Hunting down the X17 boson at the CERN SPS

© The Author(s) 2020..

Recently, the ATOMKI experiment has reported new evidence for the excess of e + e - events with a mass ∼ 17 MeV in the nuclear transitions of 4 He, that they previously observed in measurements with 8 Be. These observations could be explained by the existence of a new vector X 17 boson. So far, the search for the decay X 17 → e + e - 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 X 17 parameter space. If a signal-like event is detected, an unambiguous observation is achieved by reconstructing the invariant mass of the X 17 decay with the proposed method. To reach this goal an optimization of the X 17 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.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:80

Enthalten in:

The European physical journal. C, Particles and fields - 80(2020), 12 vom: 24., Seite 1159

Sprache:

Englisch

Beteiligte Personen:

NA64 Collaboration [VerfasserIn]
Depero, E [VerfasserIn]
Andreev, Yu M [VerfasserIn]
Banerjee, D [VerfasserIn]
Bernhard, J [VerfasserIn]
Burtsev, V E [VerfasserIn]
Charitonidis, N [VerfasserIn]
Chumakov, A G [VerfasserIn]
Cooke, D [VerfasserIn]
Crivelli, P [VerfasserIn]
Dermenev, A V [VerfasserIn]
Donskov, S V [VerfasserIn]
Dusaev, R R [VerfasserIn]
Enik, T [VerfasserIn]
Feshchenko, A [VerfasserIn]
Frolov, V N [VerfasserIn]
Gardikiotis, A [VerfasserIn]
Gerassimov, S G [VerfasserIn]
Girod, S [VerfasserIn]
Gninenko, S N [VerfasserIn]
Hösgen, M [VerfasserIn]
Kachanov, V A [VerfasserIn]
Karneyeu, A E [VerfasserIn]
Kekelidze, G [VerfasserIn]
Ketzer, B [VerfasserIn]
Kirpichnikov, D V [VerfasserIn]
Kirsanov, M M [VerfasserIn]
Kolosov, V N [VerfasserIn]
Konorov, I V [VerfasserIn]
Kovalenko, S G [VerfasserIn]
Kramarenko, V A [VerfasserIn]
Kravchuk, L V [VerfasserIn]
Krasnikov, N V [VerfasserIn]
Kuleshov, S V [VerfasserIn]
Lyubovitskij, V E [VerfasserIn]
Lysan, V [VerfasserIn]
Matveev, V A [VerfasserIn]
Mikhailov, Yu V [VerfasserIn]
Bueno, L Molina [VerfasserIn]
Peshekhonov, D V [VerfasserIn]
Polyakov, V A [VerfasserIn]
Radics, B [VerfasserIn]
Rojas, R [VerfasserIn]
Rubbia, A [VerfasserIn]
Samoylenko, V D [VerfasserIn]
Shchukin, D [VerfasserIn]
Sieber, H [VerfasserIn]
Tikhomirov, V O [VerfasserIn]
Tlisova, vI [VerfasserIn]
Tlisov, D A [VerfasserIn]
Toropin, A N [VerfasserIn]
Trifonov, A Yu [VerfasserIn]
Vasilishin, B I [VerfasserIn]
Arenas, G Vasquez [VerfasserIn]
Volkov, P V [VerfasserIn]
Volkov, V Yu [VerfasserIn]
Ulloa, P [VerfasserIn]

Links:

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Anmerkungen:

Date Revised 19.02.2022

published: Print-Electronic

Citation Status PubMed-not-MEDLINE

doi:

10.1140/epjc/s10052-020-08725-x

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM319080706