Conveners
HE: Physics at High Energies: HE-1
- Frank Petriello (Northwestern)
- Hector de la Torre Perez (Michigan State University (US))
HE: Physics at High Energies: HE-2
- Frank Petriello (Northwestern)
- Hector de la Torre Perez (Michigan State University (US))
HE: Physics at High Energies: HE-3
- Hector de la Torre Perez (Michigan State University (US))
- Frank Petriello (Northwestern)
HE: Physics at High Energies: HE-4
- Frank Petriello (Northwestern)
- Hector de la Torre Perez (Michigan State University (US))
HE: Physics at High Energies: HE-5
- Hector de la Torre Perez (Michigan State University (US))
- Frank Petriello (Northwestern)
HE: Physics at High Energies: Joint HE-DM
- Bjoern Penning (Unive)
- Frank Petriello (Northwestern)
- Deborah Pinna (Boston University)
- Hector de la Torre Perez (Michigan State University (US))
Description
Physics at High Energies
Measurements of the fundamental properties of the Higgs boson are presented, including its mass, width, and the CP properties of its coupling in various production modes and decay channels.
Recent CMS results on Higgs physics are presented
In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. The Standard Model makes a definite prediction for the Higgs boson self-coupling and...
The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable to solely explain some observations. Many extensions of the Standard Model addressing such shortcomings introduce additional Higgs-like bosons which can be either...
The study of the 125 GeV Higgs boson can open a window of sensitivity to a new dark sector. Results of searches for both prompt and non-prompt decays of the Higgs boson into new dark sector particles in 13 TeV pp collisions with the ATLAS detector are presented. Searches that encompass a wide range of new particle masses, lifetimes and degrees of collimation of decay products are discussed.
Many theories beyond the Standard Model predict new phenomena, such as heavy vectors or scalar, vector-like quarks, and leptoquarks in final states containing bottom or top quarks. Such final states offer great potential to reduce the Standard Model background, although with significant challenges in reconstructing and identifying the decay products and modelling the remaining background. The...
Many theories beyond the Standard Model predict new phenomena, such as $Z'$, $W'$ bosons, or heavy leptons, in final states with isolated, high-pt leptons (e/mu/tau). Searches for new physics with such signatures, produced either resonantly or non-resonantly, are performed using the ATLAS experiment at the LHC. This includes a novel search that exploits the lepton-charge asymmetry in events...
Many new physics models predict the existence of Higgs-like particles decaying into two bosons (W, Z, photon, or Higgs bosons) making these important signatures in the search for new physics. Searches for Vy, VV, and VH resonances have been performed in various final states. In some of these searches, jet substructure techniques are used to disentangle the hadronic decay products in highly...
The ATLAS experiment has performed measurements of $B$-meson rare decays proceeding via suppressed electroweak flavour changing neutral currents, and of mixing and CP violation in the neutral $B^0_s$ meson system. This talk will focus on the latest results from the ATLAS collaboration, such as rare processes $B^0_s \to \mu \mu$ and $B^0_d \to \mu \mu$, and CP violation in $B^0_s \to J/\psi...
Measurements of multiboson production at the LHC are important probes of the electroweak gauge structure of the Standard Model and for contributions from anomalous couplings. In this talk we present recent ATLAS results on Zy production in association with jet activity. These differential measurements provide inputs and constraints on modeling of the Standard Model. In addition we will present...
Very detailed measurements of Higgs boson properties and its interactions can be performed with the full Run 2 pp collision dataset collected at 13 TeV, shining light over the electroweak symmetry breaking mechanism. This talk presents the latest measurements of the Higgs boson coupling properties by the ATLAS experiment in various decay bosonic and fermionic channels, as well as their...
The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates in final states with large missing transverse momentum produced in association with...
Dark matter may consist of feebly interacting massive particles (FIMPs) that have never thermalized with the cosmic plasma. Their relic density is successfully achieved through the freeze-in mechanism for a wide range of dark matter mass, significantly expanding the model space to be tested compared to other production mechanisms. However, testing the tiny couplings required by freeze-in is...
Experimentally, dark matter has not yet been observed, and there is not yet any evidence for non-gravitational interactions between dark matter and Standard Model particles. In this talk, I will briefly review dark matter searches at CMS with Run II through different approaches with a focus on model-independent and dark sector searches. Since dark matter particles themselves do not produce...
SND@LHC is a compact and stand-alone experiment to perform measurements with neutrinos produced at the LHC in a hitherto unexplored pseudo-rapidity region of 7.2 < 𝜂 < 8.6, complementary to all the other experiments at the LHC. The experiment is to be located 480 m downstream of IP1 in the unused TI18 tunnel. The detector is composed of a hybrid system based on an 800 kg target mass of...
Recent results on $B_c$ production and decays from the proton-proton collision data taken by the ATLAS experiment will be presented. The measurement of the differential ratios of $B_c^+$ and $B^+$ production cross sections at 8 TeV will be shown. New results on $B_c$ decays to $J/\psi\ D_s^{(*)}$ final states obtained with the Run 2 data at 13 TeV will also be reported.
Recent results from proton-proton collision data taken by the ATLAS experiment on charmonium and $B^+$ production will be presented. The measurement of $J/\psi$ and $\psi(2S)$ differential cross sections will be reported as measured on the whole Run 2 dataset. Results on associated production of prompt $J/\psi$ and $W$ bosons will be shown. The measurement of differential cross sections of...
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. The Higgs kinematic properties can be measured with increasing granularity and interpreted to constrain beyond-the-Standard-Model phenomena. This talk presents the measurements of the Higgs boson fiducial and differential cross sections exploiting various Higgs boson decays, as...
The motion of the photon is affected by the motion of its source, Electron, and must include all types of motion of its source. So, the photon has a three-dimensional motion, including a transition movement and a rotary motion. And it traverses in a helical trajectory. By using this definition, we have proved wave-particle duality at the same time and introduce a new equation for the photon...
Various theories beyond the Standard Model predict new, long-lived particles with unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of...
Many theories beyond the Standard Model predict new phenomena giving rise to multijet final states. These jets could originate from the decay of a heavy resonance into SM quarks or gluons, or from more complicated decay chains involving additional resonances that decay e.g. into leptons. Also of interest are resonant and non-resonant hadronic final states with jets originating from a dark...
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. This talk will present the latest results from SUSY searches conducted by the ATLAS experiment. The searches target multiple final states and different assumptions about the decay mode of the produced SUSY particles,...
Knowing that the density of a black hole is high, we can conclude that in a black hole there is a compact set of protons and neutrons that it creates such a high density and taking into account that a black hole has a surrounding area and this area can be oceans of protons and neutrons. One can also imagine the black hole as an extremely large atom whose nucleus is made of protons and neutrons...
Dark matter produced via a strongly-coupled hidden sector can produce a wide array of signatures in detectors. In particular, in a model where the standard model couples to the dark sector via a leptophobic Z' mediator, the decay of the Z' mediator would yield jets that consist of partly visible and dark matter. The signature in a detector of such a 'semi-visible jet' is a jet aligned with...
