EIC opportunities for Snowmass

25 Jan 2021, 10:00 → 29 Jan 2021, 16:00 US/Eastern

Online

Abhay Deshpande (Stony Brook University), Ciprian Gal (Stony Brook University), Swagato Mukherjee (BNL), Yen-Jie Lee (Massachusetts Institute of Technology)

The goal of this workshop is to summarize and document Electron Ion Collider (EIC) related science that have been discussed within the SnowMass2021 process so far. An updated and expanded version of this document based on the future discussions will eventually become the summary of the EIC related contributions to SnowMass2021.

Due to the COVID-19 virus, we will hold the workshop online using Zoom. Link: https://mit.zoom.us/j/96805844190?pwd=cGg5eWVYTEtlQ0hEWWsrR3N0Q09YUT09

This event is part of the CFNS workshop/ad-hoc meeting series. See the CFNS conferences page for other events.

Program Committee: Yulia Furletova, Ciprian Gal, Claire Gwenlan, Salvatore Fazio, Timothy Hobbs, Alexey Prokudin, Alessandro Vicini, Miguel Arratia, Zhong-Bo Kang, Stefan Prestel, Ivan Vitev, Xin Dong, Stephen Sekula, Tuomas Lappi, Soeren Schlichting, Renaud Boussarie, Bjoern Schenke,

Advisory Committee: Michael Begel, Stefan Hoeche, Michael Schmitt, Huey-Wen Lin, Pavel Nadolsky, Christophe Royon

Monday, 25 January

11:00 → 15:00 EW & BSM: Day 1

Conveners: Ciprian Gal (Stony Brook University), Claire Gwenlan (Oxford), Yulia Furletova (Jefferson Lab)

Recording

11:00 Introduction

Speaker: Yen-Jie Lee (Massachusetts Institute of Technology)

20210125-yenjie-Snowmass-EICWorkshop_v1.pdf

11:10 Overview of LOI contributions

Speaker: Ciprian Gal (Stony Brook University)

210125_EW&BSM@EIC_Summary.pdf

11:30 Search for Charged Lepton Flavor Violation at the Electron-Ion Collider

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 approved Electron-Ion Collider (EIC) at BNL with 100-1000 times higher high luminosity than HERA (at DESY, German) will provide a unique new opportunity for such a search. In contrast with the CLFV transition between the $e$ and $\mu$ for which very stringent limits exist, there is still relatively large discovery space for the CLFV transition between the $e$ and $\tau$ within EIC’s reach. With the modern detector designed for the EIC, $\tau$s created in e-p scattering at the EIC are expected to be identified with high efficiency. In this talk, we will present results from an ongoing study of sensitivity possible for $e \rightarrow \tau$ conversion in e-p scattering at the EIC.

Speaker: Jinlong Zhang (Shandong University)

clv_snowmass_etautransition.pdf

11:40 Prospects for Dark Photons at EIC

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 which, in some models, are significantly suppressed. The EIC's asymmetric beam energies offer a unique collision kinematics to mount a search for dark photons through purely leptonic production and decay modes. I will discuss the prospects for this measurement and a brief review of other related studies that can be undertaken at the EIC.

Speaker: Ross Corliss (SBU)

eic_dark_photons.2021.01.25.pdf

11:50 Removing flat directions in SMEFT fits: how polarized electron-ion collider data can complement the LHC

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 obtained from Drell-Yan data at the Large Hadron Collider. We show that EIC data plays an important complementary role since it probes combinations of Wilson coefficients not accessible through available Drell-Yan measurements.

Speaker: Daniel Wiegand (Northwestern University/Argonne National Lab)

12:00 Plans for proceedings

Tuesday, 26 January

11:00 → 15:00 Hadron tomography at EIC and HEP

Conveners: Alessandro Vicini (University of Milano), Alexei Prokudin (Penn State Berks), Salvatore Fazio (Brookhaven National Laboratory), Timothy Hobbs (Southern Methodist University and EIC Center@JLab)

Recording

11:00 Welcome and summary of Snowmass aims

Speaker: Prof. Huey-Wen Lin (Michigan State University)

Lin_EIC-Snowmass-Workshop.pdf

11:05 A self-consistent determination of proton and nuclear PDFs at the Electron Ion Collider

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 EIC could reduce the uncertainty of the light quark PDFs of the proton at large values of the momentum fraction x, and, more significantly, of the quark and gluon PDFs of nuclei, especially of heavy ions, at small and large x. We illustrate how the improved precision of nuclear PDFs can impact predictions for the interaction of ultra-high energy cosmic neutrinos with matter.

