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Report of the first workshop to identify approaches and techniques in the domain of quantum sensing that can be utilized by future High Energy Physics applications to further the scientific goals of High Energy Physics.
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Neutrinos are copiously produced at particle colliders, but no collider neutrino has ever been detected. Colliders, and particularly hadron colliders, produce both neutrinos and anti-neutrinos of all flavors at very high energies, and they are therefore highly complementary to those from other sources. FASER, the recently approved Forward Search Experiment at the Large Hadron Collider, is ideally located to provide the first detection and study of collider neutrinos. We investigate the prospects for neutrino studies of a proposed component of FASER, FASER$ u$, a 25cm x 25cm x 1.35m emulsion detector to be placed directly in front of the FASER spectrometer in tunnel TI12. FASER$ u$ consists of 1000 layers of emulsion films interleaved with 1-mm-thick tungsten plates, with a total tungsten target mass of 1.2 tons. We estimate the neutrino fluxes and interaction rates at FASER$ u$, describe the FASER$ u$ detector, and analyze the characteristics of the signals and primary backgrounds. For an integrated luminosity of 150 fb$^{-1}$ to be collected during Run 3 of the 14 TeV Large Hadron Collider from 2021-23, and assuming standard model cross sections, approximately 1300 electron neutrinos, 20,000 muon neutrinos, and 20 tau neutrinos will interact in FASER$ u$, with mean energies of 600 GeV to 1 TeV, depending on the flavor. With such rates and energies, FASER will measure neutrino cross sections at energies where they are currently unconstrained, will bound models of forward particle production, and could open a new window on physics beyond the standard model.
A summary is presented of the workshop top physics at linear colliders that was held at IFIC Valencia from the 30th of June to the 3rd July 2015. We present an up-to-date status report of studies into the potential for top quark physics of lepton colliders with an energy reach that exceeds the top quark pair production threshold, with a focus on the linear collider projects ILC and CLIC. This summary shows that such projects can offer very competitive determinations of top quark properties (mass, width) and its interactions with other Standard Model particles, in particular electroweak gauge bosons and the Higgs boson. In both areas the prospects exceed the LHC potential significantly - often by an order of magnitude.
With the discovery of a Higgs boson at LHC, all particles of the Standard Model seem to have been observed experimentally, yet many questions are left unanswered. The discovery has intensified the planning for future high-energy colliders, which aim to probe the Standard Model and the mechanism of electroweak symmetry breaking with higher precision and to extend and complement the search for new particles currently under way at the LHC. The most mature option for such a future facility is the International Linear Collider ILC, an electron-positron collider with a centre-of-mass energy of 500 GeV, and the potential for upgrades into the TeV region. The ILC will fully explore the Higgs sector, including model-independent coupling and width measurements, direct measurements of the coupling to the top quark and the Higgs self-coupling, enable precision measurements of top quark properties and couplings as well as other electroweak precision measurements and provide extensive discovery potential for new physics complementary to the capabilities of hadron colliders. This paper will give an overview of the physics case of the ILC, put in context of the running scenario covering different centre-of-mass energies, and discuss the current status and perspectives of this global facility.
In this paper, we present the physics performance of the ESSnuSB experiment in the standard three flavor scenario using the updated neutrino flux calculated specifically for the ESSnuSB configuration and updated migration matrices for the far detector. Taking conservative systematic uncertainties corresponding to a normalization error of $5%$ for signal and $10%$ for background, we find that there is $10sigma$ $(13sigma)$ CP violation discovery sensitivity for the baseline option of 540 km (360 km) at $delta_{rm CP} = pm 90^circ$. The corresponding fraction of $delta_{rm CP}$ for which CP violation can be discovered at more than $5 sigma$ is $70%$. Regarding CP precision measurements, the $1sigma$ error associated with $delta_{rm CP} = 0^circ$ is around $5^circ$ and with $delta_{rm CP} = -90^circ$ is around $14^circ$ $(7^circ)$ for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have $3sigma$ sensitivity for 540 km baseline except $delta_{rm CP} = pm 90^circ$ and $5sigma$ sensitivity for 360 km baseline for all values of $delta_{rm CP}$. The octant of $theta_{23}$ can be determined at $3 sigma$ for the values of: $theta_{23} > 51^circ$ ($theta_{23} < 42^circ$ and $theta_{23} > 49^circ$) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at $3 sigma$ are: $40^circ < theta_{23} < 52^circ$ ($42^circ < theta_{23} < 51.5^circ$) and $2.485 times 10^{-3}$ eV$^2 < Delta m^2_{31} < 2.545 times 10^{-3}$ eV$^2$ ($2.49 times 10^{-3}$ eV$^2 < Delta m^2_{31} < 2.54 times 10^{-3}$ eV$^2$) for the baseline of 540 km (360 km).
Physics Beyond Colliders is an exploratory study aimed at exploiting the full scientific potential of CERNs accelerator complex and its scientific infrastructure in the next two decades through projects complementary to the LHC, HL-LHC and other possible future colliders. These projects should target fundamental physics questions that are similar in spirit to those addressed by high-energy colliders, but that require different types of beams and experiments. A kick-off workshop held in September 2016 identified a number of areas of interest and working groups have been set-up to study and develop these directions. All projects currently under consideration are presented including physics motivation, a brief outline of the experimental set-up and the status of the corresponding beam and detector technological studies. The proposals are also put in context of the worldwide landscape and their implementation issues are discussed.
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