Search for single vector-like B quark production in hadronic final states at the LHC
Abstract In this paper, we study the discovery potential of a Vector-Like B quark (VLB) via the process $$pp \rightarrow B(\rightarrow bZ)j\rightarrow b(Z \rightarrow \nu _l\bar{\nu _l})j$$ p p → B ( → b Z ) j → b ( Z → ν l ν l ¯ ) j at the Large Hadron Collider (LHC) with $$\sqrt{s}=14$$ s = 14 TeV...
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| Language: | English |
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SpringerOpen
2024-10-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-13482-2 |
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| author | Bingfang Yang Zejun Li Xinglong Jia Stefano Moretti Liangliang Shang |
| author_facet | Bingfang Yang Zejun Li Xinglong Jia Stefano Moretti Liangliang Shang |
| author_sort | Bingfang Yang |
| collection | DOAJ |
| description | Abstract In this paper, we study the discovery potential of a Vector-Like B quark (VLB) via the process $$pp \rightarrow B(\rightarrow bZ)j\rightarrow b(Z \rightarrow \nu _l\bar{\nu _l})j$$ p p → B ( → b Z ) j → b ( Z → ν l ν l ¯ ) j at the Large Hadron Collider (LHC) with $$\sqrt{s}=14$$ s = 14 TeV. In the framework of a simplified model, we perform a scan over its parameter space and test its viability following a Monte Carlo analysis developed to include all production and decay dynamics. We use cut-and-count combined with Extreme Gradient Boosting (XGBoost) methods to classify the signal and background events in order to improve the efficiency of signal identification and background rejection. We find that this approach can reduce background events significantly while the signal retention rate is much higher than that of traditional methods, thereby improving the VLB discovery potential. We then calculate the exclusion and discovery capabilities for VLBs and find that the advantages of the cut-and-count plus XGBoost method especially lie in the high-mass region, i.e., $$m_B > 1500 \text { GeV}$$ m B > 1500 GeV . We finally obtain the following LHC results in terms of the coupling and chiral structure of a singlet heavy VLB interactions: (i) for $$g^{*}=0.2$$ g ∗ = 0.2 and $$R_L=0$$ R L = 0 with 3000 fb $$^{-1}$$ - 1 , the B quark mass can be be excluded (discovered) up to 3000 GeV (2500 GeV); (ii) for $$g^{*}=0.2$$ g ∗ = 0.2 and $$R_L=0.5$$ R L = 0.5 with 3000 fb $$^{-1}$$ - 1 , the exclusion (discovery) region can reach up to 4750 GeV (4250 GeV). |
| format | Article |
| id | doaj-art-871e2baf08da44f38093134dc51eb102 |
| institution | OA Journals |
| issn | 1434-6052 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-871e2baf08da44f38093134dc51eb1022025-08-20T02:20:40ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-10-01841011310.1140/epjc/s10052-024-13482-2Search for single vector-like B quark production in hadronic final states at the LHCBingfang Yang0Zejun Li1Xinglong Jia2Stefano Moretti3Liangliang Shang4School of Physics, Henan Normal UniversitySchool of Physics, Henan Normal UniversitySchool of Physics, Henan Normal UniversityDepartment of Physics and Astronomy, Uppsala UniversitySchool of Physics, Henan Normal UniversityAbstract In this paper, we study the discovery potential of a Vector-Like B quark (VLB) via the process $$pp \rightarrow B(\rightarrow bZ)j\rightarrow b(Z \rightarrow \nu _l\bar{\nu _l})j$$ p p → B ( → b Z ) j → b ( Z → ν l ν l ¯ ) j at the Large Hadron Collider (LHC) with $$\sqrt{s}=14$$ s = 14 TeV. In the framework of a simplified model, we perform a scan over its parameter space and test its viability following a Monte Carlo analysis developed to include all production and decay dynamics. We use cut-and-count combined with Extreme Gradient Boosting (XGBoost) methods to classify the signal and background events in order to improve the efficiency of signal identification and background rejection. We find that this approach can reduce background events significantly while the signal retention rate is much higher than that of traditional methods, thereby improving the VLB discovery potential. We then calculate the exclusion and discovery capabilities for VLBs and find that the advantages of the cut-and-count plus XGBoost method especially lie in the high-mass region, i.e., $$m_B > 1500 \text { GeV}$$ m B > 1500 GeV . We finally obtain the following LHC results in terms of the coupling and chiral structure of a singlet heavy VLB interactions: (i) for $$g^{*}=0.2$$ g ∗ = 0.2 and $$R_L=0$$ R L = 0 with 3000 fb $$^{-1}$$ - 1 , the B quark mass can be be excluded (discovered) up to 3000 GeV (2500 GeV); (ii) for $$g^{*}=0.2$$ g ∗ = 0.2 and $$R_L=0.5$$ R L = 0.5 with 3000 fb $$^{-1}$$ - 1 , the exclusion (discovery) region can reach up to 4750 GeV (4250 GeV).https://doi.org/10.1140/epjc/s10052-024-13482-2 |
| spellingShingle | Bingfang Yang Zejun Li Xinglong Jia Stefano Moretti Liangliang Shang Search for single vector-like B quark production in hadronic final states at the LHC European Physical Journal C: Particles and Fields |
| title | Search for single vector-like B quark production in hadronic final states at the LHC |
| title_full | Search for single vector-like B quark production in hadronic final states at the LHC |
| title_fullStr | Search for single vector-like B quark production in hadronic final states at the LHC |
| title_full_unstemmed | Search for single vector-like B quark production in hadronic final states at the LHC |
| title_short | Search for single vector-like B quark production in hadronic final states at the LHC |
| title_sort | search for single vector like b quark production in hadronic final states at the lhc |
| url | https://doi.org/10.1140/epjc/s10052-024-13482-2 |
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