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Hunting down the X17 boson at the CERN SPS.

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Researchers propose a new method for the NA64 experiment to detect a hypothetical new vector boson. This technique aims to improve sensitivity and confirm previous findings by reconstructing the invariant mass of particle decays.

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Area of Science:

  • Particle Physics
  • Nuclear Physics
  • Experimental Physics

Background:

  • The ATOMKI experiment reported an excess of events suggesting a new vector boson with a mass of approximately 17 MeV.
  • Previous searches for this particle's decay by the NA64 experiment at CERN yielded null results.
  • Existing data from He and Be nuclear transitions provide potential evidence for this new boson.

Purpose of the Study:

  • To introduce a novel technique for the NA64 experiment to enhance the search sensitivity for the proposed vector boson.
  • To validate a method for reconstructing the invariant mass of the decay, enabling unambiguous signal detection.
  • To cover the unexplored parameter space in the search for this new particle.

Main Methods:

  • Development and optimization of a new production target for the hypothetical vector boson.
  • Implementation of an efficient and accurate reconstruction algorithm for two-track decays using tracker information.
  • Analysis of existing experimental data and Monte Carlo simulations to validate the proposed tracking procedure and estimate background.

Main Results:

  • A dedicated analysis of available experimental data confirms the validity of the tracking procedure used by NA64.
  • Monte Carlo simulations demonstrate the feasibility of the proposed experimental setup for detecting the signal.
  • The study provides an independent confirmation of the NA64 published results.

Conclusions:

  • The proposed technique offers a viable path to improve the sensitivity of the NA64 experiment.
  • Successful implementation could lead to the unambiguous observation of the hypothesized vector boson.
  • The study validates the tracking methodology and confirms the feasibility of the proposed search strategy.