Dr. Diana Laura Sirghi

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15Years (2012-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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4 April 2020 in Symmetry

Journal Article

Kaonic Atoms to Investigate Global Symmetry Breaking

+28

Kaonic atoms measure the antikaon-nucleus interaction at almost zero relative energy, allowing one to determine basic low-energy quantum chromodynamics (QCD) quantities, namely, the antikaon-nucleon (

\bar{K}

N) scattering lengths. The latter are important for extracting the sigma terms which are built on the symmetry breaking part of the Hamiltonian, thereby providing a measure of chiral and SU(3) symmetries breaking. After discussing the sigma terms and their relations to the kaonic atoms, we describe the most precise measurement in the literature of kaonic hydrogen, performed at LNF-INFN by the SIDDHARTA experiment. Kaonic deuterium is still to be measured, and two experiments are planned. The first, SIDDHARTA-2 at LNF-INFN was installed on DA

Φ

NE in spring 2019 and will collect data in 2020. The second, E57 at J-PARC, will become operative in 2021.

9 July 2018 in Entropy

Journal Article

On the Importance of Electron Diffusion in a Bulk-Matter Test of the Pauli Exclusion Principle

+20

The VIolation of Pauli (VIP) experiment (and its upgraded version, VIP-2) uses the Ramberg and Snow (RS) method (Phys. Lett. B 1990, 238, 438) to search for violations of the Pauli exclusion principle in the Gran Sasso underground laboratory. The RS method consists of feeding a copper conductor with a high direct current, so that the large number of newly-injected conduction electrons can interact with the copper atoms and possibly cascade electromagnetically to an already occupied atomic ground state if their wavefunction has the wrong symmetry with respect to the atomic electrons, emitting characteristic X-rays as they do so. In their original data analysis, RS considered a very simple path for each electron, which is sure to return a bound, albeit a very weak one, because it ignores the meandering random walks of the electrons as they move from the entrance to the exit of the copper sample. These complex walks bring the electrons close to many more atoms than in the RS calculation. Here, we consider the full description of these walks and show that this leads to a nontrivial and nonlinear X-ray emission rate. Finally, we obtain an improved bound, which sets much tighter constraints on the violation of the Pauli exclusion principle for electrons.

27 April 2022 in Symmetry

Journal Article

Testing the Pauli Exclusion Principle with the VIP-2 Experiment

+22

Violations of the Pauli Exclusion Principle (PEP), albeit small, could be motivated by physics beyond the Standard Model, ranging from violation of Lorentz invariance to extra space dimensions. This scenario can be experimentally constrained through dedicated, state-of-the-art X-ray spectroscopy, searching for a forbidden atomic transition from the L shell to the K shell already occupied by two electrons. The VIP-2 Experiment located at the underground Gran Sasso National Laboratories of INFN (Italy) tests PEP violations by introducing new electrons via a direct current in a copper conductor, measuring the X-ray energies through a silicon drift detector. Bayesian and frequentist analyses of approximately six months of data taken with the fully operational setup is presented, setting the strongest limit to date on the PEP violation shown by the VIP collaboration. The upper bound on PEP violation are placed at 90% CL

β^{2} / 2 \leq 6.8 \times 10^{- 42}

with the Bayesian approach, and

β^{2} / 2 \leq 7.1 \times 10^{- 42}

with the frequentist CL_s technique.

24 June 2017 in Entropy

Journal Article

Test of the Pauli Exclusion Principle in the VIP-2 Underground Experiment

+22

The validity of the Pauli exclusion principle—a building block of Quantum Mechanics—is tested for electrons. The VIP (violation of Pauli exclusion principle) and its follow-up VIP-2 experiments at the Laboratori Nazionali del Gran Sasso search for X-rays from copper atomic transitions that are prohibited by the Pauli exclusion principle. The candidate events—if they exist—originate from the transition of a

2 p

orbit electron to the ground state which is already occupied by two electrons. The present limit on the probability for Pauli exclusion principle violation for electrons set by the VIP experiment is

4.7 \times 10^{- 29}

. We report a first result from the VIP-2 experiment improving on the VIP limit, which solidifies the final goal of achieving a two orders of magnitude gain in the long run.

22 October 2020 in Entropy

Journal Article

VIP-2 —High-Sensitivity Tests on the Pauli Exclusion Principle for Electrons

+20

The VIP collaboration is performing high sensitivity tests of the Pauli Exclusion Principle for electrons in the extremely low cosmic background environment of the underground Gran Sasso National Laboratory INFN (Italy). In particular, the VIP-2 Open Systems experiment was conceived to put strong constraints on those Pauli Exclusion Principle violation models which respect the so-called Messiah–Greenberg superselection rule. The experimental technique consists of introducing a direct current in a copper conductor, and searching for the X-rays emission coming from a forbidden atomic transition from the L shell to the K shell of copper when the K shell is already occupied by two electrons. The analysis of the first three months of collected data (in 2018) is presented. The obtained result represents the best bound on the Pauli Exclusion Principle violation probability which fulfills the Messiah–Greenberg rule.

22 August 2023 in Sensors

Journal Article

Potentialities of CdZnTe Quasi-Hemispherical Detectors for Hard X-ray Spectroscopy of Kaonic Atoms at the DAΦNE Collider

+37

Kaonic atom X-ray spectroscopy is a consolidated technique for investigations on the physics of strong kaon–nucleus/nucleon interaction. Several experiments have been conducted regarding the measurement of soft X-ray emission (20 keV) from intermediate kaonic atoms (carbon, aluminum, and sulfur). In this context, we investigated cadmium–zinc–telluride (CdZnTe or CZT) detectors, which have recently demonstrated high-resolution capabilities for hard X-ray and gamma-ray detection. A demonstrator prototype based on a new cadmium–zinc–telluride quasi-hemispherical detector and custom digital pulse processing electronics was developed. The detector covered a detection area of 1 cm² with a single readout channel and interesting room-temperature performance with energy resolution of 4.4% (2.6 keV), 3% (3.7 keV), and 1.4% (9.3 keV) FWHM at 59.5, 122.1, and 662 keV, respectively. The results from X-ray measurements at the DAΦNE collider at the INFN National Laboratories of Frascati (Italy) are also presented with particular attention to the effects and rejection of electromagnetic and hadronic background.

About Me

Dr. Diana Laura Sirghi has worked at CREF as part of the “QUBO project–“Exploring the QUantum Boundaries of many-body systems–an Odyssey into the gravity-related collapse models” since 2022, where she carries out research activities dedicated to the development of advanced methods for energy calibration and data analysis for precision X-ray spectroscopy. In 1997, she started working at the Faculty of Physics of the University of Bucharest in the Department of Elementary Particles. Her earliest research concerned studying the kinematic conditions necessary to produce the baryon resonance Delta(1520) in electroproduction reactions. In 1992, following her win at a national competition at the National Institute of Nuclear Physics in Bucharest (IFIN-HH), she worked as a researcher in the Department of Particle Physics. From 2002 to 2022, she worked at the National Laboratories of Frascati, undertaking scientific activity dedicated to the study of exotic atoms within the international collaborations DEAR, SIDDHARTA and SIDDHARTA-2, and AMADEUS at the DAΦNE accelerator and the verification of the fundamental principles of physics as part of the international VIP and VIP-2 collaborations at the Gran Sasso National Laboratories. She was a member of the Management Board for the European projects (FP6, FP7) HadronPhysics/2/3 (2004-2014).

Dr. Diana Laura Sirghi

Dr. Diana Laura Sirghi

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