“…These rare four-body decays of neutral charm mesons receive contributions from electroweak flavour-changing neutral current $c\to u\ell^+\ell^-$ transitions and are unique probes for potential new heavy degrees of freedom and for additional sources of $CP$ violation in the up-type quark sector. Using a sample of proton-proton collisions corresponding to an integrated luminosity of 2fb$^{-1}$ recorded at a center-of-mass energy of 8TeV in 2012, the first observation of $D^0\to\pi^+\pi^-\mu^+\mu^-$ and $D^0\rightarrow K^+K^-\mu^+\mu^-$ decays is reported. …”
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“…This is taken as the starting point for many interesting nonperturbative applications, both in the light and heavy quark sector. Subsequently crossed channel dynamics is introduced within the equations for calculating the partial-wave amplitudes. …”
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“…In addition, an interpretation of the transverse momentum distribution of the Higgs boson is performed as an indirect probe of the Yukawa coupling of the Higgs boson to the charm quark. Resulting limits on the strength of anomalous interactions are presented for these two approaches.…”
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“…The $\phi_s$ is defined as the weak phase difference between $B_s^0 - \bar{B_s^0}$ mixing amplitude and $b \rightarrow c \bar{c} s$ decay amplitude and it is related to the CKM quark mixing matrix. Its theoretically predicted value is small in the Standard Model, $\phi_s = -0.0363^{+0.0016}_{-0.0015}$. …”
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“…A search for the associated production of a top-quark pair with the Higgs boson ($t\bar{t}H$) in multilepton final states is presented. …”
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“…The $I_\mathrm{AA}$ is observed to be significantly suppressed at large hadron $p_\mathrm{T}$ or $x_\mathrm{hZ}$, presumably due to interaction of the hard-scattered partons with a hot and dense quark-gluon plasma. The $I_\mathrm{AA}$ results are compared to the predictions of jet modification in several Monte Carlo generators and theoretical calculations.…”
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“…This project focuses in a search for Higgs boson invisible decay modes has been carried out in events where the Higgs boson is produced in association with a top quark-antiquark pair (ttH). The study will focus on production modes that include only hadronic objects (jets), that drive the sensitivity in the Higgs to invisible channel. …”
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“…Furthermore, it is expected that light partons lose energy dominantly via gluon bremsstrahlung, while in the case of heavy-quark-initiated-jets, collisional energy loss may play a more important role. …”
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“…The $\phi_s$ is defined as the weak phase difference between $B_s^0- \bar{B_s^0}$ mixing amplitude and $b \rightarrow c \bar{c} s$ decay amplitude and it is related to the CKM quark mixing matrix. Its theoretically predicted value is small in the Standard Model, $\phi_s = -0.0363^{+0.0016}_{-0.0015}$. …”
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“…As main changes in 2019, the EOS service has been migrated to the QuarkDB namespace, and half of the service nodes have been migrated to FUSEX client. …”
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“…A search for high-momentum Higgs bosons, produced with an associated jet and decaying to bottom quark pairs, is conducted using an integrated luminosity of $80.5~\mathrm{fb}^{-1}$ of proton-proton collisions at $\sqrt{s} = 13~\mathrm{TeV}$ collected with the ATLAS detector at the Large Hadron Collider. …”
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“…The search for them is complicated due to the large amount of background events from processes like $t\bar{t}$ and single top-quark production. In order to optimize the search for the flavour-changing neutral current processes, neural networks are used to construct a discriminant, which strongly separates signal events from background events. …”
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“…In heavy-ion collisions, the long-range correlations are known to arise from the collective dynamics of the produced quark-gluon plasma (QGP). The similarity between the $pp$ and heavy-ion measurements raises the possibility that a tiny droplet of the QGP is produced even in $pp$ collisions. …”
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“…Measurements of hard-scattered partons produced in conjunction with a high-pT photon or Z boson offer a discerning way to study the quark gluon plasma (QGP) created in ultrarelativistic nucleus-nucleus collisions. …”
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“…It has been recently suggested that the exclusive $J/\psi$ production of electron-deuteron scattering at the Electron-Ion Collider (EIC) would provide new insights into the SRCs, in particular from the aspect of the underlying quark-gluon dynamics. In the absence of electron-nucleus data from an EIC, data from deuteron-gold (d+Au) ultra-peripheral collisions (UPCs) recorded by the STAR detector at the Relativistic Heavy Ion Collider can be used as a proxy to test various techniques and hypotheses. …”
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“…--HTML-->Jet quenching is a possible consequence of the formation of a quark-gluon plasma (QGP) in collision systems, but to date no significant jet quenching has been observed in small systems. …”
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“…--HTML-->Measurements of hard-scattered partons produced in conjunction with a high-pT photon or Z boson offer a discerning way to study the quark gluon plasma (QGP) created in ultrarelativistic nucleus-nucleus collisions. …”
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“…When considering heavy-ion collisions, particle polarization could also be used to investigate the characteristics of the hot and dense medium (Quark-Gluon Plasma) created at LHC energies. Recently, it has been hypothesized that quarkonium states could be polarized by the strong magnetic field generated in the early phase of the evolution of the system. …”
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“…We consider specifically the production of a pair of heavy top squarks which decay to a $b$-quark and a chargino, which in turn decays into $bbs$ via a virtual top squark. …”
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“…Charmonium production is highly sensitive to the hot and dense medium created in (ultra)-relativistic heavy-ion collisions, known as the Quark-Gluon Plasma (QGP). Measurements of the J/$\psi$ production serve as important tools for studying the properties of this medium. …”
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