L. Fabbri

Research summary

A K^-pp deeply bound kaonic state was extracted from FINUDA data at the DAPHNE phi-factory by reconstructing the Lambda-p two-body decay of stopped K^- absorption on thin nuclear targets, yielding a binding energy of 115 MeV and a width of 67 MeV from the invariant-mass distribution [1]. The SHiP proposal for the CERN SPS targets hidden particles below O(10) GeV/c^2 produced in 400 GeV proton interactions, including weakly interacting SUSY states, dark matter, and lepton-flavour-violating sources [2]. The SHiP sensitivity to Heavy Neutral Leptons was derived for HNLs originating in heavy-meson decays and travelling between 50 m and tens of kilometres, with benchmark coupling ranges relevant to neutrino-mass generation, baryogenesis, and dark-matter candidates [3]. The Large Volume Detector underground muon programme converted 21,804 hours of single- and multi-muon data into a depth-vertical intensity relation from 3 to 12 km w.e., extracting a primary all-nucleon power index gamma = 2.78 +/- 0.05 and a vertical muon spectrum at sea level [4]. A pentaquark search in 920 GeV pA collisions at HERA-B reported no narrow Theta+ (1540) or Xi^-- (1862) signals in 2x10^8 inelastic events and set upper limits on inclusive cross section times branching fraction well below model predictions, with B Xi^--/Xi(1530)^0 < 4% [5]. FINUDA also identified the neutron-rich hyperhydrogen ^6_Lambda H via coincident (pi+, pi-) pairs from K^-_stop + ^6Li -> ^6_Lambda H + pi+, with a production rate of 2.9x10^-6 per stopped K^- and a binding energy of 4.0 +/- 1.1 MeV relative to ^5H + Lambda [6]. The HERA-B kinematic study of J/psi production in p-C, p-Ti, and p-W at sqrt(s) = 41.6 GeV used 2.4x10^5 reconstructed J/psi mesons to extract a nuclear suppression parameter alpha = 0.981 +/- 0.015 and explore the negative-x_F region for the first time [7].

Recent publications

1. Evidence for a Kaon-Bound StateK−ppProduced inK−Absorption Reactions at Rest2005 · Physical Review Letters · 395 citationsDOI
2. A facility to Search for Hidden Particles (SHiP) at the CERN SPS2015 · arXiv (Cornell University) · 273 citationsDOI
3. Description and performance of the Fermilab E687 spectrometer1992 · Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · 134 citationsDOI
4. The most powerful scintillator supernovae detector: LVD1992 · Nuovo cimento della Società italiana di fisica. A, Nuclei, particles and fields · 122 citationsDOI
5. Sensitivity of the SHiP experiment to Heavy Neutral Leptons2019 · Journal of High Energy Physics · 116 citationsDOI
6. Muon “depth-intensity” relation measured by the LVD underground experiment and cosmic-ray muon spectrum at sea level1998 · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 104 citationsDOI
7. First results on 12ΛC production at DAΦNE2005 · Physics Letters B · 86 citationsDOI
8. Limits for the Central Production ofΘ+andΞ--Pentaquarks in 920-GeV pA Collisions2004 · Physical Review Letters · 75 citationsDOI
9. Evidence for Heavy HyperhydrogenHΛ62012 · Physical Review Letters · 75 citationsDOI
10. Kinematic distributions and nuclear effects of J/ψ production in 920 GeV fixed-target proton-nucleus collisions2009 · The European Physical Journal C · 72 citationsDOI

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External profiles

• ORCID: https://orcid.org/0000-0002-4002-8353
• OpenAlex: openalex.org

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