Speaker: Juan Rojo (VU Amsterdam)

rojo-EIC-snowmass.pdf

11:20 Improved constraints on nPDFs with nCTEQ

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 these advances.
These efforts, together with complementary approaches such as Lattice
QCD, will contribute toward incisive comparisons of data with theory
as we validate our understanding of the Standard Model and search for
deviations which might signal evidence of “new physics.”

Speaker: Fredrick Olness (SMU)

olness_pdfs.pdf

11:35 Probing the structure of exotic hadrons at the EIC

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 preferentially suppresses extended states, while allowing compact states to pass through relatively unscathed. We will present a brief discussion of these effects and early projections for suppression of the exotic tetraquark candidate X(3872).

Speaker: Matt Durham (Los Alamos National Laboratory)

Durham_EIC_Snowmass_workshop.pdf

11:50 3D proton tomography at the EIC: TMD gluon densities

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 dynamics inside nucleons and nuclei, which constitutes one of the major goals of new-generation colliding machines, as the Electron-Ion Collider (EIC).

Speaker: Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN-TIFPA)

talk_SM_EIC_opp_January_2021_Celiberto.pdf

12:05 Quarkonium production and gluon TMDs at the EIC

Speaker: Pieter Taels (Ecole Polytechnique)

EIC Snowmass 260121 Pieter Taels.pdf

12:20 EIC Impact Study on the Tensor Charge using TMDs from a Global Analysis of SSAs

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 phenomenological extraction of the tensor charge from a QCD global analysis of single transverse-spin asymmetries (SSAs). We generated EIC pseudo-data for the Collins effect in semi-inclusive deep-inelastic scattering for proton and He-3 beams across multiple center-of-mass energies. We find a significant reduction in the uncertainties for the up, down, and isovector tensor charges that will make their extraction from EIC data on SSAs as or more precise than current lattice QCD calculations.

Speaker: Daniel Pitonyak (Lebanon Valley College)

Pitonyak_Snowmass_Workshop_FlashTalk.pdf

12:35 Toward a universal definition of TMD Fragmentation Functions

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 detailed knowledge of the latter. In this regard, one of the cleanest processes from which we can gather information about TMD FFs is single hadron production in $e^+e^-$ annihilation, with the jet axis being reconstructed. Unfortunately, the usual TMD factorization cannot be directly applied to this process. We present a factorization scheme that allows to write a proper factorization theorem for such cross section, restoring the possibility to perform global phenomenological studies of TMD physics by providing a framework in which SIDIS and $e^+e^-$ data can be combined together.

Speaker: Andrea Simonelli (University of Torino and INFN Torino)

SnowmassEIC.pdf

12:50 Light-front holographic $\rho$-meson parton distribution functions

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.

                               -- WITHDRAWN --

Speaker: Ms Satvir Kaur (Dr BR Ambedkar National Institute of Technology, Jalandhar)

13:05 Coffee

13:15 Discussion toward Snowmass proceedings

Speaker: Timothy Hobbs (Southern Methodist University and EIC Center@JLab)

EIC-Snowmass_tomog_workshop_Jan-2021.pdf

Wednesday, 27 January

11:00 → 15:00 Jets at EIC

Conveners: Miguel Arratia (University of California, Riverside), Zhongbo Kang (UCLA)

Recording

11:00 Introduction

Speaker: Pavel Nadolsky (Southern Methodist University)

EICWkshpDay3.pdf

11:10 High dimensional jet measurements

Speaker: Benjamin Nachman

EICWorkshop.pdf

11:35 Jets at the EIC

Speaker: Felix Ringer (UC Berkeley/LBNL)

Snowmass_EIC_FRinger.pdf

12:00 Jets for longitudinal spin physics

Speaker: Frank Petriello (Northwestern University)

petriello-Snowmass.pdf

12:25 Virtual Coffee Break

https://www.wonder.me/r?id=400d77cc-93e4-4433-b9d6-dd8d084981b8
[Use the above wonder.me link for a coffee break, to get an informal chat with your friends.]

