Observation for a new $B_s^0 \pi^\pm$ state

V.M. Abazov; U. Bassler; G. Bernardi; M. Besançon; D. Brown; E. Chapon; F. Couderc; F. Deliot; Y. Enari; A. Faure; S. Greder; G. Grenier; A. Grohsjean; T. Kurca; P. Lebrun; J. Lellouch; D. Li; F. Miconi; V. Shary; M. Titov; B. Tuchming; D. Vilanova; L. Zivkovic; G. Sajot; J. Stark; M. Jaffré; J.-F. Grivaz; P. Pétroff; T. Guillemin; M.-C. Cousinou; A. Duperrin; W. Geng; E. Kajfasz; S. Kermiche; E. Nagy; N. Osman

doi:10.1103/PhysRevLett.117.022003

Journal articles

Observation for a new $B_s^0 \pi^\pm$ state

V.M. Abazov U. Bassler ¹ G. Bernardi ² M. Besançon ¹ D. Brown ² E. Chapon ³ F. Couderc ¹ F. Deliot ¹ Y. Enari ² A. Faure ¹ S. Greder ⁴ G. Grenier ⁵ A. Grohsjean ¹ T. Kurca ⁵ P. Lebrun ⁵ J. Lellouch ² D. Li ² F. Miconi ⁴ V. Shary ¹ M. Titov ¹ B. Tuchming ¹ D. Vilanova ¹ L. Zivkovic ² G. Sajot ⁶ J. Stark ⁶ M. Jaffré ⁷ J.-F. Grivaz ⁷ P. Pétroff ⁷ T. Guillemin ⁷ M.-C. Cousinou ⁸ A. Duperrin ⁸ W. Geng ⁸ E. Kajfasz ⁸ S. Kermiche ⁸ E. Nagy ⁸ N. Osman ⁸

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

2 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies

3 LLR - Laboratoire Leprince-Ringuet

4 IPHC - Institut Pluridisciplinaire Hubert Curien

5 IPNL - Institut de Physique Nucléaire de Lyon

6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

7 LAL - Laboratoire de l'Accélérateur Linéaire

8 CPPM - Centre de Physique des Particules de Marseille

Abstract : We report the observation of a narrow structure, $X(5568)$, in the decay sequence $X(5568) \rightarrow B_s^0 \pi^{\pm}$, $B_s^0 \rightarrow J/\psi \phi$, $J/\psi\rightarrow \mu^+ \mu^-$, $\phi \rightarrow K^+K^-$. This is the first observation of a hadronic state with valence quarks of four different flavors. The mass and natural width of the new state are measured to be $m = 5567.8 \pm 2.9 {\rm \thinspace (stat)} ^{+0.9}_{-1.9} {\rm \thinspace (syst)}$ MeV/$c^2$ and $\Gamma = 21.9 \pm 6.4 {\rm \thinspace (stat)} ^{+5.0}_{-2.5} {\rm \thinspace (syst)} $ MeV/$c^2$, and the significance including look-elsewhere effect and systematic uncertainties is 5.1$\sigma$. The observation is based on$10.4~\rm{fb^{-1}}$ of $p \overline p $ collision data at $\sqrt{s}$ = 1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider.

Document type :

Journal articles

Domain :

Physics [physics] / High Energy Physics - Experiment [hep-ex]

Physics [physics] / High Energy Physics - Phenomenology [hep-ph]

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Observation for a new $B_s^0 \pi^\pm$ state

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