“…A photon from one nucleus can fluctuate into a quark antiquark pair and interact directly with the other nucleus to produce a vector meson (e.g. …”
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“…I will then highlight the results from our most recent papers (https://arxiv.org/abs/2006.07172 and https://arxiv.org/abs/2009.02220), where we use this method to tackle a whole class of “Vector-like Quark” models and the 2HDM+a, and show complementary results to the direct search program.…”
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“…This note reports studies of Higgs boson production with sizeable transverse momentum decaying to a $b\bar{b}$ quark pair. The analyzed data were recorded with the ATLAS detector in proton-proton collisions with a center-of-mass energy of $\sqrt{s}=13$~TeV at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 136~fb$^{-1}$. …”
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“…This note presents a search for a charged Higgs boson ($H^{\pm}$) decaying to a pseudoscalar particle ($A$) and a $W$ boson in top-quark pair events. It selects events with one electron and two muons in the final state and three or more jets, at least one of which is $b$-tagged. …”
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“…This thesis describes my work on the Higgs boson fiducial cross section measurements, both inclusively and differentially, performed with full Run 2 dataset, together with their interpretation in different theoretical frameworks: Pseudo-Observables and $\kappa$-framework to constrain the Yukawa coupling with the charm quark. The Higgs boson CP properties have been also tested, in particular in the VBF production mechanism, looking for possible CP-violation effects in the Higgs sector in an Effective Field Theory (EFT) framework.…”
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“…This precision begins to probe an apparent discrepancy in the fundamental theory that has arisen in a class of nuclear beta decay measurements, in particular a violation of unitarity in the first row of the CKM quark mixing matrix when using Vud from nuclear decay. …”
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“…These observations are consistent with previous measurements that used two-particle correlations, and with an interpretation in terms of parton energy loss in a high-density quark gluon plasma. These yield modifications vanish in peripheral Pb$-$Pb collisions and are not observed in either high-multiplicity pp or p$-$Pb collisions.…”
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“…Jet quenching is the process of color-charged partons losing energy via interactions with quark-gluon plasma droplets created in heavy-ion collisions. …”
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“…A Large Ion Collider Experiment (ALICE), situated on the Large Hadron Collider (LHC), is optimised to study relativistic heavy-ion collisions in order to quantitatively characterise the Quark Gluon Plasma. The inner-most detector system, the Inner Tracking System (ITS), is responsible for primary and secondary vertex reconstruction in the vicinity of the interaction point, as well as stand-alone tracking of particles unable to reach the rest of the ALICE sub-detectors, due to momentum cut-off and acceptance limitations. …”
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“…Event-by-event fluctuations of conserved quantities such as electric charge, baryon number, and strangeness in ultrarelativistic heavy-ion collisions provide insight into the properties of the quark-gluon plasma and the QCD phase diagram. The net-charge fluctuations in finite phase space are usually studied using the $\nu_{dyn}[+,-]$ observable, which is robust against the detection efficiency losses. …”
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“…ALICE is a high-energy physics experiment at the CERN Large Hadron Collider (LHC) in Geneva, to study the properties of quark-gluon plasma, formed in heavy-ion collisions. …”
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“…The microscopic origin of this striking phenomenon, historically interpreted as a signature of quark-gluon plasma (QGP) formation in heavy-ion collisions, is still unknown: is it related to soft particle production or to hard scattering events, such as jets? …”
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“…The inclusive top quark pair ($t\bar{t}$) production cross-section $\sigma_{t\bar{t}}$ has been measured in proton-proton collisions at $\sqrt{s} = 13.6$ TeV, using 1.2 fb${}^{-1}$ of data collected in August 2022 by the ATLAS experiment at the Large Hadron Collider. …”
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“…FoCal will also carry out measurements at very forward rapidity in Pb$-$Pb collisions, enabling novel probes of the Quark-Gluon Plasma based on jet quenching phenomena and long-range correlations of neutral pions, jets, and photons. …”
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“…When considering heavy-ion collisions, quarkonium polarization could also be used to investigate the characteristics of the hot and dense medium (quark–gluon plasma) created at LHC energies. In ALICE, this observable was extracted for the first time in Pb–Pb collisions and a significant difference with respect to a corresponding measurement in pp collisions by the LHCb was found. …”
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“…Thermal radiation from the hadronic phase contributes to the spectrum at low invariant mass ($m_{\rm ee}$), while thermal radiation from the quark-gluon plasma (QGP) at larger $m_{\rm ee}$ carries information about the early temperature of the medium. …”
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“…A search for non-resonant Higgs boson pair ($HH$) production is presented, in which one of the Higgs bosons decays to a b-quark pair ($b\bar b$) and the other decays to $WW^*$, or $ZZ^*$, or $\tau^+\tau^-$, with in each case a final state with $\ell^+\ell^- +$ neutrinos ($\ell = e, \mu$). …”
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“…Future electron-positron colliders, or Higgs factories, impose stringent requirements on the energy resolutions of hadrons and jets for the precision physic programs of the Higgs, Z, W bosons and the top quark. To address the challenges, one of the state-of-art calorimetry options is based on the particle flow algorithms (PFA) and requires fine longitudinal and transverse segmentations to achieve excellent separation capability to distinguish near-by particle showers. …”
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“…In addition to the jet trigger efficiency studies performed with recorded data, a study performed with simulated data shows higher trigger efficiency for data scouting compared to the standard HLT selection of Higgs bosons produced with high transverse momentum decaying into a bottom quark-antiquark pair. The efficiency studies performed with recorded data further shows that electrons and photons in data scouting are sensitive to physics above $p_T >$~30~GeV in scenarios where one electron or photon is required.…”
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“…Finally relations between the CKM parameters and the quark masses are examined within a given model.…”
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