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Hunting down the X17 boson at the CERN SPS | | E. Depero
; D. Banerjee
; J. Bernhard
; V. Burtsev
; A . Chumakov
; D. Cooke
; A. Dermenev
; S. Donskov
; R. Dusaev
; T. Enik
; N. Charitonidis
; A. Feshchenko
; V. Frolov
; A. Gardikiotis
; S. Gerassimov
; S. Girod
; S. Gninenko
; M. Hoesgen
; V. Kachanov
; A. Karneyeu
; G. Kekelidze
; B. Ketzer
; D. Kirpichnikov
; M. Kirsanov
; V. Kolosov
; I. Konorov
; S. Kovalenko
; V. Kramarenko
; L. Kravchuk
; N. Krasnikov
; S. Kuleshov
; V. Lyubovitskij
; V. Lysan
; V. Matveev
; Yu. Mikhailov
; L. Molina
; D. Peshekhonov
; V. Polyakov
; B. Radics
; R. Rojas
; A. Rubbia
; V. Samoylenko
; D. Shchukin
; V. Tikhomirov
; I. Tlisova
; D. Tlisov
; A. Toropin
; A. Trifonov
; B. Vasilishin
; G. Vasquez
; P. Volkov
; V. Volkov
; P. Ulloa
; P. Crivelli
; | | Date: |
6 Sep 2020 | | Abstract: | Recently, the ATOMKI experiment has reported new evidence for the excess of
$e^+ e^-$ events with a mass $sim$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 $X17$ boson. So far, the
search for the decay $X17
ightarrow e^+ e^-$ 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 $X17$ parameter space. If a signal-like event is detected, an
unambiguous observation is achieved by reconstructing the invariant mass of the
$X17$ decay with the proposed method. To reach this goal an optimization of the
$X17$ production target, as well as an efficient and accurate reconstruction of
two close decay tracks, is required. A dedicated analysis on the available
experimental data making use of the trackers information is presented. This
method provides an independent confirmation of the NA64 published results [D.
Banerjee {it et al.} (NA64 Collaboration), Phys. Rev. D101, 071101 (2020)],
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. | | Source: | arXiv, 2009.02756 | | Services: | Forum | Review | PDF | Favorites | |
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