The newly proposed Electron-Ion Collider (EIC) with its unique capability to collide polarized electrons with polarized protons and light ions at unprecedented luminosity, and with almost all elements of heavy nuclei at high energy, will be the ideal and much needed facility to explore the emerging science of nuclear femtography, and take us to the next frontier of the Standard Model of...
Based on current CERN infrastructure, an electron--proton collider is proposed at a center-of-mass energy of about 9 TeV. A 7 TeV LHC bunch is used as the proton driver to create a plasma wakefield which then accelerates electrons to 3 TeV, these then colliding with the other 7 TeV LHC proton beam. Although of very high energy, the collider has a modest projected integrated luminosity of...
Pions and kaons are, along with protons and neutrons, the main building blocks of nuclear matter. The distribution of the fundamental constituents, the quarks and gluons, is expected to be different in pions, kaons, and nucleons. However, experimental data are sparse. As a result, there has been persistent doubt about the behavior of the pion's valence quark structure function at large...
We review the physics opportunities [1] which are offered by a next generation and multi-purpose fixed-target experiment exploiting the LHC beams in order to study $pp$, $pd$ and $pA$ collisions at $\sqrt{s_{NN}} \sim 115$ GeV as well as Pb$p$ and Pb$A$ collisions at $\sqrt{s_{NN}} \sim 72$ GeV.
We propose two possible implementations, namely with an internal (polarised) gas target or with a...
In this talk I will summarize the current design status of eRHIC with special emphasis on the integration of the EIC Physics requirements into the accelerator design.
An Electron Ion Collider (EIC) has been identified in the Nuclear Physics Long Range Plan as the highest-priority facility for new construction. This talk presents an overview and status of the Jefferson Lab design of an EIC (JLEIC). It features frequent collisions of small electron and ion bunches providing a luminosity of $10^{33}$-$10^{34}$ cm$^{-1}$s$^{-1}$ in a broad range of the...
In this talk I will present an overview of the
scientific opportunities that would be addressed by the Electron-Ion-Collider
in China (EicC).
The polarized EicC will open up a new window to study
the one and three dimensions (3D) nucleon structure for both sea and valence
quarks and help fully understand the strong interaction.
In the first phase the EicC will be 3~ 5 GeV polarized
electron...
We report on a detector concept, TOPSiDE, being developed for the EIC
Electron-Ion Collider. TOPSiDE aims a the detection and identification
of all particles created in electron-proton/ion collisions at the EIC
while achieving the best possible momentum/energy resolution. The
measurement of hadronic jets exploits the advantages offered by Particle
Flow Algorithms (PFAs), which in turn require...
The proposed sPHENIX detector at the Relativistic Heavy Ion Collider (RHIC), together with RHIC’s unique capabilities to collide polarized protons and heavy nuclei, will open the door to exciting new measurements to enhance our understanding of quantum chromodynamics (QCD). These measurements will reveal more about how partons behave in a nuclear environment, explore spin-spin and...
This panel discussion will be chaired and moderated by Aharon Levy.
For more detail, see https://indico.cern.ch/event/656250/page/13094-discussion-for-a-document-for-european-strategy-update
More questions and discussions from the audience and remote participants.
A high-energy high-luminosity polarized Electron Ion Collider (EIC) was enthusiastically recommended
by the US nuclear science advisory committee (NSAC), as the highest priority new facility
to be built in the US, in its long range planning exercise conducted in 2015. Understanding the role
played by the gluons in binding quarks and gluons in nucleons and nuclei — most of the visible
universe...
In electron-proton collisions, the incoming electron is coupled directly to a parton of the proton with the exchange of a virtual photon, which has properties close to a real photon when the transfer momentum is small. In QCD, the exchanged physical photon can be approximated as a superposition of the bare photon state (direct process) and the hadronic photon state (resolved process). We...