12:45 TMD structure at the EIC using jets

The understanding of the fragmentation process is important as it will provide us with a deep insight into the elusive mechanism of hadronization. In recent years, observation of hadron inside jets has become important observable to understand and extract fragmentation functions. In this flash talk, I will demonstrate the usefulness of studying hadron distribution inside jets and how its framework can be generalized to include polarization.

Speaker: Kyle Lee (LBNL)

EIC_snowmass_21.pdf

12:55 Cold Nuclear Matter effect on jet production at electron-ion colliders

Jet production and jet substructure at the election-ion collider play an essential role in revealing the nuclear structure and the the evolution of parton showers in cold nuclear matter. We present the theoretical study of inclusive jet cross section and jet charge with the cold nuclear matter effects at the EIC in the framework of soft-collinear effective theory with medium interactions. For the inclusive jet cross section we present the modification in electron-gold collisions in relative to electron-proton collisions, as well as its $R$ dependence. We also provide the predictions of average jet charge for up-quark jet and inclusive jets. We demonstrate theoretically how to disentangle the effects from nuclear parton-distribution functions and the ones from strong interactions between cold nuclear matter and jet.

Speaker: Haitao Li (NU & ANL)

jet_EIC.pdf

13:05 Dijet photoproduction in lepton-nucleus scattering at the EIC

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 momentum fractions and also examine the sensitivity of the calculated dijet cross section to nuclear modifications of nPDFs.

Speaker: Vadim Guzey (Petersburg Nuclear Physics Institute)

guzey_eic_snowmass_2021.pdf

13:15 Leading jets and energy loss at the EIC

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 of the average the energy loss. We identify the following three criteria for a direct measurement of jet energy loss at the cross section level. $i)$ We measure a well defined object, the leading jet, where the formation process can be expressed in terms of a probability density. $ii)$ In addition, we need a measurement of a hard reference scale with respect to which jet energy loss is defined. $iii)$ At leading logarithmic accuracy, we require that the jet energy loss can be identified with parton energy loss. We discuss suitable observables at the Electron-Ion Collider and present numerical results including threshold corrections by making use of a parton shower Monte Carlo approach.

Speaker: nobuo sato (Jefferson Lab)

EIC-snowmass.pdf

13:25 Extraction of the $ \Lambda $ Polarizing Fragmentation Function from Belle $ e^+ e^- $ data

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 the probability that an unpolarized quark fragments into a transversely polarized spin-1/2 hadron. Similar analyses in $ e \, P \rightarrow e \, \Lambda + X $ processes at the EIC will be crucial for understanding the universality and evolution properties of the TMD polarizing FF.

Speaker: Marco Zaccheddu (Università degli studi di Cagliari & INFN)

EIC_SM_Marco_Zaccheddu.pdf

13:35 summary and plan

Speaker: Zhongbo Kang (UCLA)

Jets at the EIC (1).pdf

Thursday, 28 January

13:00 → 16:00 Gluon saturation at EIC

Conveners: Bjoern Schenke (BNL), Renaud Boussarie (Los Alamos National Lab), Soeren Schlichting (University of Washington), Tuomas Lappi (University of Jyvaskyla)

Recording

13:00 Introduction

Speaker: Swagato Mukherjee (BNL)

13:10 Gluon saturation and spin physics: a window into axion-like dynamics

We discuss a novel effective action that captures the interplay of hadron spin and gluon saturation in the Regge limit of QCD . In particular, we discuss an emergent axion like dynamics that is mediated by sphaleron transitions. This indicates a window in the strong interactions with formal connections to axion dynamics in dark matter and radiation, and to the role of sphaleron dynamics in B+L violation in the early universe.

