Conveners
Poster session: Poster session
- Angeles Faus-Golfe (IJClab IN2P3 CNRS-Université Paris-Saclay (FR))
- Frank Zimmermann (CERN)
Global fits to electroweak precision data, comparing the measured values of different quantities with the SM predictions, provide important checks of the SM consistency and sensitivity to beyond-the-SM (BSM) effects. The two most sensitive determinations of $\sin^2 \theta_{\rm eff}^{\rm lep}$, from the LEP measurement of $A_{0,b}^{FB}$ and the SLD measurement of $A_\ell$,
are in...
The successful identification of strange quark jets at the FCC-ee would enable the study of a multitude of largely unexplored processes, including the first ever study of Z->ss production, rare Higgs boson decays and the strange Yukawa coupling, CKM matrix elements via W decays, and BSM physics scenarios such as FCNCs. Due to the challenging nature of distinguishing these medium-mass quarks,...
Numerous studies and measurements planned at the FCC-ee rely on efficient and accurate jet flavour tagging algorithms, which in turn heavily rely on secondary vertex reconstruction as b and c jets contain long-lived hadrons that decay hundreds of microns from the collision point. At the same time, vertex reconstruction is also an important tool to test the performance of different vertex...
GRAiNITE Studies
Presentation of a new type of sampling ECAL calorimeter. It is of the Shaslik type with WLS fibers, but instead of lead and scintillator plates, it uses a mixture of crystal scintillator grains and heavy liquid. According to Geant 4 studies, the finer sampling allows to reach a resolution < 2%/sqrt(E) A sample of ZnWO4 grains obtained by “spontaneous” flux method...
The Higgs boson trilinear and quartic self-couplings are directly related to the shape of the Higgs potential; measuring them with precision is extremely important, as they provide invaluable information on the electroweak symmetry breaking and the electroweak phase transition.
\In this paper, we perform a detailed analysis of double Higgs boson production, through the gluon-gluon fusion...
A plethora of measurements at the FCC-ee crucially depend on efficient flavour tagging and precise flight distance measurements. To achieve this, the innermost piece of the FCC-ee detectors, the vertex detector, has to precisely locate the collision vertices, while adding only a minimal amount of material to the detector.
The proposed reduction of the beam pipe radius at the FCC-ee from...
KKMCee version 5.0 Monte Carlo event generator is for lepton and quark pair production for the high energy electron-positron annihilation process. It is the most sophisticated event generator for such processes. Its entire source code is now re-written in the modern C++ language (to be included in the FCCee software soon). It reproduces all features of the older KKMC code in Fortran 77....
Recent analyses on high-energy inclusive Higgs-boson rates in proton collisions via the gluon fusion channel, matched with the state of-the-art fixed-order N$^3$LO accuracy, have shown that the impact of high-energy resummation corrections reaches 10\% at the FCC nominal energies. This supports the statement that electroweak physics at 100 TeV is expected to receive relevant contributions from...
In this work, we derive lower mass bounds on the $Z^\prime$ gauge boson based on the dilepton data from LHC with 13 TeV of center-of-mass energy, and forecast the sensitivity of the High-Luminosity-LHC with $L=3000 fb^{-1}$, the High-Energy LHC with $\sqrt{s}=27$~TeV, and also at the Future Circular Collider with $\sqrt{s}=100$~TeV. We take into account the presence of exotic and invisible...
The cool-down and cryostating of the FCC superconducting magnets requires transport and distribution of large quantities of cryogens over distance up to 10 km. It significantly exceeds the experience gained from the existing Big Science helium cryogenic systems. To limit the pressure drop and the distribution header diameters, cryogens could be distributed at high pressure up to 50 bar. Such...
The Karlsruhe Research Accelerator (KARA) at KIT was the first synchrotron to successfully implement near-field electro-optical (EO) beam diagnostics to conduct turn-by-turn bunch profile measurements. In the scope of the FCC Innovation Study (FCCIS), this beam diagnostics concept is under investigation as a tool for the future electron-positron collider FCC-ee to measure center-of-charge and...
The design of future lepton colliders, which would push the beam intensity frontier significatively forward with respect to the current state of the art, paves the way to novel technological challenges. In particular, the need for very high positron yield in the linear (ILC and CLIC) or circular (FCC-ee, CEPC) colliders requires that innovative approaches to the positron production are...
High temperature superconductors-coated conductors (HTS-CC) with its significantly low surface impedance at low temperature (below superconducting critical temperature Tc) are being considered a good alternative to Cu as coatings for the beam screen of the hadron-hadron future circular collider (FCC-hh). In particular, rare-earth barium cuprates (REBCO-CC) are excellent candidates considering...
Within the framework of the Future Circular Collider Feasibility Study, the design of the electron-positron collider FCC-ee is optimised. Polarized low intensity pilot bunches are foreseen at the first energy stages to determine the beam energy, and thus sufficient level of polarization must be achieved which can be limited by alignment and optics errors. Additionally, strong synchrotron...
The ability to know the beam energy extremely precisely is a fundamental asset for any storage ring lepton collider such as the FCC-ee. Since the energy is fundamentally related to the spin tune, measuring the spin precession frequency determines the energy; the method requires that the beams be polarized. We present here first simulations for a simplified lepton storage ring with 100 m...
Over the years, it has been observed for cavities in operation in accelerators, a continuous degradation of their performance with the appearance or reinforcement of the parasitic field emission phenomenon. This phenomenon, caused by surface pollution promoting the emission and acceleration of electrons by electromagnetic fields, causes the generation of ionizing X radiations. This poses...
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The escalating interest of the future lepton colliders with high luminosity, draws the attention to the crucial role of the positron sources. One of these colliders is the FCC-ee. Two main positron production schemes (Conventional and Hybrid) are considered for the FCC-ee, will be discussed briefly here. The work is in progress for the development of positron generation and tracking model...
