6533b7ddfe1ef96bd1273f82

RESEARCH PRODUCT

Reanalysis of pion pion phase shifts from K -> pi pi decays

Vincenzo CiriglianoGerhard F. EckerAntonio Pich

subject

Nuclear physicsPhysicsNuclear and High Energy PhysicsParticle physicsHigh Energy Physics - PhenomenologyPionScatteringIsospinPhase (waves)PiFísica

description

We re-investigate the impact of isospin violation for extracting the s-wave pion pion scattering phase shift difference delta_0(M_K) - delta_2(M_K) from K -> pi pi decays. Compared to our previous analysis in 2003, more precise experimental data and improved knowledge of low-energy constants are used. In addition, we employ a more robust data-driven method to obtain the phase shift difference delta_0(M_K) - delta_2(M_K) = (52.5 \pm 0.8_{exp} \pm 2.8_{theor}) degrees.

yearjournalcountryeditionlanguage
2009-01-01
10.1016/j.physletb.2009.08.027http://arxiv.org/abs/0907.1451