Search for doubly-charmed baryons in CDF data

Kuchibhotla, Adithya

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

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

Copyright and License Information

Copyright 2023 Adithya Kuchibhotla

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