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Author  |
Caron, S.; Moskvitina, P.; Ruiz de Austri, R.; Shalugin, E. |
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Title |
Hits to Higgs: hit-level Higgs classification from raw LHC detector data using Higgsformer |
Type |
Journal Article |
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Year |
2026 |
Publication |
European Physical Journal C |
Abbreviated Journal |
Eur. Phys. J. C |
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Volume |
86 |
Issue |
7 |
Pages |
848 - 10pp |
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Abstract |
We present Higgsformer, a transformer-based architecture that classifies Higgs events at the Large Hadron Collider directly from raw inner tracker hits, bypassing the traditional reconstruction chain of intermediate physics objects. As a benchmark, we focus on distinguishing tt & strns;H from tt & strns; events with H -> bb & strns; , a particularly challenging task due to their similar final state topologies. Our pipeline begins with event generation in Pythia8, fast simulation with ACTS/Fatras, and classification directly from raw detector hits. We show for the first time that a transformer model originally developed for inner tracker hit-to-track assignment can be retrained to classify Higgs signal events directly from raw hits. For comparison, we reconstruct the same events with Delphes and train a Particle Transformer as an object-based classifier. We evaluate both approaches under varying dataset sizes and pileup levels. Despite relying exclusively on inner tracker hits, our large Higgsformer achieves an AUC of 0.855, matching the performance of the traditional reconstruction pipeline at a b-tagging efficiency of approximate to 40% under the same detector constraints. |
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Address |
[Caron, Sascha; Moskvitina, Polina; Shalugin, Eugene] Nikhef, Dutch Natl Inst Subatom Phys, Sci Pk 105, NL-1098 XG Amsterdam, Netherlands, Email: scaron@nikhef.nl; |
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Publisher |
Springer |
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Language |
English |
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Series Volume |
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Edition |
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ISSN |
1434-6044 |
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Notes |
WOS:001831861300006 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7351 |
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