BNL Minjung Kim for the PHENIX Collaboration (SNU/RIKEN) RBRC Workshop: Emerging Spin and Transverse Momentum Effects in p+p and p+A Collisions

Content 2 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

3 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

PHENIX Forward Neutron Detector 2 nd ZDC SMD x 7 channels (x) 8 channels (y) Centroid of shower Y (cm) X (cm) 10 cm x 10 cm Neutron position 4 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

X Y 5 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

HIGH ENERGY POLARIZED PROTON-PROTON COLLISIONS 6 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

Published: PRD 88, (2013) Unexpected asymmetry before the measurements RHIC IP12 experiment (2002) PHENIX with dedicated neutron detectors (2006) 7 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

10/19/15JAPAN KOREA PHENIX COLLABORATION SEOUL PRD 84, (2011)

02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS 9 p ↑ p Forward Neutron A N Spin flip Neutron proton Spin non-flip Neutron proton  : phase shift ++ a1a1

Approach Cross section description Details 10/19/15JAPAN KOREA PHENIX COLLABORATION SEOUL Theoretical Development PRD 84, (2011)

HIGH ENERGY POLARIZED PROTON-NUCLEUS COLLISIONS 11 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

The First Attempt to Measure Asymmetries in pA Collision GeV Au, Al 2015 (Run15) Proton 100GeV/nucelon

13 Atomic Mass Dependence PRD 84, (2011) The first attempt in Run15 (2015) at RHIC.

14 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

Ideas for A dependence 15 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

Naïve expectation Z:1, N: 0 Z:13, N:14 Z:79, N: /10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS Isospin Asymmetry?

QED Process Ultra Peripheral Collision (UPC) neutron t → 0 A A p p  n p 17 In pAu case ↑ p A   Z2Z2  EM ↑  n 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

15/11/18 東北大学 ELPH セミナー 18

Neutral 200GeV UPC Monte Carlo 19 ZDC Predicts comparable yields between QCD and UPC processes QCD(DPMJET) UPC (SOPHIA)

Full Description For pp:  : relative phase of amplitudes Elastic (polarimeter)

Can we identify UPC events? 21 BBC    ZDC Dipole n  + Most of decayed pions go through BBC hole and will be swept away by the dipole magnet (DX). Simulation by Gaku Mitsuka Very little coincidence measurements of final state from resonance. BBC  + Rapidity   distribution of n+  + events Itaru’s slide 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

22 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS ZDC inslusive UPC enhanced UPC suppressed

Coulomb-Nuclear Interference  p A n  A Pion cloud t → 0 p A n   Z2Z2  A Same Final State  P Huge rapidity interval, not the case for UPC?

Summary 24 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

Thank you! 25 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

Forward Neutron Angular Distributions 26 PHENIX ZDC  x ~ 1cm LHCf  x ~ a few mm The ZDC acceptance doesn’t reach QCD dominant region.

LHC 27 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

28 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS