In the Standard Model of Physics (SM) associated with every conservation law there exists a symmetry. While no such symmetry associated with conservation of charge lepton flavors (CLF) has been identified, we still have not observed its experimental violation.Evidence for CLF violation (CLFV) would hence mean existence of physics Beyond the SM (BSM) and is of high interest. The recently...
Dark Photons have been proposed across a variety of mass scales in order to address anomalies in precision measurements and to provide a window into the dark sector. Over the past decade, many experiments have probed and ruled out dark photons in the most promising regions of the parameter space for simple models. However, the majority of these searches rely on hadronic production modes...
We study the potential of future Electron-Ion Collider (EIC) data to probe four-fermion operators in the Standard Model Effective Field Theory (SMEFT). The ability to perform measurements with both polarized electron and proton beams at the EIC provides a powerful tool that can disentangle the effects from different SMEFT operators. We compare the potential constraints from an EIC with those...
We quantify the potential impact of unpolarized lepton-proton and lepton-nucleus inclusive DIS cross sections measured at the Electron-Ion Collider (EIC) on the unpolarized proton and nuclear Parton Distribution Functions (PDFs). To this purpose we include neutral- and charged-current DIS pseudodata in a coherent set of global PDF determinations based on the NNPDF methodology. We find that the...
As we strive for higher precision Standard Model predictions, a
detailed knowledge of the PDFs is critical to interpret hadronic
processes at LHC and EIC. New data from both proton and heavy ion
beams can impose improved PDF constraints, as well as provide insights
as to the optimal means to organize the QCD expansion. The recently
released updates of the nCTEQ15 nPDFs reflect some of...
The EIC will provide a powerful tool for discriminating between various models of exotic hadron structure. Exotics that hadronize inside the nucleus must pass through nuclear matter, where they can interact with other partons and be disrupted. The magnitude of this disruption is expected to depend on the radius/binding energy of the state. Thus, the nucleus can act as a filter that...
We present explorative analyses of the 3D gluon content of the proton via a study of (un)polarized twist-2 gluon TMDs, calculated in a spectator model for the parent nucleon. Our approach encodes a flexible parametrization for the spectator-mass density, suited to describe both moderate and small-$x$ effects. All these prospective developments are relevant in the investigation of the gluon...
The tensor charge is one of the fundamental charges of the nucleon and, arguably, the least known. This quantity sits at the intersection of three key areas of nuclear physics: 3-dimensional tomography of the nucleon, searches for beyond the Standard Model physics, and lattice QCD. In this talk I will report on a recent study of the impact of the Electron-Ion Collider (EIC) on the...
In semi-inclusive deep-inelastic scattering (SIDIS), the observables can be written in terms of two contributions: nucleon structure (i.e. the way partons are arranged in nucleons, encoded in the Transverse-Momentum Dependent Parton Distributions - TMD PDFs) and the mechanism of hadronization (encoded in the TMD Fragmentation Functions - TMD FFs). A reliable extraction of the former requires a...
We present the leading-twist parton distribution functions (PDFs) of the $\rho$-meson in the light-front holographic model which are found to be in accord with the Nambu-Jona-Lasinio (NJL) model and the light-front quark model predictions. We further study the QCD evolution of the PDFs. The positivity bounds on the PDFs are also discussed.
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We calculate the cross section of inclusive dijet photoproduction in electron-nucleus scattering in the kinematics of the EIC using next-to-leading order (NLO) perturbative QCD and nCTEQ15 and EPPS16 nuclear parton density functions (nPDFs). We establish kinematic reaches in the distributions in the dijet average transverse momentum, the average rapidity, the observed nuclear and photon...
The energy loss mechanism of jets plays a central role in nuclear and high energy physics. We propose direct measurements of the energy loss of leading jets and perform a calculation at next-to-leading logarithmic (NLL$'$) accuracy in the vacuum. The formation of leading jets can be described by jet functions which constitute probability densities and thus allow for a perturbative calculation...
We present a phenomenological analysis of the experimental data from Belle Collaboration for the transverse polarization of Lambda's measured in $ e^+ e^- $ annihilation processes, both for the case of associated and inclusive (plus a jet) production. We extract for the first time, within a TMD approach, the quark polarizing fragmentation function for a Lambda hyperon, a distribution giving...
We investigate photo-production of vector mesons J/Psi and Psi(2s), based on both HERA and LHC data, using 2 fits of unintegrated gluon distributions. The latter are subject to non-linear Balitsky-Kovchegov evolution (Kutak-Sapeta gluon; KS) and linear next-to-leading order Balitsky-Kuraev-Fadin-Lipatov evolution (Hentschinski-Sabio Vera-Salas; HSS gluon) respectively. Apart from extending...
Inclusive measurements of back-to-back dijets/dihadrons in deeply inelastic scattering (DIS) present a promising channel to access signatures of gluon saturation inside nuclear matter at the future Electron Ion Collider (EIC). While most phenomenological studies have been performed within the powerful TMD factorization framework, there are important kinematic (perturbative power) and genuine...
To understand gluon polarization inside a polarized nucleon is one of the most important physics goals of the future EIC proposed at Brookhaven National Laboratory. In addition to the extraction of such information by a QCD fit on the polarized g1 structure functions, another direct measurement on gluon polarization via double spin asymmetries in the open charm production through photon-gluon...
The proposed high luminosity high energy Electron-Ion Collider (EIC) will provide a clean environment to precisely study the nuclear modification of the nuclear parton distribution functions (nPDFs) and hadronization processes within a wide x-$Q^{2}$ phase space. Heavy flavor hadron and jet measurements at the future EIC will allow us to better determine the nPDFs in the poorly constrained...
The heavy-flavor program for the future Electron-Ion Collider (EIC) at Brookhaven National Laboratory offers many potential measurement opportunities probing the nucleon structure and cold nuclear medium effects with electron-proton(ion) collisions. Among many other interesting topics, a particular expected achievement is the improvement to the gluon nuclear parton distribution function from...
We explore the feasibility of the measurement of charm-jet cross
sections in charged-current DIS at the EIC. This channel provides clean sensitivity to the strangeness content of the nucleon in the high-x region. We show the expected sensitivity to various strange PDFs, and hence this measurement will be key to future QCD global analyses.
An important part of the physics program at the future electron-ion collider is to understand the nature of hadronization and the transport of energy and matter in large nuclei. Open heavy flavor production in deep inelastic scattering provides a new tool to address these critical questions. We present the first calculation of D-mesons and B-meson cross sections in electron-nucleus collisions...
In high energy collisions, heavy quarks (c, b) are predominately produced in the initial hard scattering process. The relative ratio of different heavy flavor hadrons species serves as a tool to study charm quark hadronization mechanism. Recently, data from $p$+$p$, $p$+A, and A+A collisions at RHIC and LHC showed that the $\Lambda_c^+/D^0$ ratio is considerably larger than the fragmentation...
Using Soft-Collinear Effective Theory, we develop the transverse-momentum dependent factorization formalism for heavy flavor dijet production in polarized-proton electron collisions. We consider heavy flavor mass corrections in the collinear-soft and jet functions, as well as the associated evolution equations. Using this formalism, we generate a prediction for the gluon Sivers asymmetry for...
Heavy quark production in deep inelastic scattering proceeds via the Boson Gluon Fusion process and thus provides constraints to the gluon distributions inside the nucleon/ion probed. Measurements of charm and anti-charm hadron pair production in deep inelastic scatterings can be used to probe the gluon transverse momentum dependent distributions (TMDs) in the nucleon/ion. In this talk we will...
Droplets of quark-gluon plasma produced in heavy-ion collisions rapidly evolve expanding and cooling. During considerable part of this dynamics the system can be described within relativistic hydrodynamics. Recently, there were some attempts to include effects of the medium motion to the jet energy loss and jet modification calculations in a variety of models. Here we will present the first...
The EIC provides exciting new possibilities to study heavy exotic candidates in photoproduction. Here I provide a summary of current JPAC work to provide estimates of production rates of key exotic candidates such as the X(3872) and Y(4260) at EIC kinematics.
State-of-the-art detectors are required to fulfill the challenging physics program of the future Electron-Ion Collider (EIC). Specifically, a hermetic, low-material-budget, compact tracker with excellent momentum and pointing resolution capabilities is needed. The experience gained with semiconductor detectors in previous colliders indicates that this technology is one of the best options to...
We investigate photo-production of vector mesons J/Psi and Psi(2s), based on both HERA and LHC data, using 2 fits of unintegrated gluon distributions. The latter are subject to non-linear Balitsky-Kovchegov evolution (Kutak-Sapeta gluon; KS) and linear next-to-leading order Balitsky-Kuraev-Fadin-Lipatov evolution (Hentschinski-Sabio Vera-Salas; HSS gluon) respectively. Apart from extending...
The EIC will provide a powerful tool for discriminating between various models of exotic hadron structure. Exotics that hadronize inside the nucleus must pass through nuclear matter, where they can interact with other partons and be disrupted. The magnitude of this disruption is expected to depend on the radius/binding energy of the state. Thus, the nucleus can act as a filter that...
Quasi parton distribution functions (PDFs) are related to the matrix elements of bilocal operators with space-like separation. The possibility to calculate these objects on the lattice has attracted much attention in the QCD community. I will present the behavior of quark and gluon quasi-PDFs at low-x.
Inclusive measurements of back-to-back dijets/dihadrons in deep inelastic scattering (DIS) present a promising channel to access signatures of gluon saturation inside nuclear matter at the future Electron-Ion Collider (EIC). While most phenomenological studies have been performed within the powerful TMD factorization framework, there are important kinematic (perturbative power) and genuine...
