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

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Presentation on theme: "BNL Minjung Kim for the PHENIX Collaboration (SNU/RIKEN) RBRC Workshop: Emerging Spin and Transverse Momentum Effects in p+p and p+A Collisions."— Presentation transcript:

1 2016-02-10 @ BNL Minjung Kim for the PHENIX Collaboration (SNU/RIKEN) RBRC Workshop: Emerging Spin and Transverse Momentum Effects in p+p and p+A Collisions

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

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

4 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

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

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

7 Published: PRD 88, 032006 (2013) Unexpected asymmetry before the measurements Discovered @ RHIC IP12 experiment (2002) Measured @ PHENIX with dedicated neutron detectors (2006) 7 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS

8 10/19/15JAPAN KOREA PHENIX COLLABORATION WORKSHOP @ SEOUL PRD 84, 114012 (2011)

9 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

10 Approach Cross section description Details 10/19/15JAPAN KOREA PHENIX COLLABORATION WORKSHOP @ SEOUL Theoretical Development PRD 84, 114012 (2011)

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

12 The First Attempt to Measure Asymmetries in pA Collision 12 100GeV Au, Al 2015 (Run15) Proton 100GeV/nucelon

13 13 Atomic Mass Dependence PRD 84, 114012 (2011) The first attempt in Run15 (2015) at RHIC.

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

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

16 Naïve expectation Z:1, N: 0 Z:13, N:14 Z:79, N: 118 16 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS Isospin Asymmetry?

17 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

18 15/11/18 東北大学 ELPH セミナー 18

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

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

21 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 22 02/10/16 RBRC WORKSHOP: EMERGING SPIN AND TRANSVERSE MOMENTUM EFFECTS IN PP AND P+A COLLISIONS ZDC inslusive UPC enhanced UPC suppressed

23 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?

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

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

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

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

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

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