Speaker: Raju Venugopalan (BNL)

Snowmass_flash-talk_RV.pdf

13:20 Spin at small x

Speaker: Yuri Kovchegov (The Ohio State University)

Snowmass2021.pdf

Snowmass2021.pptx

13:30 J/Psi and Psi(2s) production as a probe of low x evolution

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 previous studies to the case of radially excited charmonium Psi(2s), we further use an improved set of charmonium wave functions and provide an estimate of the uncertainties associated with the HSS gluon. While we observe that the difference between linear and non-linear evolution somehow diminishes and a clear distinction between both HSS and KS gluon is no longer possible using the currently available data-set, we find that the differences between both gluon distributions are enhanced for the ratio of the photo-production cross-sections of Psi(2s) and J/Psi vector mesons.

Speaker: Martin Hentschinski (Universidad de las Americas Puebla)

eic_sm0121.pdf

13:40 The impact of gluon saturation in forward dijet/dihadron measurements at the EIC

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 saturation corrections that must be resummed for more controlled phenomenological predictions. The Color Glass Condensate (CGC) is a suitable framework that resums both kinds of contributions.
In this talk, I will present our results for inclusive diparton production in proton and nuclear DIS at leading order in the CGC. Our numerical results are compared to the TMD framework for a wide range of kinematics accessible at the future EIC. We find that both kinematic and genuine saturation corrections are significant and could be accessed in dijet and dihadron measurements.

Speaker: Farid Salazar (Stony Brook University)

snowmass_dijet.pdf

13:50 Deeply Virtual Compton Scattering at Small-x

Speaker: Feng Yuan (Lawrence Berkeley National Laboratory)

DVCS.pptx

14:00 Prospects for diffraction at the EIC

Speaker: Anna Stasto (Penn State University)

anna_stasto_eic_diffr.pdf

14:10 Update on Gluon Saturation in EIC Yellow Report

Speaker: Tuomas Lappi (University of Jyvaskyla)

snowman_eicyr21.pdf

14:20 Overview of other topics in LOI and discussion of writing process

Speaker: Bjoern Schenke (BNL)

EIC_sat_snowmass CFNS.pdf

Friday, 29 January

11:00 → 15:00 Heavy flavor at EIC

Conveners: Ivan Vitev (LANL), Stephen Sekula (SMU), Stephen Sekula (Southern Methodist University), Xin Dong (Lawrence Berkeley National Laboratory)

11:00 Introduction

SnowmassCNFS.pdf

11:10 Measuring gluon polarization in the nucleon via open charm production at the EIC

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 fusion process is proposed. In this talk, the idea of such measurement and simulation studies at the EIC will be presented.

Speaker: Dr Yuxiang Zhao (Institute of Modern Physics, Chinese Academy of Sciences)

Yuxiang_EIC_opencharm.pdf

11:20 Open heavy flavor and jet studies for the future Electron-Ion Collider

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 high Bjorken-x region and provide enhanced sensitivities to the nuclear transport properties in medium.Studies of flavor tagged hadrons or jets and their correlations at the EIC provide a unique path to explore the flavor dependent fragmentation functions and energy loss in heavy nuclei, which can constrain the initial state effects for previous and ongoing heavy ion measurements at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). We will present recent results of heavy flavor hadron and jet reconstruction in simulation and the corresponding physics projection such as the flavor dependent hadron nuclear modification factor in electron+nucleus collisions. Initial design and performance of a proposed forward (proton/nuclei going direction) silicon tracking detector, which is essential to carry out these measurements at the EIC will be shown as well.

Speaker: Dr Xuan Li (Los Alamos National Laboratory)

EIC_snowmass_HF_LANL_v2.pdf

11:30 Studies of Open Charm Hadron Reconstruction at the EIC and Implications for Charm Structure Functions

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 the measurement of the charm structure functions. In this presentation, we will present the studies of open heavy-flavor hadrons in a wide kinematic region using simulated electron-proton collisions in PYTHIA with detector performance based on a silicon-based tracker for the future EIC detector. We study the reconstruction of open charm hadrons and the effects of using secondary vertex reconstruction to suppress backgrounds including the impacts of primary vertex resolution. The impact of the expected statistical precision on charm structure functions with the nominal projected integrated luminosity will be discussed.

