E. Luppi
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View article: Investigation of the burst phenomenon in SiPMs in liquid nitrogen
Investigation of the burst phenomenon in SiPMs in liquid nitrogen Open
Burst effect of Silicon Photomultiplier (SiPM) at cryogenic temperatures have been discovered few years ago looking at the dark count rate of SiPMs at liquid nitrogen temperatures. Bursts are trains of single signals that happen randomly a…
View article: Dynamical symmetries and selection rules in high-harmonic generation spectroscopy of nonlinear molecules
Dynamical symmetries and selection rules in high-harmonic generation spectroscopy of nonlinear molecules Open
Real-time quantum-chemistry simulations with Gaussian basis set have been carried out to study the selection rules and molecular-orbital contribution in high-harmonic generation of water and ammonia, with a linearly polarised pulse.
View article: Investigation of the burst phenomenon in SiPMs at liquid nitrogen temperature
Investigation of the burst phenomenon in SiPMs at liquid nitrogen temperature Open
Burst effect of Silicon Photomultiplier (SiPM) at cryogenic temperatures have been discovered few years ago looking at the dark count rate of SiPMs at liquid nitrogen temperatures. Bursts are trains of single signals that happen randomly a…
View article: Cryogenic characterization of Hamamatsu HWB MPPCs for the DUNE photon detection system
Cryogenic characterization of Hamamatsu HWB MPPCs for the DUNE photon detection system Open
The Deep Underground Neutrino Experiment (DUNE) is a next generation experiment aimed to study neutrino oscillation. Its long-baseline configuration will exploit a Near Detector (ND) and a Far Detector (FD) located at a distance of ∼1300 k…
View article: Model-independent extraction of form factors and $|V_{cb}|$ in $\overline{B} \rightarrow D \ell^- \overlineν_\ell$ with hadronic tagging at BaBar
Model-independent extraction of form factors and $|V_{cb}|$ in $\overline{B} \rightarrow D \ell^- \overlineν_\ell$ with hadronic tagging at BaBar Open
Using the entire BaBar $Υ(4S)$ data set, the first two-dimensional unbinned angular analysis of the semileptonic decay $\overline{B} \rightarrow D \ell^- \overlineν_\ell$ is performed, employing hadronic reconstruction of the tag-side $B$ …
View article: 3‐Hydroxypyridinyl‐Substituted‐1,2,4‐Triazoles as New ESIPT Based Fluorescent Dyes: Synthesis and Structure–Fluorescence Properties Correlations
3‐Hydroxypyridinyl‐Substituted‐1,2,4‐Triazoles as New ESIPT Based Fluorescent Dyes: Synthesis and Structure–Fluorescence Properties Correlations Open
This report presents the design, synthesis, and photophysical study of two new series of promising fluorescent trisubstituted triazoles, 3‐hydroxypyridinyl substituted‐1,2,4‐triazoles (PyOHTr) and 2‐pyridonyl substituted‐1,2,4‐triazoles (P…
View article: Search for heavy neutral leptons using tau lepton decays at <i>BaBaR</i>
Search for heavy neutral leptons using tau lepton decays at <i>BaBaR</i> Open
This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model τ neutrino with a mixing strength of |Uτ4|2, corresponding to the absolute sq…
View article: Search for $B$ Mesogenesis at BABAR
Search for $B$ Mesogenesis at BABAR Open
A new mechanism has been proposed to simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the universe. This scenario predicts exotic $B$ meson decays into a baryon and a dark sector anti-baryon ($ψ_D$)…
View article: Comparison of long-range corrected kernels and range-separated hybrids for excitons in solids
Comparison of long-range corrected kernels and range-separated hybrids for excitons in solids Open
The most accurate theoretical method to describe excitons is the solution of the Bethe-Salpeter equation in the GW approximation (GW-BSE). However, because of its computation cost, time-dependent density functional theory (TDDFT) is becomi…
View article: Photoionization and core resonances from range-separated time-dependent density-functional theory for open-shell states: Example of the lithium atom
Photoionization and core resonances from range-separated time-dependent density-functional theory for open-shell states: Example of the lithium atom Open
We consider the calculations of photoionization spectra and core resonances of open-shell systems using range-separated time-dependent density-functional theory. Specifically, we use the time-dependent range-separated hybrid (TDRSH) scheme…
View article: Comparison of long-range corrected kernels and range-separated hybrids for excitons in solids
Comparison of long-range corrected kernels and range-separated hybrids for excitons in solids Open
The most accurate theoretical method to describe excitons is the solution of the Bethe-Salpeter equation in the GW approximation (GW-BSE). However, because of its computation cost, time-dependent density functional theory (TDDFT) is becomi…
View article: Performance of the LHCb RICH detectors during LHC Run 2
Performance of the LHCb RICH detectors during LHC Run 2 Open
The performance of the ring-imaging Cherenkov detectors at the LHCb experiment is determined during the LHC Run 2 period between 2015 and 2018. The stability of the Cherenkov angle resolution and number of detected photons with time and ru…
View article: Search for an Axionlike Particle in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math> Meson Decays
Search for an Axionlike Particle in Meson Decays Open
Axionlike particles (ALPs) are predicted in many extensions of the standard model, and their masses can naturally be well below the electroweak scale. In the presence of couplings to electroweak bosons, these particles could be emitted in …
View article: Photoionization and core resonances from range-separated density-functional theory: General formalism and example of the beryllium atom
