Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session E06: Minisymposium: 3D Nucleon Structure II |
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Chair: Alexei Prokudin, Penn State Berks Room: Hilton Waikoloa Village Queens 5 |
Wednesday, November 29, 2023 7:00PM - 7:15PM |
E06.00001: Overview of Recent Jet Measurements in Deep-Inelastic Scattering with AI/ML Unfolding and the H1 Detector Miguel I Arratia
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Wednesday, November 29, 2023 7:15PM - 7:30PM |
E06.00002: The azimuthal correlation between the leading jet and the scattered lepton in deep inelastic scattering at HERA Jae D Nam, Bernd Surrow Preliminary results of the measurement of inclusive jet production in deep inelastic $ep$ scattering at HERA collected with the ZEUS detector will be presented. The data feature $e^{pm}p$ collisions at a center-of-mass energy of $sqrt{s} = 318 ;mathrm{GeV}$ for an integrated luminosity of $326 ;mathrm{pb}^{-1}$. The differential cross section has been measured as a function of the azimuthal correlation angle between the scattered lepton and the leading jet. The measurement was performed within the fiducial region, specified in the laboratory frame, given by photon virtuality $10 ;mathrm{GeV}^2 < Q^2 < 350 ;mathrm{GeV}^2$, inelasticity $0.04 < y < 0.7$, outgoing lepton energy $E_e > 10 ;mathrm{GeV}$, lepton polar angle $140^o < heta_e < 180^o$, jet transverse momentum $2.5 ;mathrm{GeV} < p_mathrm{T,jet} < 30 ;mathrm{GeV}$, and jet pseudorapidity $-1.5 < eta_mathrm{jet} < 1.8$. Jets were reconstructed with the $k_mathrm{T}$ algorithm with the radius parameter $R = 1$. The jet carrying the highest $p_mathrm{T,jet}$ within a DIS event was chosen as the leading jet. Perturbative calculations at $O(alpha_{s}^2)$ accuracy and predictions from the ARIADNE color dipole model are compared to the data in order to test the ability of pQCD to describe a wide range of characteristics of the data. |
Wednesday, November 29, 2023 7:30PM - 7:45PM |
E06.00003: Impact of QED Effects in SIDIS: A New Hybrid Factorization Approach Justin Cammarota, Jianwei Qiu, Nobuo Sato The factorization theorem plays an important role in the analysis of high energy quantum chromodynamic (QCD) processes, separating the nonperturbative hadronic interaction into the universal parton distribution functions (PDFs) and fragmentation functions (FFs) and the process-dependent interactions into short distance perturbative calculations, with any interference power suppressed. With a virtual photon exchange, lepton-hadron deep inelastic scattering (DIS) provides an electromagnetic hard probe for the partonic structure of colliding hadron and has played an important role in the development of QCD factorization. However, the collision induced QED radiation can change the momentum of the exchanged but unobserved virtual photon, making the photon-hadron frame, where the factorization formalism for DIS and semi-inclusive DIS (SIDIS) was derived, ill defined. An new analogous factorization approach has been introduced to separate the leading power process-independent QED radiative contributions to the single photon exchange by introducing global lepton distribution functions (LDFs) and lepton fragmentation functions (LFFs), while process-dependent effects are perturbatively calculated with large logarithms removed [J. High Energ. Phys. 2021, 157 (2021)]. These LDFs and LFFs appear in many different interactions, such as e+ e-, DIS and SIDIS. In this talk, I will apply this new hybrid factorization approach to lepton-hadron SIDIS to study the cross-section in two different kinematic regions: (1) the final state lepton and hadron are close to back-to-back, and (2) they are not, where collinear QCD factorization works for (2) and TMD QCD factorization for (1) while collinear QED factorization works for both. I show the effects on the SIDIS cross section using fixed order calculations for the unpolarized structure function by first showing the effect of the radiative corrections on the main kinematic variables, especially how the internal transverse momentum is significantly correlated to the external angular dependence, and then the unpolarized structure function (or cross section) with matching between the descriptions for low and high transverse momentum, using the MAP model for the TMDs and the JAM parameterization for the collinear QCD functions. |
Wednesday, November 29, 2023 7:45PM - 8:00PM |
E06.00004: Measurements of Transverse Spin Dependent $pi^+pi^-$ Azimuthal Correlation Asymmetry and Unpolarized $pi^+pi^-$ Cross Section in $pp$ Collisions at $sqrt s = 200$ GeV at STAR Babu R Pokhrel The transversity distribution function, $h_1^{q}(x)$, encapsulates the transverse spin structure of the proton at the leading twist, where $x$ represents the longitudinal momentum fraction carried by the quark $q$. Extracting $h_1^{q}(x)$ poses a formidable challenge due to its chiral-odd nature. Measurements of final-state dihadron pairs in transversely polarized proton-proton ($p^uparrow p$) collisions directly probe the collinear quark transversity through its coupling with a chiral-odd interference fragmentation function (IFF), $H_1^{sphericalangle, q}$. This coupling leads to an experimentally measurable azimuthal correlation asymmetry, $A_{UT}$. |
Wednesday, November 29, 2023 8:00PM - 8:15PM |
E06.00005: Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in $p^{uparrow}p$ collisions at $sqrt{s} = 510$ GeV at STAR Navagyan Ghimire The transverse polarization of quarks within a transversely polarized nucleon, $h^q_1(x)$, can only be accessed through processes involving its coupling with another chiral-odd function, such as the spin-dependent interference fragmentation function (IFF) in polarized proton-proton collisions. The coupling of $h^q_1(x)$ and IFF leads to a measurable azimuthal correlation asymmetry ($A_{UT}$) of di-hadron pairs in the final state. In previous work, the STAR experiment at RHIC measured a non-zero $A_{UT}$ using polarized proton-proton ($p^uparrow p$) collision data collected in 2011 at $sqrt s = 500$ GeV, with an integrated luminosity of 25 pb$^{-1}$. The precise determination of $A_{UT}$, in conjunction with the measurement of the cross section of unpolarized di-hadron pairs, can help constrain the $h^q_1(x)$ in global analyses. In 2017, the STAR experiment collected a dataset of approximately 350 pb$^{-1}$ from $p^uparrow p$ collisions at $sqrt s = 510$ GeV. This new dataset will significantly enhance the statistical accuracy of the $A_{UT}$ measurement. In this presentation, we will provide an update on the analysis of the $A_{UT}$ measurement for pion pairs in the mid-pseudorapidity region from the STAR 2017 $p^uparrow p$ dataset. |
Wednesday, November 29, 2023 8:15PM - 8:30PM |
E06.00006: Measurements of $W^+$ and $W^-$ cross sections and their ratio in $pp$ collisions at STAR Jae D Nam While the unpolarized valence quark ($d$ and $u$) distributions are well determined from DIS and $pp/par{p}$ experiments, their sea (anti-)quark counterparts, $ar{d}$ and $ar{u}$, are much less constrained, in particular, near the valence region (momentum fraction, $x sim 0.2$). |
Wednesday, November 29, 2023 8:30PM - 8:45PM |
E06.00007: High Transverse Momentum Semi-Inclusive Pion Electroproduction Carl E Carlson Even at moderate energy machines, there is a regime where the highest momentum pion electroproduction proceeds by a perturbatively calculable process. The process is not the leading twist fragmentation one but rather a higher twist process that produces kinematically isolated pions. Semiexclusive data may teach us more about parton distribution functions of the target and the pion distribution amplitude. In addition, there is a connection to generalized parton distribution calculations of exclusive processes in that the perturbative kernel is the same. |
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