Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · hep-ex/0312017

Design, Commissioning and Performance of the PIBETA Detector at PSI

E. Frlez·D. Pocanic·K. A. Assamagan·Yu. Bagaturia·V. A. Baranov·W. Bertl·Ch. Broennimann·M. A. Bychkov·J. F. Crawford·M. Daum·Th. Fluegel·R. Frosch·R. Horisberger·V. A. Kalinnikov·V. V. Karpukhin·N. V. Khomutov·J. E. Koglin·A. S. Korenchenko·S. M. Korenchenko·T. Kozlowski·B. Krause·N. P. Kravchuk·N. A. Kuchinsky·W. Li·D. W. Lawrence·R. C. Minehart·D. Mzhavia·H. Obermeier·D. Renker·B. G. Ritchie·S. Ritt·T. Sakhelashvili·R. Schnyder·V. V. Sidorkin·P. L. Slocum·L. C. Smith·N. Soic·W. A. Stephens·I. Supek·Z. Tsamalaidze·B. A. VanDevender·Y. Wang·H. -P. Wirtz·K. O. H. Ziock
View original source ↗Read source document ↗Export metadata ↓

Abstract

We describe the design, construction and performance of the PIBETA detector built for the precise measurement of the branching ratio of pion beta decay, pi+ -> pi0 e+ nu, at the Paul Scherrer Institute. The central part of the detector is a 240-module spherical pure CsI calorimeter covering 3*pi sr solid angle. The calorimeter is supplemented with an active collimator/beam degrader system, an active segmented plastic target, a pair of low-mass cylindrical wire chambers and a 20-element cylindrical plastic scintillator hodoscope. The whole detector system is housed inside a temperature-controlled lead brick enclosure which in turn is lined with cosmic muon plastic veto counters. Commissioning and calibration data were taken during two three-month beam periods in 1999/2000 with pi+ stopping rates between 1.3*E3 pi+/s and 1.3*E6 pi+/s. We examine the timing, energy and angular detector resolution for photons, positrons and protons in the energy range of 5-150 MeV, as well as the response of the detector to cosmic muons. We illustrate the detector signatures for the assorted rare pion and muon decays and their associated backgrounds.

Explore related subjects

hep-exphysics.ins-det

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

E. Frlez, D. Pocanic, K. A. Assamagan, Yu. Bagaturia, V. A. Baranov, W. Bertl, Ch. Broennimann, M. A. Bychkov, J. F. Crawford, M. Daum, Th. Fluegel, R. Frosch, R. Horisberger, V. A. Kalinnikov, V. V. Karpukhin, N. V. Khomutov, J. E. Koglin, A. S. Korenchenko, S. M. Korenchenko, T. Kozlowski, B. Krause, N. P. Kravchuk, N. A. Kuchinsky, W. Li, D. W. Lawrence, R. C. Minehart, D. Mzhavia, H. Obermeier, D. Renker, B. G. Ritchie, S. Ritt, T. Sakhelashvili, R. Schnyder, V. V. Sidorkin, P. L. Slocum, L. C. Smith, N. Soic, W. A. Stephens, I. Supek, Z. Tsamalaidze, B. A. VanDevender, Y. Wang, H. -P. Wirtz, K. O. H. Ziock. 2003-12-04. Design, Commissioning and Performance of the PIBETA Detector at PSI. https://doi.org/10.1016/j.nima.2004.03.137

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Feasibility Study of $e^+e^-\to η_cJ/ψ$ Production and Fully-Charmed Tetraquark Searches at STCF

The proposed high-luminosity Super Tau-Charm Facility (STCF) offers a clean experimental environment for threshold studies of exotic hadrons. In this Letter, we evaluate the expected significance for the fully-charmed vector tetraquark candidate $T_{4c}$ in the $e^+e^- \to η_c J/ψ$ channel at the STCF. Using Monte Carlo simulations of an energy scan from $\sqrt{s}=6.71$ to $6.79~\mathrm{GeV}$ with $100~\mathrm{fb}^{-1}$ per point, we adopt a high-efficiency single-tag (ST) reconstruction of $J/ψ$ leptonic decays as the primary strategy, with a double-tag (DT) reconstruction of $η_c \to K^+K^-π^0$ retained as an independent cross-check. Because the signal cross section is governed by the still-uncertain dielectron width $Γ_{ee}$, we consider three benchmark hypotheses, $Γ_{ee}=0.25, 0.5, 1~\mathrm{eV}$. The corresponding expected ST significances are $5.1\,σ$, $10.6\,σ$, and $20.5\,σ$, respectively. These results indicate that the STCF can provide meaningful sensitivity to fully-charmed tetraquark states near threshold.

hep-ex↗
arXiv2026

From Hits to Tracks: A BERT-based Tracking Model for Track Reconstruction in Drift Chambers

Track reconstruction in drift chambers is essential for momentum measurement and particle identification at electron-positron colliders. While Transformer architectures have transformed many sequence-processing domains, their application to tracking in high energy physics is still being explored. We present a model that combines a BERT encoder with a Transformer decoder to perform hit-to-track association through autoregressive sorting. The model is evaluated on the DCTracks open dataset that provides realistic drift chamber simulations with varying particle types, momenta, track multiplicities, and noise conditions. Across single-track, two-track, and multi-track samples, the model achieves high hit and track efficiencies while keeping the rates of clones and fakes very low. It also works well in the reconstruction of displaced vertices. These results show BERT-based sequence-to-sequence models as a promising approach for track reconstruction in low-background, precision-oriented experiments.

hep-ex↗
arXiv2026

Lowest-radiation environments in the Solar System: New opportunities for underground rare-event searches

We study neutrino, muon, and gamma-ray fluxes in extraterrestrial environments in our Solar System via semi-analytical estimates and Monte Carlo simulations. In sites with negligible atmosphere, we find a strong reduction in the cosmic-ray-induced neutrino and muon fluxes relative to their intensities on Earth. Neutrinos with energies between 50~MeV and 100~TeV show particularly strong suppression, by as much as 10$^3$, even at shallow depths. The solar neutrino suppression increases as the square of the site's distance from the Sun. Natural radiation due to nuclear decay is also expected to be lower in many of these locations and may be reduced to effectively negligible levels in liquid water environments. The sites satisfying these characteristics represent an opportunity for greatly extending the physics reach of underground searches in fundamental physics, such as searches for WIMP Dark Matter, neutrinoless double-beta decay, the diffuse supernova neutrinos, and neutrinos from nearby supernova. As a potential near-term target, we propose a measurement of muon and gamma-ray fluxes in an accessible underground lunar site such as the Mare Tranquillitatis Pit to perform a first measurement of the prompt component in cosmic-ray-induced particle production, and to constrain lunar evolution models. Although the focus of this work is on fundamental physics, the finding of this work -- that the existence of an atmosphere in a planet enhances cosmic-ray-induced radiation in its underground -- could be relevant for a broader range of sciences, such as radiobiology deep underground and searches for extraterrestrial life.

hep-ex↗