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Author(s)
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Volpe, R (Florence U. ; INFN, Florence ; Louvain U., CP3) ; Anzivino, G (Perugia U. ; INFN, Perugia) ; Aisa, D (Perugia U. ; INFN, Perugia) ; Barbanera, M (INFN, Perugia) ; Bizzarri, M (Perugia U. ; INFN, Perugia) ; Bizzeti, A (Florence U. ; INFN, Florence ; Modena U.) ; Brizioli, F (Perugia U. ; INFN, Perugia) ; Bucci, F (INFN, Florence) ; Campeggi, C (Perugia U. ; INFN, Perugia) ; Carassiti, V (INFN, Ferrara) ; Cassese, A (Florence U. ; INFN, Florence) ; Cenci, P (INFN, Perugia) ; Ciaranfi, R (INFN, Florence) ; Duk, V (INFN, Perugia) ; Iacopini, E (Florence U. ; INFN, Florence) ; Engelfried, J (San Luis Potosi U.) ; Estrada-Tristan, N (San Luis Potosi U.) ; Imbergamo, E (Perugia U. ; INFN, Perugia) ; Latino, G (Florence U. ; INFN, Florence) ; Lenti, M (Florence U. ; INFN, Florence) ; Lollini, R (Perugia U. ; INFN, Perugia) ; Maletta, F (INFN, Florence) ; Papi, A (INFN, Perugia) ; Pepe, M (INFN, Perugia) ; Piandani, R (Perugia U. ; INFN, Perugia) ; Piccini, M (INFN, Perugia) ; Piluso, A (Perugia U. ; INFN, Perugia) ; Scolieri, G (INFN, Perugia) |
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Abstract
| The NA62 experiment aims to measure the $BR$($K^+$ $\rightarrow$ $\pi^+$ $v$ $\overline{v}$) with a 10% precision. One of the main backgrounds comes from the decay $K^+$ $\rightarrow$ $\mu^+$ $v$ , therefore a highly powerful pion/muon separation is needed. The NA62 RICH, together with the calorimeter system, provides an accurate particle identification which has been essential to obtain the first results of the NA62 $K^+$ $\rightarrow$ $\pi^+$ $v$ $\overline{v}$ analysis, based on 2016 data. Two different algorithms have been exploited which, used in combination, allowed to get a pion reconstruction and identification efficiency of 75%, with a muon suppression factor of about 500, in the momentum range 15–35 GeV/c. |