Speaker: Matthew Kelsey

Kelsey_EICSnowMass.pdf

11:40 Charm as a probe for strangeness at the EIC

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.

Speaker: Fredrick Olness (SMU)

olness_HeavyFlavor.pdf

11:50 Heavy meson tomography of cold nuclear matter at the electron-ion collider

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 at the EIC by including both next-to-leading order QCD corrections and cold nuclear matter effects. Our formalism employs generalized DGLAP evolution to include the contribution of in-medium parton showers, and is based on methods developed in soft-collinear effective theory with Glauber gluons that describe inclusive hadron production in reactions with nucleons and nuclei. The comprehensive study summarized here allows us to identify the optimal observables, center-of-mass energies, and kinematic regions most sensitive to the physics of energy loss and hadronization at the EIC.

Speaker: Zelong Liu (LANL)

HF_EIC_Snowmass.pdf

12:00 $\Lambda_c$ baryon production at future EIC

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 baseline. The high luminosity e+p and e+A collisions in the future Electron-Ion Collider (EIC) at Brookhaven National Laboratory would allow us to systematically investigate the $\Lambda_c$ production over a broad kinematic region, which will shed detail insights on charm hadrochemistry and charm-quark hadronization. In this talk, I will present the reconstruction capability study for $\Lambda_c^+$ baryons at the future EIC experiment utilizing an all silicon tracker based on next generation MAPS technology. Physics projections on the measurement of $\Lambda_c^+/D^0$ ratio in e+p collisions in the future EIC will be presented.

Speaker: Yuanjing Ji (LBNL)

EIC_Lc_flash.pdf

12:10 QCD evolution of the gluon Sivers function in heavy flavor dijet production at the EIC

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 the charm and bottom dijet production at the future Electron-Ion Collider. Furthermore, we compare theoretical predictions with and without the inclusion of finite quark masses. We find that the heavy flavor mass effects can give sizable corrections to the predicted asymmetry.

Speaker: Dr Dingyu Shao (UCLA)

shao_5m.pdf

12:20 Probing gluon distributions with heavy quark pairs at the EIC

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 discuss open charm hadron pair reconstruction studies with an all silicon detector design for a future Electron Ion Collider (EIC) experiment, and utilizing them for measuring the TMDs. Statistical uncertainty projections for physics observables in both polarized and unpolarized collisions at the EIC will be
discussed.

Speaker: Sooraj Radhakrishnan (Kent State Univ./Lawrence Berkeley National Laboratory)

SnowmassEICDDbar.pdf

12:30 In-medium fluctuations in the GLV formalism

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 principle consideration of the medium motion effects on the jet broadening and soft gluon radiation within the GLV approximation. We will show that the developed formalism can be also applied to derive the effects of in-medium fluctuations on a wide range of the jet observables at EIC.

Speaker: Andrey Sadofyev (Los Alamos National Laboratory)

SnowMass01292020.pdf

12:40 Exotic Spectroscopy @ EIC studies from JPAC

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.

Speaker: Daniel Winney (Indiana University)

spec_EIC.pdf

12:50 Design and Performance of an All-Silicon Tracker for the Electron Ion Collider

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 satisfy the EIC tracking requirements. We have designed and studied an all-silicon tracker prototype using the GEANT-based Fun4All simulation package. This tracker is hermetic for |η| < 3.5 and satisfies the projected material-budget requirements for an EIC tracker. Resolutions were studied by generating different particles from the nominal interaction point over the entire detector acceptance and up to momenta of 25 GeV/c and reconstructing them with
the detector concept embedded in 1.4 and 3.0 T solenoidal magnetic fields. Jets resolutions were also studied from electron-proton collisions using the PYTHIA 8 event generator. We compared the momentum-resolution performance of the tracker with the requirements outlined by the EIC physics working groups and identified phase-space regions where the tracker out-performs the requirements. In regions where the requirements are more stringent than the tracker performance, we studied potential options to enhance the performance.

Speaker: Dr Reynier Cruz Torres (Lawrence Berkeley National Laboratory)

210129_RCT_Snowmass_v2.pdf

13:00 Discussion and Summary