RT Dissertation/Thesis
T1 New approaches to the direct search of BSM physics with Codex-b and LHCb experiments
A1 López Soliño, Saúl
K1 Dark Matter
K1 LHCb
K1 Codex
AB This work presents studies in Beyond Standard Model Physics, using two different experiments, LHCb and future CODEX-b. Asearch for Dark Matter fromΛ𝑏 decays is performed within theLHCbexperiment during the LHC Run II at a center of mass energy of √ 𝑠 = 13 TeV. Two dark matter operators are studied, 𝒪𝑐𝑑( ¯ 𝑏 → 𝜓DM𝑐𝑑) and 𝒪𝑐𝑠( ¯ 𝑏 → 𝜓DM𝑐𝑠) with 0.940 GeV/c2 < 𝑚(𝜓DM) < 4.430 GeV/c2, respectively. The Λ𝑏 baryons originate in Σ(∗) 𝑏 decays. Λ𝑏 → 𝜓DM𝐾(𝐷 → 𝜋𝜋𝐾) and Λ𝑏 → 𝜓DM𝐾(𝐷 → 𝜋𝜋𝐾) are the final observed states. No signal is observed in any of the studied decay modes and the following upper limits are set for the first time: ℬ(𝒪𝑐𝑠( ¯ 𝑏 → 𝜓DM𝑐𝑠)) < 8.96 × 10−5 − 6.23 × 10−4 for 0.940 GeV/c2 < 𝑚(𝜓DM) < 3.0 GeV/c2 and ℬ(𝒪𝑐𝑑( ¯ 𝑏 → 𝜓DM𝑐𝑑)) < 2.45 × 10−4 − 8.25 × 10−5 for 0.940 GeV/c2 < 𝑚(𝜓DM) < 3.5 GeV/c2 at 95% CL. Within the CODEX-b, some studies for potential long lived particles searches are performed. A generator level efficiency for three different production modes (inclusive, Higgs-strahlung and weak-boson fusion) is computed in the framework of the CODEX-b experiment assuming a minimal Higgs portal model. These Higgs production modes are the dominant ones, while the Higgs portal decay models show a minimal decay model that would allow for future searches within the CODEX framework. This two experiments could also work together for collaborative searches, as showcased in this work.
YR 2024
FD 2024
LK https://hdl.handle.net/10347/38874
UL https://hdl.handle.net/10347/38874
LA eng
DS Minerva
RD 30 abr 2026