ππ interactions are one of the main sources of information on low energy physics. Their knowledge in scalar-isoscalar channel allows us to investigate scalar meson spectroscopy and to test the predictions of many theoretical models. Amplitudes of the ππ interactions should fulfill some basic conditions like unitarity and crossing symmetry. Described in 1) three-coupled channel amplitudes fo...

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...

Recent reviews and predictions for this quantity in the Standard Model and earlier references are in . Here, we report on a calculation 3 of this quantity in the chiral limit and next-to-leading (NLO) order in 1/Nc. We also discuss the changes when the known chiral corrections -final state interactions (FSI) and π0 − η mixingare included. Direct CP-violation in the K → ππ decay amplitudes is pa...

The most recent calculations of π + π + and K + K + scattering by the NPLQCD collaboration using domain-wall valence quarks on staggered MILC configurations are presented. In addition, a quenched calculation of the potentials between two B-mesons is discussed.

Mayer's second cluster integral for the pion gas is calculated in quantum mechanical approach. It is shown that nonresonant repulsive ππ-interactions as well as the finite width of resonances yield important but almost canceling contributions at typical chemical freeze-out temperatures of the hadron gas. The repulsive ππ-interactions to the second cluster integral is identified with Van der Waa...

Strong final-state interactions create a pronounced cusp in η → ηππ decays. We adapt and generalize the non-relativistic effective field theory framework developed for the extraction of ππ scattering lengths from K → 3π decays to this case. The cusp effect is predicted to have an effect of more than 8% on the decay spectrum below the ππ threshold. PACS. 11.30.Rd Chiral symmetries – 13.25.Jx Dec...