Jet measurements at the EIC
Felix Ringer Lawrence Berkeley National Laboratory
RHIC & AGS Annual users meeting, BNL — 10/22/2020 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions The Electron-Ion Collider
January 9, 2020
• High luminosity 33 34 2 1 10 cm s • Center-of-mass energy ps = 20 140 GeV • Highly polarized beams • Electron-proton/nucleus collisions
… 2010 2015 2018 2020
2 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions The EIC science program
• The spin and mass of the proton • 3D imaging • Parton distribution functions Transverse momentum (TMDs) and position (GPDs)
1 1 = ⌃(Q2)+ G(Q2)+L (Q2)+L (Q2) 2 2 q g 1 1 = ⌃(Q2)+ G(Q2)+L (Q2)+L (Q2) ~ 2 2 q g
• Small-x and saturation • Hadronization • Nuclear modification in eA collisions
3 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions The EIC science program with jets
Jets as tools to realize the EIC science goals — Recent publications
• The spin of the proton, PDFs Hinderer, Schlegel, Vogelsang `15, `17, Abelof, Boughezal, Liu, Petriello `16, Boughezal, Petriello, Xing `18, Aschenauer, Chu, Page `19, Guzey, Klasen `18, `20, Borsa, Florian, Pedron `20, `20, Arratia, Furletova, Hobbs, Olness, Sekula `20
• 3D nucleon/nucleus tomography Zheng, Aschenauer, Lee, Xiao, Yin `18, Liu, FR, Vogelsang, Yuan `19, Gutierrez-Reyes, Scimemi, Waalewijn, Zoppi `19, Hatta, Mueller, Ueda, Yuan `19, Arratia, Kang, Prokudin, FR `20, Kang, Liu, Mantry, Shao `20, Castillo, Echevarria, Makris, Scimemi `20
• Saturation, a new form of gluon matter Hatta, Xiao, Yuan `17, Salazar, Schenke `19, Roy, Venugopalan `19, Kang, Liu `19 Kolbe, Roy, Salazar, Schenke, Venugopalan `20
• Hadronization and quarks and gluons in the nucleus Klasen, Kovarik `18, Aschenauer, Lee, Page, FR `19, Qin, Wang, Zhang `19, Arratia, Song, FR, Jacak `19, Li et al. `20, Barata, Mehtar-Tani, Soto-Ontoso, Tywoniuk `20, Li, Vitev `20
4 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions The EIC science program with jets total number of EIC jet papers
• There have been many new developments recently! • Prominently featured in the EIC Yellow Report
5 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions Jets at the EIC
Jet transverse momentum Number of particles
Relatively low energies, need good control of hadronization corrections
Clean environment — no Multi Parton Interactions (MPI)
6 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions Jets at the EIC Q2 > 100 GeV2, ps = 89 GeV e 10 initial proton particle momentum initial proton Hadron Struck quark Jets Jets are excellent proxies of parton level kinematics Clean separation of current & target fragmentation (UE) Complementary to observables with hadrons Arratia, Jacak, FR, Song `19 Laboratory frame Pythia 8 see also Aschenauer, Chu, Page `19 7 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions The QCD fragmentation process • Fragmentation functions de Florian, Epele, Hernandez-Pinto, Sassot, Stratmann `15 10 pT = 100 GeV 8 ) • Jet functions R T 6 R =0.7 z,p ( g 4 J 2 Kang, FR, Vitev `16 0 Dai, Kim, Leibovich `17 0 0.2 0.4 0.6 0.8 1 Neill, FR, Sato `20 z = pT /pˆT 8 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions Outline • Introduction • Inclusive and leading jets • TMDs measurements with jets • Hadronization and cold nuclear matter • Conclusions 9 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions Jet clustering and frame dependence • Laboratory frame e0(k0) e(k) Can measure two variables 2 2 2 2 Q =(k k0) • Jet transverse momentum pT ,Q• Photon virtualitypT ,Q 2 Leading electronpT ,Q 2 pT ,Q • Cluster jets in the laboratory frame ⌘, • Leading-order eq eq ! 10 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions Jet clustering and frame dependence e0(k0) • Laboratory frame e(k) 2 2 2 Measure only p T ,,Q close analogy to pp jet + X Q =(k k0) ! NLO NNLO 2 pT ,Q Hinderer, Schlegel, Vogelsang `15 Abelof, Boughezal, Liu, Petriello `16 11 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions Jet clustering and frame dependence e0(k0) • Laboratory frame e(k) 2 2 2 Measure only p T ,,Q close analogy to pp jet + X Q =(k k0) ! Double longitudinal spin asymmetries qi , g 2 ~e + p~ jet + X ~e + p~ e +jet+X pT ,Q ! ! NLO Boughezal, Petriello, Xing `18 Borsa, Florian, Pedron `20 see also Hinderer, Schlegel, Vogelsang `17 12 Introduction Inclusive and leading jets TMDs Hadronization & CNM Conclusions Jet clustering and frame dependence Arratia, Makris, Neill, FR, Sato `20 • Breit frame 2 • Photon virtualitypT ,Q • Jet energy Inclusive jets Breit frame ps = 63 GeV ,Q>10 GeV Pythia