Exclusive vector meson electroproduction over a broad $Q^2$ range offers a unique opportunity to probe the gluon structure of nuclei to measure nuclear shadowing, and to search for gluon saturation and/or the colored glass condensate at an Electron-Ion Collider. Understanding the kinematic distributions and cross sections for specific processes can impact detector design to maximize their...
A new analysis of published experimental data from the HERMES experiment has been performed. This analysis extracts new information on the space-time properties of color propagation through fitting to a geometric model of the interaction with a realistic nuclear density distribution. Our approach uses a simultaneous fit to the transverse momentum broadening observable and the hadronic...
DIS on the deuteron with detection of a proton in the nuclear fragmentation region ("spectator tagging") represents a unique method for extracting the neutron structure functions and their spin dependence. The measured proton recoil momentum (~ few 100 MeV in the deuteron rest frame) controls the nuclear configuration during the DIS process and allows one to eliminate nuclear binding effects...
Heavy flavor production in DIS (open charm, beauty) provides a direct probe of the gluon density in the target. It can be used to determine the unknown nuclear modifications of the gluon density at large x (EMC effect, antishadowing), which reveal the fundamental QCD substructure of nucleon interactions in the nucleus. We report about a study of open charm production in nuclear DIS at a future...
The Electron-Ion Collider (EIC) is the next-generation U.S.-based facility to study Quantum Chromodynamics by probing the dynamics of gluons and sea quarks with comprehensive and systematic measurements of high precision. The experimental program of the EIC is, thus, diverse, covering a broad range of studies from mapping the spatial, momentum, spin, and flavor distributions of gluons and sea...
In this talk I will discuss the challenges to measure hadron polarization in high collision frequency and luminosity future electron ion colliders.
Geometry tagging is an experimental analysis technique for selecting event samples where we can, on a statistical basis, control the geometry of the collision in order to make more incisive physics measurements. This technique has been heavily exploited in heavy ion (AA) collisions at RHIC and the LHC, and played an essential role in the discovery and detailed characterization of the quark...
The recent PEPPo (Polarized Electrons for Polarized Positrons) experiment at the
Thomas Jefferson National Accelerator Facility did open an easy and low-cost access
to polarized positron beam through the efficient production of polarized positrons
from the bremsstralhung radiation of a MeV polarized electron beam. The application
of this technique in the context of the upgraded CEBAF...
Energy-frontier DIS can be realised at CERN through an energy recovery linac that would produce 60 GeV electrons to collide with the HL-LHC or, eventually, with the HE-LHC or the FCC hadron beams. It would deliver lepton-proton/nucleus collisions with center of mass energies in the range 0.8-3.5 TeV per nucleon, and luminosities exceeding $10^{34}$ ($5\times 10^{32}$) cm$^{-2}$s$^{-1}$ in ep...
Parton densities PDFs are most important objects both from a fundamental point of view, for characterising the partonic content of hadrons and nuclei, and for the application of collinear factorisation in hadronic and nuclear collisions. Nuclear PDFs are greatly unknown, compared to those in the proton, due to the scarcity of experimental data. In this talk I will first review the present...
Prospects for high precision determination of PDFs and alpha_s are presented, including results from HL-LHC, FCC, LHeC and EIC.
The LHeC and the FCC-eh at CERN are projected machines that will deliver ep (ePb) collisions with center-of-mass energies in the TeV range and luminosities of order $10^{34}$ ($5 \times 10^{32}$) cm$^{−2}$s$^{−1}$. In this talk the possibilities for small-x physics and diffraction will be reviewed, with emphasis on recent results on the extraction of diffractive parton densities.
COMPASS at CERN, a facility designed to perform research in the hadron partonic structure and hadron spectroscopy, is now planning its future beyond 2020. After a brief summary of achieved results the presentation will focus on the COMPASS programme, planned between CERN accelerator long shutdowns 2 and 3: measurements of SSA using the muon beam on a transversely polarised deuteron target and...
The recently completed 12 GeV upgrade of Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF) has established a unique worldwide capability for the precision study of a variety of inclusive, semi-inclusive, and exclusive reactions in deep inelastic electron-nucleon and electron-nucleus scattering. The near-doubling of CEBAF's maximum electron beam energy to 11 GeV (for...
