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1	Hunting down the X17 boson at the CERN SPS
	Depero, E.; Andreev, Yu. M.; Banerjee, D.; Bernhard, J.; Burtsev, V. E.; Charitonidis, N.; Chumakov, A. G.; Cooke, D.; Crivelli, P.; Dermenev, A. V.; Donskov, S. V.; Dusaev, R. R.; Enik, T.; Feshchenko, A.; Frolov, V. N.; Gardikiotis, A.; Gerassimov, S. G.; Girod, S.; Gninenko, S. N.; Hösgen, M.; Kachanov, V. A.; Karneyeu, A. E.; Kekelidze, G.; Ketzer, B.; Kirpichnikov, D. V.; Kirsanov, M. M.; Kolosov, V. N.; Konorov, I. V.; Kovalenko, S. G.; Kramarenko, V. A.; Kravchuk, L. V.; Krasnikov, N. V.; Kuleshov, S. V.; Lyubovitskij, V. E.; Lysan, V.; Matveev, V. A.; Mikhailov, Yu. V.; Bueno, L. Molina; Peshekhonov, D. V.; Polyakov, V. A.; Radics, B.; Rojas, R.; Rubbia, A.; Samoylenko, V. D.; Shchukin, D.; Sieber, H.; Tikhomirov, V. O.; Tlisova, vI.; Tlisov, D. A.; Toropin, A. N.; Trifonov, A. Yu.; Vasilishin, B. I.; Arenas, G. Vasquez; Volkov, P. V.; Volkov, V. Yu.; Ulloa, P.
	In: Eur Phys J C Part Fields (2020)
	Abstract: Recently, the ATOMKI experiment has reported new evidence for the excess of [Formula: see text] events with a mass [Formula: see text] 17 MeV in the nuclear transitions of [Formula: see text] He, that they previously observed in measurements with [Formula: see text] Be. These observations could be explained by the existence of a new vector [Formula: see text] boson. So far, the search for the decay [Formula: see text] with the NA64 experiment at the CERN SPS gave negative results. Here, we present a new technique that could be implemented in NA64 aiming to improve the sensitivity and to cover the remaining [Formula: see text] parameter space. If a signal-like event is detected, an unambiguous observation is achieved by reconstructing the invariant mass of the [Formula: see text] decay with the proposed method. To reach this goal an optimization of the [Formula: see text] production target, as well as an efficient and accurate reconstruction of two close decay tracks, is required. A dedicated analysis of the available experimental data making use of the trackers information is presented. This method provides independent confirmation of the NA64 published results [1], validating the tracking procedure. The detailed Monte Carlo study of the proposed setup and the background estimate show that the goal of the proposed search is feasible.
	Keyword: Regular Article - Experimental Physics
	URL: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7738366/ https://doi.org/10.1140/epjc/s10052-020-08725-x
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2	Observation of $Z$ production in proton-lead collisions at LHCb
	Aaij, R.; Adeva, B.; Adinolfi, M.. - 2014
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3	Observation of $Z$ production in proton-lead collisions at LHCb
	collaboration, L; Aaij, R; Adeva, B...
	In: Symplectic Elements at Oxford ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) ; Scopus (http://www.scopus.com/home.url) ; ArXiv (http://arxiv.org/) (2014)
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