University of Illinois Urbana-Champaign

Search for doubly-charmed baryons in CDF data

Kuchibhotla, Adithya

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https://hdl.handle.net/2142/121265

Description

Title
Search for doubly-charmed baryons in CDF data
Author(s)
Kuchibhotla, Adithya
Issue Date
2023-07-13
Director of Research (if dissertation) or Advisor (if thesis)
Pitts, Kevin
Doctoral Committee Chair(s)
Neubauer, Mark
Committee Member(s)
  • Cooper, Lance
  • Kahn, Yonatan
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Physics
  • Particle Physics
  • CDF
  • Baryons
  • Doubly-Charmed Baryons
  • Tevatron
Abstract
The production mechanisms of doubly-charmed baryons $\mathit{\Xi_{cc}^{+/++}}$ are not well understood. There is a strong motivation to validate the results of the detection of doubly-charmed baryons from experiments such as SELEX and LHCb, not only because the results from the two experiments are in conflict, but also to better understand the workings of Quantum Chromodynamics in their production. This work describes a search for doubly-charmed baryons in CDF Run II data, both in the six-track final state mode of $\mathit{\Xi_{cc}^{++}\rightarrow \Lambda_c^+K^-\pi^+\pi^+}$ and the five-track state of $\mathit{\Xi_{cc}^{+}\rightarrow \Lambda_c^+K^-\pi^+}$. The decay mode of another six-track final state $\mathit{\Lambda_{b}^{\mathrm{0}}\rightarrow \Lambda_c^+\pi^-\pi^+\pi^-}$ is used as a reference signal. The search was performed on the CDF data with selection criteria optimized for the $\mathit{\Lambda_{b}^{\mathrm{0}}\rightarrow \Lambda_c^+\pi^-\pi^+\pi^-}$ decay mode. The search did not result in a significant detection of either of the two doubly-charmed baryons. In the absence of a signal, an upper limit on the branching fraction ratio $\dfrac{\mathcal{B}(\mathit{\Xi_{cc}^{++}\rightarrow\Lambda_c^+ K^- \pi^+ \pi^+)}}{\mathcal{B}(\mathit{\Lambda_b^{\mathrm{0}}\rightarrow \Lambda_c^+ \pi^+ \pi^- \pi^-)}}\dfrac{\mathit{\sigma(\Xi_{cc}^{++})}}{\mathit{\sigma(\Lambda_b^{\mathrm{0}})}}$ is estimated as 24.18 (20.49) with 95\% (90\%) confidence level.
Graduation Semester
2023-08
Type of Resource
Thesis
Handle URL
https://hdl.handle.net/2142/121265
Copyright and License Information
Copyright 2023 Adithya Kuchibhotla

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