Jefferson Lab recently completed an electron beam energy upgrade from 6 to 11 GeV. New experiments to study the structure of the nucleon have begun collecting data or are under preparation. The presentation will give an overview of the available detectors and targets in the three experimental halls and outline their experimental programs to image the nucleon three-dimensionally.
Jefferson lab's (JLab) CEBAF (now upgraded CEBAF12) accelerator's fixed target experiments give an unique opportunity to study a wide range of phenomena in nuclear medium using Deep Inelastic Scattering (DIS) measurements. Particularly CLAS Eg2 experiment, where different types of nuclei were exposed to electron beam, have provided important information for nuclear hadronization, hadronic and...
We consider lepton-jet correlations in deep inelastic scattering (DIS) as a unique probe of the nucleon/ nuclei tomography. We demonstrate the relevant QCD factorization in terms of transverse momentum dependent quark distributions (TMDs), soft functions and jet functions associated with the final state jet. All relevant large logarithms are resummed to next-to-leading logarithmic (NLL) order....
The potential of the future electron-proton collider facilities LHeC and FCC-eh for electroweak (EW) physics is studies using simulated neutral-current and charged-current DIS cross section data.
These measurements will allow for high precision determinations of the parameters of the EW theory, such as the weak boson masses and the couplings of the light quarks to the Z boson. The potential...
In this talk we present an overview of top physics at two possible future electron-proton (ep) colliders at the high energy frontier, the LHeC and the FCC-eh. Selected topics include but are not limited to top structure function, top parton distribution functions, top spin polarization, top electric charge, measurement of Vtb, anomalous ttg, ttZ, tbW, tqg, tqH couplings and CP phase
of ttH...
The LHeC and the FCC-eh at CERN are projected machines that will deliver ep collisions with center-of-mass energies in the TeV range and luminosities of order $10^{34}$ cm$^{−2}$s$^{−1}$. In this talk, new results will be presented on future precision Higgs SM properties in these machines, as well as new prospects for searches for exotic Higgs related phenomena in ep collisions at high energies.
The LHeC and the FCC-eh at CERN are projected machines that will deliver ep collisions with center-of-mass energies in the TeV range and luminosities of order $10^{34}$ cm $^{-2}$s$^{-1}$. In this talk, new results will be presented on prospects for BSM searches in both machines.
The Belle II experiment is a substantial upgrade of Belle detector and will operate at the SuperKEKB energy-asymmetric $e^+e^-$ collider. The accelerator has successfully completed the first phase of commissioning; collisions will start early April 2018. The design luminosity is $8 \times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50...
The Compact Linear Collider (CLIC) is a proposed high-luminosity linear
electron-positron collider operated at energies from the top pair
production threshold up to 3 TeV. With its high luminosity and flexible
collision energy CLIC offers a wide spectrum of possible physics research,
from precision measurement of Standard Model parameters to searches for
new particles and new physics...
We perform a study on the direct measurement of $\rm V_{td}$ and $\rm V_{ts}$ CKM matrix elements, at the electron proton colliders, through W boson and bottom quark associated production channel as well as W boson and jet associated production channel. The W and bottom(jet) final states can be produced by s-channel single top decay or t-channel top exchange. We find even at the current LHC...
Exclusive vector meson electroproduction over a broad $Q^2$ range offers a unique opportunity to probe the gluon structure of nuclei to measure nuclear shadowing, and to search for gluon saturation and/or the colored glass condensate at an Electron-Ion Collider. Understanding the kinematic distributions and cross sections for specific processes can impact detector design to maximize their...
The potential of the future electron-proton collider facilities LHeC and FCC-eh for electroweak (EW) physics is studies using simulated neutral-current and charged-current DIS cross section data.
These measurements will allow for high precision determinations of the parameters of the EW theory, such as the weak boson masses and the couplings of the light quarks to the Z boson. The potential...
