/ hep-ex CERN-PH-EP-2014-025

Study of the $K^\pm\to\pi^\pm\gamma\gamma$ decay by the NA62 experiment

Ceccucci, A. (CERN) ; Danielsson, H. (CERN) ; Falaleev, V. (CERN) ; Gatignon, L. (CERN) ; Goy Lopez, S. (CERN) ; Hallgren, B. (CERN) ; Maier, A. (CERN) ; Peters, A. (CERN) ; Piccini, M. (CERN) ; Riedler, P. (CERN) ; Frabetti, P.L. (Dubna, JINR) ; Gersabeck, E. (Dubna, JINR) ; Kekelidze, V. (Dubna, JINR) ; Madigozhin, D. (Dubna, JINR) ; Misheva, M. (Dubna, JINR) ; Molokanova, N. (Dubna, JINR) ; Movchan, S. (Dubna, JINR) ; Shkarovskiy, S. (Dubna, JINR) ; Zinchenko, A. (Dubna, JINR) ; Rubin, P. (George Mason U.) ; Baldini, W. (INFN, Ferrara) ; Cotta Ramusino, A. (INFN, Ferrara) ; Dalpiaz, P. (INFN, Ferrara) ; Fiorini, M. (INFN, Ferrara) ; Gianoli, A. (INFN, Ferrara) ; Norton, A. (INFN, Ferrara) ; Petrucci, F. (INFN, Ferrara) ; Savrie, M. (INFN, Ferrara) ; Wahl, H. (INFN, Ferrara) ; Bizzeti, A. (INFN, Florence) ; Bucci, F. (INFN, Florence) ; Iacopini, E. (INFN, Florence) ; Lenti, M. (INFN, Florence) ; Veltri, M. (INFN, Florence) ; Antonelli, A. (Frascati) ; Moulson, M. (Frascati) ; Raggi, M. (Frascati) ; Spadaro, T. (Frascati) ; Eppard, K. (Mainz U., Inst. Phys.) ; Hita-Hochgesand, M. (Mainz U., Inst. Phys.) ; Kleinknecht, K. (Mainz U., Inst. Phys.) ; Renk, B. (Mainz U., Inst. Phys.) ; Wanke, R. (Mainz U., Inst. Phys.) ; Winhart, A. (Mainz U., Inst. Phys.) ; Winston, R. (UC, Merced) ; Bolotov, V. (Moscow, INR) ; Duk, V. (Moscow, INR) ; Gushchin, E. (Moscow, INR) ; Ambrosino, F. (INFN, Naples) ; Di Filippo, D. (INFN, Naples) ; Massarotti, P. (INFN, Naples) ; Napolitano, M. (INFN, Naples) ; Palladino, V. (INFN, Naples) ; Saracino, G. (INFN, Naples) ; Anzivino, G. (INFN, Perugia) ; Imbergamo, E. (INFN, Perugia) ; Piandani, R. (INFN, Perugia) ; Sergi, A. (INFN, Perugia) ; Cenci, P. (INFN, Perugia) ; Pepe, M. (INFN, Perugia) ; Costantini, F. (INFN, Pisa) ; Doble, N. (INFN, Pisa) ; Giudici, S. (INFN, Pisa) ; Pierazzini, G. (INFN, Pisa) ; Sozzi, M. (INFN, Pisa) ; Venditti, S. (INFN, Pisa) ; Balev, S. (INFN, Pisa) ; Collazuol, G. (INFN, Pisa) ; Di, L. (INFN, Pisa) ; Gallorini, S. (INFN, Pisa) ; Goudzovski, E. (INFN, Pisa) ; Lamanna, G. (INFN, Pisa) ; Mannelli, I. (INFN, Pisa) ; Ruggiero, G. (INFN, Pisa) ; Cerri, C. (INFN, Pisa) ; Fantechi, R. (INFN, Pisa) ; Kholodenko, S. (Serpukhov, IHEP) ; Kurshetsov, V. (Serpukhov, IHEP) ; Obraztsov, V. (Serpukhov, IHEP) ; Semenov, V. (Serpukhov, IHEP) ; Yushchenko, O. (Serpukhov, IHEP) ; D'Agostini, G. (INFN, Rome) ; Leonardi, E. (INFN, Rome) ; Serra, M. (INFN, Rome) ; Valente, P. (INFN, Rome) ; Fucci, A. (INFN, Rome) ; Salamon, A. (INFN, Rome) ; Bloch-Devaux, B. (DAPNIA, Saclay) ; Peyaud, B. (DAPNIA, Saclay) ; Engelfried, J. (San Luis Potosi U.) ; Coward, D. (SLAC) ; Kozhuharov, V. (Sofiya U.) ; Litov, L. (Sofiya U.) ; Arcidiacono, R. (INFN, Turin) ; Bifani, S. (INFN, Turin) ; Biino, C. (INFN, Turin) ; Dellacasa, G. (INFN, Turin) ; Marchetto, F. (INFN, Turin) ; Numao, T. (TRIUMF) ; Retiere, F. (TRIUMF)

Abstract: A study of the dynamics of the rare decay $K^\pm\to\pi^\pm\gamma\gamma$ has been performed on a sample of 232 decay candidates, with an estimated background of $17.4\pm1.1$ events, collected by the NA62 experiment at CERN in 2007. The results are combined with those from a measurement conducted by the NA48/2 collaboration at CERN. The combined model-independent branching ratio in the kinematic range $z=(m_{\gamma\gamma}/m_K)^2>0.2$ is ${\cal B}_{\rm MI}(z>0.2) = (0.965 \pm 0.063) \times 10^{-6}$, and the combined branching ratio in the full kinematic range assuming a Chiral Perturbation Theory description is ${\cal B}(K_{\pi\gamma\gamma}) = (1.003 \pm 0.056) \times 10^{-6}$. A detailed comparison of the results with the previous measurements is performed.

Web-Page: http://inspirehep.net/record/1281684/files/eps_br-vs-c.png; http://inspirehep.net/record/1281684/files/eps_brmi-v1.png; http://inspirehep.net/record/1281684/files/eps_m2pi_07.png; http://inspirehep.net/record/1281684/files/eps_mpigg_07.png; http://inspirehep.net/record/1281684/files/eps_z_07.png; http://inspirehep.net/record/1281684/files/arXiv:1402.4334.pdf

Note: *Temporary entry*; Preprint submitted to Physics Letters B. arXiv admin note: text overlap with arXiv:1310.5499

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