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Transverse Momentum Dependent Evolution in Proton-Proton Collisions Oleg Eyser RIKEN/BNL Research Center Workshop Emerging Spin and Transverse Momentum.

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Presentation on theme: "Transverse Momentum Dependent Evolution in Proton-Proton Collisions Oleg Eyser RIKEN/BNL Research Center Workshop Emerging Spin and Transverse Momentum."— Presentation transcript:

1 Transverse Momentum Dependent Evolution in Proton-Proton Collisions Oleg Eyser RIKEN/BNL Research Center Workshop Emerging Spin and Transverse Momentum Effects in p+p and p+A Collisions

2 2 The Evolving Proton spin structure QCD What about spin effects, in particular those that naturally include transverse momentum dependence? Our picture of the proton changes with the resolution.

3 3 Transverse Momentum Dependent Effects Twist-3 Effects Transverse-Spin Asymmetries Hadronization Parton Distribution Spin-Orbit Correlation Transversity What underlying process creates transverse-spin asymmetries?

4 Is the observed p T -dependence consistent with theory? What can we learn about non-DGLAP evolution effects? 5 Transverse Momentum Dependent Effects Twist-3 Effects

5 5 Phys Rev D86, 014028 (2012)

6 6

7 7 TMD evolutionTwist-3 evolution PDF evolution non-perturbative part is empirical input for evolution kernel Phys Rev D86, 014028 (2012)

8 8 Ideally…

9 9 Meanwhile in the real world

10 6 Polarization Effects in Nucleon / Parton Inclusive hadrons Direct photons Jets Jet structure Hadron correlations Interference fragmentation Drell-Yan W-bosons quark ULT nucleon U L T quark ULT hadron U L T Possible transverse asymmetries: initial state final state

11 10 Inclusive Jets AnDY @ RHIC PRL 110, 232301 (2013)

12 19 Gluon Spin-Orbit Correlation Phys. Rev. D90, 012006 (2014)

13 13 Fragmentation Effects

14 11 Event Topology

15 12 Event Topology

16 13 Jet Event Topology Forward-central correlation: FMSEMC

17 15 Factorization & Universality SIDIS Drell-Yan Compare SIDIS and Drell-Yan production expect a sign-change in the asymmetry from spin-orbit correlations Non-universality of Sivers function (and others) Phys. Rev. Lett. 110, 232301 (2013)

18 18 The Other Gauge Boson arXiv: 1401.5078 arXiv: 1511.06003

19 19 More W-Bosons in 2017… DIS data

20 23 Di-Hadron Fragmentation PRL 115, 242501 (2015) Collinear description with valid factorization

21 24 Di-Hadron Fragmentation 200/500 GeV preliminary

22 20 Asymmetries in Jets

23

24 22 Comparison 200/500 GeV No strong effect of TMD evolution observed Additional data at 200 GeV from 2015 Proposed run at 500 GeV in 2017 → S. Bazilevsky

25 18 Direct Photons PHENIX MPC-EX STAR FPS/FMS PRL 110, 232301 (2013)

26 25 Cold Nuclear Matter → R. Seto & C. Dilks

27 PROTON transversity spin-orbit correlation TMD evolution QCD universality TMD framework factorization Summary

28

29 7 AGS LINAC BOOSTER Polarized Source 200 MeV Polarimeter Hydrogen Jet Polarimeter PHENIX STAR Siberian Snakes Carbon Polarimeters AGS pC Polarimeter Strong Snake Tune Jump Quads Helical Partial Snake Spin Rotators Spin Flipper

30 8

31 31

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