ChPT test at NA48 and NA62 experiment at CERN

Roberto Piandani*, F. Ambrosino, A. Antonelli, G. Anzivino, R. Arcidiacono, W. Baldini, S. Balev, J. R. Batley, M. Behler, S. Bifani, C. Biino, A. Bizzeti, B. Bloch-Devaux, G. Bocquet, V. Bolotov, F. Bucci, N. Cabibbo, M. Calvetti, N. Cartiglia, A. CeccucciP. Cenci, C. Cerri, C. Cheshkov, J. B. Chèze, M. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, G. D'Agostini, P. Dalpiaz, C. Damiani, H. Danielsson, M. De Beer, G. Dellacasa, J. Derré, H. Dibon, D. Di Filippo, L. DiLella, N. Doble, V. Duk, J. Engelfried, K. Eppard, V. Falaleev, R. Fantechi, M. Fidecaro, L. Fiorini, M. Velasco, for the NA48/2 and NA62 Collaboration

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The new published measurements of the K±π± γγ decay with minimum bias data samples collected by the two experiments NA48/2 and NA62 are discussed. The results include a model independent decay rate measurement and fits to Chiral Perturbation Theory (ChPT) description. The model independent branching ratio in the kinematic range z = (mγγ/mK)2 > 0.2, obtained by combining the NA48/2 and NA62 results, is BMI = (0.965 ± 0.63) × 10-6. The combined branching ratio in the full kinematic range assuming a ChPT description is BChPT = (1.003±0.056)×10-6. The uncertainties are dominated by the statistical errors. The data support the ChPT prediction for a cusp in the di-photon invariant mass spectrum at the two pion threshold and are in agreement with both O(p4) and O(p6) ChPT predictions.

Original languageEnglish (US)
Pages (from-to)75-79
Number of pages5
JournalNuclear and Particle Physics Proceedings
StatePublished - 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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