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Search for Structure in the B_{s}^{0}π^{±} Invariant Mass Spectrum.

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This study searched for exotic meson states using LHCb data but found no significant evidence for the X(5568) state. Upper limits were established on its production rate and other potential exotic mesons decaying into B_s0 pi+/- final states.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Hadron Spectroscopy

Background:

  • Exotic mesons are particles not fitting the standard quark model.
  • The X(5568) state has been previously claimed but lacks confirmation.
  • Searches for exotic states are crucial for understanding fundamental particle interactions.

Purpose of the Study:

  • To investigate the B_s0 pi+/- invariant mass distribution for evidence of exotic meson states.
  • To search for the claimed X(5568) exotic meson state.
  • To set limits on the production rates of potential exotic mesons.

Main Methods:

  • Analysis of a large dataset of proton-proton collisions (3 fb^-1) collected by the LHCb detector at 7 and 8 TeV.
  • Examination of the invariant mass distribution of B_s0 pi+/- systems.
  • Statistical analysis to set upper limits on resonance production rates.

Main Results:

  • No significant excess was observed in the B_s0 pi+/- invariant mass spectrum.
  • Upper limits were placed on the production rate of the X(5568) state within the LHCb detector's acceptance.
  • Limits were also derived for hypothetical exotic mesons decaying via B_s0 pi+/- or B_s*0 pi+/- (with B_s*0 -> B_s0 gamma).

Conclusions:

  • The existence of the X(5568) state is not supported by this analysis.
  • The study provides stringent constraints on the presence of exotic mesons in the investigated mass region.
  • The results contribute to the ongoing search for new physics beyond the standard quark model.