Photoionization and core resonances from range-separated density-functional theory: General formalism and example of the beryllium atom Open
We explore the merits of linear-response range-separated time-dependent density-functional theory (TDDFT) for the calculation of photoionization spectra. We consider two variants of range-separated TDDFT, namely the timedependent range-sep…
View article: A newly observed phenomenon in the characterisation of SiPM at cryogenic temperature
A newly observed phenomenon in the characterisation of SiPM at cryogenic temperature Open
In this article we report a novel phenomenon that we observed while evaluating the performances of different models of silicon photomultiplier detectors at liquid nitrogen temperature. Bursts of consecutive events, characterized by a rate …
View article: Search for Lepton Flavor Violation in $Υ(3S)\rightarrow e^{\pm}μ^{\mp}$
Search for Lepton Flavor Violation in $Υ(3S)\rightarrow e^{\pm}μ^{\mp}$ Open
We report on the first search for electron-muon lepton flavor violation (LFV) in the decay of a $b$~quark and $b$~antiquark bound state. We look for the LFV decay $Υ(3S)\rightarrow e^{\pm}μ^{\mp}$ in a sample of 118~million $Υ(3S)$ mesons …
View article: Search for Darkonium in $e^+e^-$ Collisions
Search for Darkonium in $e^+e^-$ Collisions Open
Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existenc…
View article: Role of Exchange and Correlation in High-Harmonic Generation Spectra of H2, N2 and CO2: Real-Time Time-Dependent Electronic-Structure Approaches
Role of Exchange and Correlation in High-Harmonic Generation Spectra of H2, N2 and CO2: Real-Time Time-Dependent Electronic-Structure Approaches Open
This study arises from the attempt to answer the following question: how different descriptions of electronic exchange and correlation affect the high-harmonic generation (HHG) spectroscopy of H2, N2 and CO2 molecules? We compare HHG spect…
View article: Probing the Molecular Frame of Uracil and Thymine with High Harmonic Generation Spectroscopy
Probing the Molecular Frame of Uracil and Thymine with High Harmonic Generation Spectroscopy Open
In this work we present computed high-harmonic generation (HHG) spectra of uracil and thyminemolecules, by means of the real-time time-dependent formulation of Gaussian-based configurationinteraction with single excitations (RT-TD-CIS). Ac…
View article: Probing the Molecular Frame of Uracil and Thymine with High Harmonic Generation Spectroscopy
Probing the Molecular Frame of Uracil and Thymine with High Harmonic Generation Spectroscopy Open
In this work we present computed high-harmonic generation (HHG) spectra of uracil and thyminemolecules, by means of the real-time time-dependent formulation of Gaussian-based configurationinteraction with single excitations (RT-TD-CIS). Ac…
View article: A feasibility study for a low energy threshold particle detector in a xenon crystal
A feasibility study for a low energy threshold particle detector in a xenon crystal Open
In this paper we report on the growing of a large xenon crystal that can be used as low energy threshold particle detector for applications in dark matter searches. A large xenon crystal of ∼150 cm3 volume has been grown exploiting the Bri…
View article: New ideas on prospective low energy threshold detectors for dark matter searches
New ideas on prospective low energy threshold detectors for dark matter searches Open
Low energy threshold detectors are necessary in many frontier fields of experimental physics. In particular, these are extremely important for probing possible dark matter (DM) candidates. We present a novel detection approach that exploit…
View article: Search for a Stable Six-Quark State at BABAR
Search for a Stable Six-Quark State at BABAR Open
Recent investigations have suggested that the six-quark combination uuddss could be a deeply bound state (S) that has eluded detection so far, and a potential dark matter candidate. We report the first search for a stable, doubly strange s…
View article: Measurement of the Spectral Function for the τ⁻→ K⁻K[subscript S]ν[subscript τ] Decay
Measurement of the Spectral Function for the τ⁻→ K⁻K[subscript S]ν[subscript τ] Decay Open
The decay τ⁻→K⁻K[subscript S]ν[subscript τ] has been studied using 430×10⁶ e⁺e⁻→τ⁺τ⁻ events produced at a center-of-mass energy around 10.6 GeV at the PEP-II collider and studied with the BABAR detector. The mass spectrum of the K⁻K[subscr…
View article: Search for the decay mode B[superscript 0] → pp[¯ over p][¯ over p]
Search for the decay mode B[superscript 0] → pp[¯ over p][¯ over p] Open
A search is presented for the four-body decay B[superscript 0] → pp[¯ over p][¯ over p] in a sample of 471 million B[¯ B] pairs collected with the BABAR detector, operated at the SLAC PEP-II asymmetric-energy e[superscript +]e[superscript …
View article: Study of ϒ(1S) Radiative Decays to γπ[superscript +]π[superscript −] and γ K[superscript +]K[superscript −]
Study of ϒ(1S) Radiative Decays to γπ[superscript +]π[superscript −] and γ K[superscript +]K[superscript −] Open
We study the ϒ(1S) radiative decays to γπ[superscript +}]π[superscript -] and γK[superscript +]Kp[superscript -] using data recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e[superscript +]e[superscript -] co…
View article: Study of the process e[superscript +] e[superscript −] → π[supsercript +]π[superscript −]η using initial state radiation
Study of the process e[superscript +] e[superscript −] → π[supsercript +]π[superscript −]η using initial state radiation Open
We study the process e[superscript +]e[superscript -] →π[superscript +]π[superscript -]ηγ, where the photon is radiated from the initial state. About 8000 fully reconstructed events of this process are selected from the BABAR data sample w…