literature
Literature
Authors
Jobs
Seminars
Conferences
DataBETA

Study of the Bc+→J/ψDs+B_c^+ \rightarrow J/\psi D_s^+ and Bc+→J/ψDs∗+B_c^+ \rightarrow J/\psi D_s^{*+} decays with the ATLAS detector

Collaboration
Jul 25, 2015
17 pages
Published in:
  • Eur.Phys.J.C 76 (2016) 1, 4
  • Published: Jan 5, 2016
e-Print:
DOI:
Report number:
  • CERN-PH-EP-2015-163
Experiments:
View in:
reference search64 citations

Citations per year

201520182021202420250246810
Abstract: (Springer)
The decays Bc+→J/ψDs+B_c^+ \rightarrow J/\psi D_s^+ and Bc+→J/ψDs∗+B_c^+ \rightarrow J/\psi D_s^{*+} are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb−1^{-1} of pp collisions collected at centre-of-mass energies s=7\sqrt{s} = 7 TeV and 8 TeV, respectively. Signal candidates are identified through J/ψ→μ+μ−J/\psi \rightarrow \mu ^+\mu ^- and Ds(∗)+→ϕπ+(γ/π0)D_s^{(*)+}\rightarrow \phi \pi ^+(\gamma /\pi ^0) decays. With a two-dimensional likelihood fit involving the Bc+B_c^+ reconstructed invariant mass and an angle between the μ+\mu ^+ and Ds+D_s^+ candidate momenta in the muon pair rest frame, the yields of Bc+→J/ψDs+B_c^+ \rightarrow J/\psi D_s^+ and Bc+→J/ψDs∗+B_c^+ \rightarrow J/\psi D_s^{*+} , and the transverse polarisation fraction in Bc+→J/ψDs∗+B_c^+ \rightarrow J/\psi D_s^{*+} decay are measured. The transverse polarisation fraction is determined to be Γ±±(Bc+→J/ψDs∗+)/Γ(Bc+→J/ψDs∗+)=0.38±0.23±0.07\Gamma _{\pm \pm }(B_c^+ \rightarrow J/\psi D_s^{*+})/\Gamma (B_c^+ \rightarrow J/\psi D_s^{*+}) = 0.38 \pm 0.23 \pm 0.07 , and the derived ratio of the branching fractions of the two modes is BBc+→J/ψDs∗+/BBc+→J/ψDs+=2.8 +1.2−0.8±0.3\mathcal {B}_{B_c^+ \rightarrow J/\psi D_s^{*+}}/\mathcal {B}_{B_c^+ \rightarrow J/\psi D_s^+} = 2.8 \,^{+1.2-0.8} \pm 0.3 , where the first error is statistical and the second is systematic. Finally, a sample of Bc+→J/ψπ+B_c^+\rightarrow J/\psi \pi ^+ decays is used to derive the ratios of branching fractions BBc+→J/ψDs+/BBc+→J/ψπ+=3.8±1.1±0.4±0.2\mathcal {B}_{B_c^+ \rightarrow J/\psi D_s^+}/\mathcal {B}_{B_c^+ \rightarrow J/\psi \pi ^+} = 3.8 \pm 1.1 \pm 0.4 \pm 0.2 and BBc+→J/ψDs∗+/BBc+→J/ψπ+=10.4±3.1±1.5±0.6\mathcal {B}_{B_c^+ \rightarrow J/\psi D_s^{*+}}/\mathcal {B}_{B_c^+ \rightarrow J/\psi \pi ^+} = 10.4 \pm 3.1 \pm 1.5 \pm 0.6 , where the third error corresponds to the uncertainty of the branching fraction of Ds+→ϕ(K+K−)π+D_s^+\rightarrow \phi (K^+K^-)\pi ^+ decay. The available theoretical predictions are generally consistent with the measurement.
Note:
  • p p: scattering
  • p p: colliding beams
  • B/c+: hadroproduction
  • B/c+: hadronic decay
  • J/psi(3100): leptonic decay
  • polarization: transverse
  • mass spectrum: (K+ K-)
  • mass spectrum: (K+ K- pi+)
  • B/c: branching ratio
  • branching ratio: ratio: measured
  • 1-25 of 28
  • 1
  • 2
  • 25 / page