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| Main Author: | |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.14005 |
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| _version_ | 1866909012177453056 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | A search for Standard Model Higgs bosons produced in association with a high-energy photon and decaying to $b\bar{b}$ is performed using 133 fb$^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collision data collected with the ATLAS detector at the Large Hadron Collider at CERN. The photon requirement reduces the multijet background, and the $H \rightarrow b\bar b$ decay is the dominant decay mode. Event selection requirements target events produced by vector-boson fusion, the dominant production mode in this channel. Several improvements enhance the search sensitivity compared to previous measurements. These improvements include better background modelling and characterization, the use of a neural-network classifier, and an updated signal extraction strategy adopting a direct binned-likelihood fit to the classifier output. With these improvements, the Higgs boson signal strength is measured to be $0.2 \pm 0.7$ relative to the Standard Model prediction. This corresponds to an observed significance of $0.3$ standard deviations, compared to an expectation of $1.5$ standard deviations assuming the Standard Model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_14005 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for Higgs bosons produced in association with a high-energy photon via vector-boson fusion and decaying to a pair of $b$-quarks in the ATLAS detector ATLAS Collaboration High Energy Physics - Experiment A search for Standard Model Higgs bosons produced in association with a high-energy photon and decaying to $b\bar{b}$ is performed using 133 fb$^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collision data collected with the ATLAS detector at the Large Hadron Collider at CERN. The photon requirement reduces the multijet background, and the $H \rightarrow b\bar b$ decay is the dominant decay mode. Event selection requirements target events produced by vector-boson fusion, the dominant production mode in this channel. Several improvements enhance the search sensitivity compared to previous measurements. These improvements include better background modelling and characterization, the use of a neural-network classifier, and an updated signal extraction strategy adopting a direct binned-likelihood fit to the classifier output. With these improvements, the Higgs boson signal strength is measured to be $0.2 \pm 0.7$ relative to the Standard Model prediction. This corresponds to an observed significance of $0.3$ standard deviations, compared to an expectation of $1.5$ standard deviations assuming the Standard Model. |
| title | Search for Higgs bosons produced in association with a high-energy photon via vector-boson fusion and decaying to a pair of $b$-quarks in the ATLAS detector |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2509.14005 |