The NA62 experiment aims to measure the BR(K+→π+νν̄) with a 10% precision. One of the main backgrounds comes from the decay K+→μ+ν, 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+→π+νν̄ 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.
The role of the NA62 RICH in the BR(K+→π+νν̄) measurement / Volpe, R., Anzivino, G., Aisa, D., Barbanera, M., Bizzarri, M., Bizzeti, A., Brizioli, F., Bucci, F., Campeggi, C., Carassiti, V., Cassese, A., Cenci, P., Ciaranfi, R., Duk, V., Iacopini, E., Engelfried, J., Estrada-Tristan, N., Imbergamo, E., Latino, G., Lenti, M., et al.. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - 952:(2020), pp. 161802-N/A. [10.1016/j.nima.2019.01.029]
The role of the NA62 RICH in the BR(K+→π+νν̄) measurement
Bizzeti A.;
2020
Abstract
The NA62 experiment aims to measure the BR(K+→π+νν̄) with a 10% precision. One of the main backgrounds comes from the decay K+→μ+ν, 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+→π+νν̄ 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.
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