Decay chain fitting with a Kalman filter

By W. Hulsbergen. 2005

637 citations recorded by the source corpus.

We present a method to perform a least-squares fit of a decay chain involving multiple decay vertices. Our technique allows for the simultaneous extraction of decay time, position and momentum parameters and their uncertainties and correlations for all particles in a decay chain.

Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics, Radiation

View Paper: https://www.semanticscholar.org/paper/135d2c36612f0a929a453242d079622cfb91fea8

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In Atomic and Molecular Physics, and Optics

In Nuclear and High Energy Physics

In Radiation

Citations in the corpus

Measurement of the $\Lambda_b^0$, $\Xi_b^-$ and $\Omega_b^-$ baryon masses (2013, background): “topology and vertices [12] while constraining the masses of the J/ψ , Λ, Ξ− and Ω− hadrons to have their known values [2], the final-state and intermediate long-lived particles to originate from common vertices according to the decay chain, and the b baryon to originate from the primary vertex.”
Observation of J/ψ-pair production in pp collisions at (2011, methodology): “A fit of the four-muon candidate is performed [26] that requires the four tracks to be consistent with originating from a common vertex and that this vertex is compatible with one of the reconstructed pp collision vertices.”
Measurement of CP asymmetry in D0 → K−K+ and D0 → π−π+ decays (2014, positive): “To improve the mass resolution, a vertex fit [17] of the D decay products is made,”
Observation of an exotic narrow doubly charmed tetraquark (2021, methodology): “For each DDπ candidate a kinematic fit [109] is performed.”
Observation of the Doubly Charmed Baryon Ξc c (2017, positive): “Ten input variables are used in the multivariate selector: the χ(2) per degree of freedom of each of the Λc vertex fit, the Ξ ++ cc vertex fit, and a kinematic refit [56] of the Ξ ++ cc decay chain requiring it to originate from its PV; the smallest pT of the three decay products of the Λc ; the sma”
Observation of X(3872) production in pp collisions at root s=7 TeV (2011, positive): “A vertex fit is performed [22] that constrains the four daughter particles to originate from a common point and the mass of the muon pair to the nominal J/ψ mass [23].”
Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in $\Lambda_b^0 \to J/\psi K^- p$ Decays (2015, methodology): “For subsequent analysis we constrain the J/ψK−p four-vectors to give the Λb invariant mass and the Λ 0 b momentum vector to be aligned with the measured direction from the primary to the Λb vertices [25].”