منابع مشابه
Determination of the S - wave ππ scattering lengths from a study of K ± → π ± π 0 π 0 decays
We report the results from a study of the full sample of ∼ 6.031 × 10 K → πππ decays recorded by the NA48/2 experiment at the CERN SPS. As first observed in this experiment, the ππ invariant mass (M00) distribution shows a cusp-like anomaly in the region around M00 = 2m+, where m+ is the charged pion mass. This anomaly has been interpreted as an effect due mainly to the final state charge excha...
متن کاملStudy of the doubly and singly Cabibbo suppressed decays D + → K + π + π − and D + s → K + π + π −
Using data collected by the high energy photoproduction experiment FOCUS at Fermilab we study the doubly and singly Cabibbo suppressed decays D and D s → K ππ. Our measurements of Γ(D → Kππ)/Γ(D → Kππ) = 0.0065 ± 0.0008 ± 0.0004 and Γ(D s → K ππ)/ Γ(D s → K Kπ) = 0.127 ± 0.007± 0.014 are based on samples of 189± 24 D and 567± 31 D s reconstructed events, respectively. We also present Dalitz plo...
متن کامل8 v 1 3 J ul 2 00 3 Phase Motion of the Scalar ππ Amplitudes in D + , D + s → π − π + π + Decays
We make a direct and model-independent measurement of the low π+π− mass phase motion in the D+ → π−π+π+ decay. Our preliminary results show a strong phase variation, compatible with the isoscalar σ(500) meson. This result confirms our previous result [1] where we found evidence for the existence of this scalar particle using full Dalitz-plot analysis. We apply the Amplitude Difference (AD) meth...
متن کاملSearch for D+(s)→π+μ+μ− and D+(s)→π−μ+μ+ decays
Article history: Received 24 April 2013 Received in revised form 3 June 2013 Accepted 4 June 2013 Available online 7 June 2013 Editor: L. Rolandi A search for non-resonant D(s) → π+μ+μ− and D(s) → π−μ+μ+ decays is performed using proton– proton collision data, corresponding to an integrated luminosity of 1.0 fb−1, at √ s = 7 TeV recorded by the LHCb experiment in 2011. No signals are observed a...
متن کاملThe Kπ and Ππ S-wave from D Decays
The physics of the scalar mesons has been challenging for decades. Scalar mesons are difficult to detect, since they decay isotropically and have, in general, large widths. There are many candidates with mass bellow 2 GeV/c. Some states are now well established, while others remain controversial. In any case, there is a large overlap between states in this region of the spectrum. An additional ...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2008
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-008-0581-y