Monte Carlo study of extending the BM@N tracking acceptance toward midrapidity with the Vertex Silicon Plane
Abstract
The Vertex Silicon Plane (VSP), installed close to the target in BM@N Run 9, can extend the tracking acceptance of the central tracking system toward larger polar angles. Using Monte Carlo simulations of Xe+Sn collisions at 3 AGeV, we reconstruct short tracklets from the primary vertex, one VSP hit, and hits in the first two Gas Electron Multiplier (GEM) stations. These tracklets extend the reconstructed primary-proton coverage toward midrapidity and higher transverse momenta. For the 10-30% centrality interval of the independent validation dataset, the conditional reconstruction efficiency for reconstructible high-pT primary protons after BDT selection is 67.0%, while the tracklet purity reaches 86.5%. For pT>1.2 GeV/c, the VSP-assisted tracklets increase the number of reconstructed primary protons by 17.5% relative to standard BM@N tracking. Of these additional protons, 84.6% lie within |y|<0.3, where the relative reconstruction gain reaches 45.5%. The added acceptance is concentrated in the high-pT, near-midrapidity region relevant for identified-proton observables. Its use in data requires particle identification in the same region.
Related
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- In situ performance of the Vertex Silicon Plane in the BM@N experiment during Run 9
- Midrapidity dip and limiting fragmentation of charged hadrons from RHIC to LHC energies
- Extending the Similarity Spectrum to the SWIR for quality control of above water reflectance measurements
BibTeX
@misc{dementev2026monte,
title = {{Monte Carlo study of extending the BM@N tracking acceptance toward midrapidity with the Vertex Silicon Plane}},
author = {D. Dementev and D. Baranov and V. Leontyev and Yu. Murin and I. Rufanov},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29705},
eprint = {2610.29705},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29705},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Monte Carlo study of extending the BM@N tracking acceptance toward midrapidity with the Vertex Silicon Plane
AU - D. Dementev
AU - D. Baranov
AU - V. Leontyev
AU - Yu. Murin
AU - I. Rufanov
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29705
UR - https://arxiv.org/abs/2610.29705
AB - The Vertex Silicon Plane (VSP), installed close to the target in BM@N Run 9, can extend the tracking acceptance of the central tracking system toward larger polar angles. Using Monte Carlo simulations of Xe+Sn collisions at 3 AGeV, we reconstruct short tracklets from the primary vertex, one VSP hit, and hits in the first two Gas Electron Multiplier (GEM) stations. These tracklets extend the reconstructed primary-proton coverage toward midrapidity and higher transverse momenta. For the 10-30% centrality interval of the independent validation dataset, the conditional reconstruction efficiency for reconstructible high-p_T primary protons after BDT selection is 67.0%, while the tracklet purity reaches 86.5%. For p_T>1.2 GeV/c, the VSP-assisted tracklets increase the number of reconstructed primary protons by 17.5% relative to standard BM@N tracking. Of these additional protons, 84.6% lie within |y|<0.3, where the relative reconstruction gain reaches 45.5%. The added acceptance is concentrated in the high-p_T, near-midrapidity region relevant for identified-proton observables. Its use in data requires particle identification in the same region.
ER -