This webpage summarizes the blessed results for the observation of the orbitally excited (L = 1) B^**0 mesons in the fully reconstructed decay B^**0 → B⁺ π^- or in the decay B^**0 → B^+* π^- (B^+* → B⁺ γ), where we do not detect the γ.

The B⁺ mesons are fully reconstructed in three decay channels:
B⁺ → J/ψ K⁺ (J/ψ → μ⁺ μ^- ),
B⁺ → D⁰ π⁺ (D⁰ → K⁺ π^- ), and
B⁺ → D⁰ 3π⁺ (D⁰ → K⁺ π^- ).

The results have been produced for the summer conferences 2007 and have been blessed in the B Physcis Meeting on Thursday July 26, 2007.

We measure Q values ( m(B⁺ π^-) - m(B⁺) - m(π^-) ) of:

The resulting mass measurements of this analysis are:

A more detailed summary of the results can be found in this public note.

Below are all blessed figures for downloads.

• Figure 1 ( gif ): Transition diagram of B^** states
  
  
• Figure 2a ( gif ): Invariant mass distribution of B⁺ candidates m(K ⁺ J/ψ)
• Figure 2b ( gif ): Invariant mass distribution of B⁺ candidates m(D π ⁺)
• Figure 2c ( gif ): Invariant mass distribution of B⁺ candidates m(D 3π ⁺)
  
  

Bellow are plots with some more details showing data in separate B⁺ channels, with and without fit and NN output distribution to demonstrate separation between signal and background.

• Figure 3a ( gif ): The distribution of the Neural Network output for background(data) and signal(MC simulation) trained for B^**0 for the decay channel including B⁺ → J/ψ K⁺
• Figure 3b ( gif ): The distribution of the Neural Network output for background(data) and signal(MC simulation) trained for B^**0 for the decay channel including B⁺ → D π⁺
• Figure 3c ( gif ): The distribution of the Neural Network output for background(data) and signal(MC simulation) trained for B^**0 for the decay channel including B⁺ → D 3π⁺

  Plots with cut optimized on single channel

• Figure 4a ( gif ): Q value distribution of the B^**0 candidates with B⁺ → J/ψ K⁺ decay
• Figure 4b ( gif ): Q value distribution of the B^**0 candidates with B⁺ → D π⁺ decay
• Figure 4c ( gif ): Q value distribution of the B^**0 candidates with B⁺ → D 3π⁺ decay
• Figure 4d ( gif ): Q value distribution of the B^**0 candidates with all three B⁺ decays summed together

  Plots with cuts optimized in 3D scan over channels

• Figure 5a ( gif ): Q value distribution of the B^**0 candidates with B⁺ → J/ψ K⁺ decay
• Figure 5b ( gif ): Q value distribution of the B^**0 candidates with B⁺ → D π⁺ decay
• Figure 5c ( gif ): Q value distribution of the B^**0 candidates with B⁺ → D 3π⁺ decay
• Figure 5d ( gif ): Q value distribution of the B^**0 candidates with all three B⁺ decays summed together

  Fits to individual channels, optimized on a single channel

• Figure 6a ( gif ): Fit to Q value distribution of the B^**0 candidates with B⁺ → J/ψ K⁺ decay
• Figure 6b ( gif ): Fit to Q value distribution of the B^**0 candidates with B⁺ → D π⁺ decay
• Figure 6c ( gif ): Fit to Q value distribution of the B^**0 candidates with B⁺ → D 3π⁺ decay

  Final fit to combined channels

• Figure 7 ( gif ): Fit to the Q value distribution of the B^**0 candidates with all three B⁺ decays summed together using 3D scan over channels for optimal selection