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Measurement of forward η meson production with the LHCf-Arm2 detector at LHC
Get PDFIn this paper, we present the data analysis strategy and the re- sults of the forward η meson production measurement in proton-proton collisions at
s = 13 TeV, carried out with the LHCf-Arm2 detector. This is the first observa- tion of η mesons in the forward region of proton-proton collisions at high energies and will allow a better understanding of the mechanisms by which these particles are generated. We show the comparison between the experimental data and the pre- dictions of some hadronic interaction models that are widely used in fundamental physics. Finally, we discuss the improvements that the data collected by the LHCf experiment during Run III of the LHC will bring to this measurement
The precision measurement of the muon g−2 at Fermilab
Get PDFThe Muon g − 2 Experiment at Fermilab aims to measure the magnetic anomaly of the muon with the unprecedented precision of 140 parts per billion. In April 2021, the collaboration published the first measurement based on the first year of data collection, which was found to be consistent with the previous experiment at Brookhaven. The new global average of the experimental measurements strengthens the long-standing tension with the data-driven Standard Model prediction to a combined discrepancy of 4.2o. On the theory side, however, recent improvements in the theoretical calculation of the hadronic contribution based on Lattice-QCD techniques are introducing new tensions on the value predicted by the theory. The Muon g−2 Experiment at Fermilab has now concluded its sixth and final year of data taking and a new result based on the Run-2 and Run-3 data was published in August 2023. This paper briefly describes the precision measurement conducted by the Muon g − 2 Experiment at Fermilab and its current status
The CMS Experiment Tracker Upgrade for High Luminosity LHC
Get PDFhe High Luminosity Large Hadron Collider (HL-LHC) at CERN is expected to collide protons at a centre-of-mass energy of 14TeV and to reach an unprecedented peak instantaneous luminosity of 5 − 7.5 × 1034 cm−2s−1 with an average number of pileup events of 140-200. This will allow the CMS experiments to collect integrated luminosities up to 3000-4500fb−1 during the project lifetime. To cope with this extreme scenario, the CMS detector will be substantially upgraded before starting the HL-LHC, a plan known as CMS Phase-2 upgrade. The entire CMS silicon tracker detector will be replaced and the new detector will feature increased radiation hardness, finer granularity, longer trigger latency and higher data rate capability. The new tracker will consist of two main subdetectors: the Inner Tracker, containing pixel modules, and the Outer Tracker, consisting of strip and macro-pixel modules. In this paper the Phase-2 upgrade of the CMS tracker is reviewed
Automated Assembly of the ATLAS ITK Pixel Detector using the Pick&Place Technique
Get PDFThe new upgrade program for LHC foreseen for the 2026, will lead to the replacement of the entire tracking system of the ATLAS experiment (The ATLAS Collaboration, JINST, 3 (2008) S08003). The ATLAS vertex detector will be a silicon pixel detector, the largest ever built (13 m2 active area), with a very high spatial granularity (50 μm × 50 μm), radiation hard (up to 1 Grad) and featuring an unprecedented data rate (thousands of optical links at 5.12 Gbps). The Italian ATLAS Collaboration has the responsibility for the construction, test, and commissioning of about thirty detector rings that will be mechanically located on three cylinders. In this paper, we describe the automated assembly technique developed by the Italian sites involved in the pixel ring construction
Results on pre-series production and QA/QC tests of the double-ends readout panels of the new layer of trigger chambers for the ATLAS muon spectrometer phase 2 upgrade
Get PDFIn view of High Luminosity LHC upgrade, the ATLAS experiment will add a new layer of Resistive Plate Chambers (RPC) trigger chambers into the barrel muon spectrometer. These next-generation RPC chambers will use a 1 mm gap and a single type of readout strips coupled to front-end electronics capable of providing both coordinates in the detector plane. The procedures for assembling the readout panels and the results of Quality Assurance and Quality Control (QA/QC) tests on the pre-series panels is reported here
Towards dipolar supersolids in a ring
Get PDFInrecent years many fundamental properties of the supersolid phase of matter have been studied, but the question of how such a peculiar state rotates remains experimentally unexplored. In this paper I report on an ongoing experiment
made towards the trapping of a supersolid inside a ring potential, to study its rotational properties. I present both the experimental realization of the ring and numerical simulations done to study the superfluid to supersolid phase transition in an annular geometry
Charge-to-spin interconversion at (111) oxide interfaces
Get PDFIn the field of spin-orbitronics, the intrinsic spin-orbit coupling (SOC) of materials is exploited to convert spin to charge and viceversa. The Edelstein effect is a peculiar spin-orbitronic phenomenon, typical of two-dimensional (2D) systems with SOC and broken inversion symmetry, where a magnetization is produced in response to an electric field. A natural platform to exhibit this feature are two-dimensional electron gases at oxide interfaces. Here we predict an Edelstein response at (111) LaAlO3/SrTiO3 interface, discussing in detail the differences with the canonical Edelstein effect in a simple isotropic Rashba model. We predict a tunable spin and orbital magnetization, commenting on the possibility of disentangling the two in order to exploit them theoretically and practically
Tracking studies for the FCC-ee collimation system design
Get PDFThe Future Circular electron-positron Collider (FCC-ee) is being designed for stored beam energies up to 17.8 MJ, a value almost two orders of magnitude higher than any previous lepton collider. In this new regime, collimators
are needed not only to control experimental backgrounds, but also to protect the machine from magnet quenches, or even damage. A beam-halo collimation system is therefore under study to protect the most sensitive equipment from unavoidable losses. Tracking simulations are key studies to evaluate the performance of the collimation system and are essential in an iterative process to converge to an opti
mum performance. In this paper, we present the results of collimation performance studies by means of power load distributions around the collider ring and propose possible optimizations of the halo collimation system
Electroweak measurements at LHCb with the calorimeter upgrade
Get PDFThe LHCb experiment covers the forward region of proton-proton collisions, and it can improve the current electroweak landscape by studying W and Z bosons in this phase space complementary to ATLAS and CMS. Thanks to the excellent detector performance, fundamental parameters of the Standard Model can be precisely measured by studying the properties of the electroweak bosons. In this communication, an overview of the wide LHCb electroweak measurement
program will be presented. The proposal of a new calorimeter for LHCb will be also presented: this calorimeter could enhance the performance on electroweak boson measurements in the High Luminosity LHC era, by precisely measuring the energy of electrons and hadronic jets in a high pile-up environment
Strategies for solving the Anderson model via Quantum Computer
Get PDFWe apply the Variational Quantum Eigensolver to the study of the periodic Anderson model in the atomic limit. After presenting the steps necessary for the implementation of the algorithm, such as the fermionic mapping of the Hamiltonian and the construction of the variational ansatz, we will discuss the results obtained by simulations carried out using resources provided by IBM, as well as the performance of the chosen ansatz for the considered system, in ideal and noisy environment. Finally, we apply a simple mitigation scheme to the noisy scenario to improve the algorithm’s accuracy