Introduction and Status of W physics in PHENIX

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Introduction and Status of W physics in PHENIX Muon Arms Chong Kim Korea University

Introduction and Status of W physics in PHENIX Muon Arms Chong Kim Korea University 1 / RIKEN 2 1 Department of Physics, Korea University, Seoul 136 -713, South Korea 2 -1 Hirosawa, Wako, Saitama 351 -0198, Japan 2 RIKEN, for the PHENIX collaboration

2/ Outline 1. Physics motivation 2. PHENIX Muon Arms a. W physics b. Forward

2/ Outline 1. Physics motivation 2. PHENIX Muon Arms a. W physics b. Forward upgrade 3. W → μ analysis a. Get W likelihood b. Composing PDFs for fit c. S/BG ratio estimation d. Single spin asymmetry (AL) 4. Summary and Perspective

3/ 1. Physics motivation From RHIC Spin whitepaper for the NSAC Subcommittee

3/ 1. Physics motivation From RHIC Spin whitepaper for the NSAC Subcommittee

4/ 2. PHENIX Muon Arms – a. W physics νㅣ l+

4/ 2. PHENIX Muon Arms – a. W physics νㅣ l+

5/ 2. PHENIX Muon Arms – b. Forward upgrade μ • Muon Arm detectors:

5/ 2. PHENIX Muon Arms – b. Forward upgrade μ • Muon Arm detectors: FVTX, Mu. TR, Mu. ID, and RPCs • Forward μ trigger upgrade: • 35 cm steel absorber: reduce low momentum punch-through hadrons • Mu. TR ADTX (electronics) upgrade: fast determination of high momentum tracks • RPCs: additional timing & rough position

6/ 3. W → μ analysis – a. Get W likelihood W signal μ

6/ 3. W → μ analysis – a. Get W likelihood W signal μ backgrounds MC simulation (PYTHIA + PISA) χ2, DCAr, Rpc 1 DCA, Rpc 3 DCA, DG 0, DDG 0 (preselected signal-sensitive kinematic variables) data Compose 1 st PDFs (Probability Density Function): λ = p(χ2) · p(DCAr) · p(Rpc 1 DCA) · p(Rpc 3 DCA) · p(DG 0, DDG 0) W likelihood DDG 0 Mu. TR St 1 y Track Rpc 3 DCA DG 0 x Rpc 1 DCA DCAr RPC 1 Mu. TR Mu. ID RPC 3

7/ 3. W → μ analysis – a. Get W likelihood South Arm, W

7/ 3. W → μ analysis – a. Get W likelihood South Arm, W - → μ- • Luminosity scaled Entries vs. W likelihood • Data: Run 12, pp 510, Int. L 43 (pb-1) • Signal: PYTHIA + PISA simulation, W + Z • Signal + μ backgrounds: PYTHIA + PISA simulation, Direct γ, onium, Opencharm, Openbottom, W had, W tau, and Z (to had/tau) • (Rough) Hadronic backgrounds

 3. W → μ analysis – b. Composing PDFs for fit W MC

3. W → μ analysis – b. Composing PDFs for fit W MC μ BG Preselected kinematic variables data 1 st PDFs by each variables W likelihood Scale each sample by luminosity Define variables for fit: η and dw 23 then collect samples satisfying W likelihood cut (ex. > 0. 92) dφ23 * dw 23 (reduced azimuthal bending) ≡ p. T × sin θ × dφ23 Projection to η A. U W MC, South Arm, W - → μdw 23 Projection to dw 23 η Mu. TR St 3 A. U 8/ y η dw 23 Mu. TR St 2 θ z x

9/ 3. W → μ analysis – b. Composing PDFs for fit W MC

9/ 3. W → μ analysis – b. Composing PDFs for fit W MC μ BG Preselected kinematic variables data 1 st PDFs by each variables W likelihood Scale each sample by luminosity Define variables for fit: η and dw 23 then collect samples satisfying W likelihood cut (ex. > 0. 92) dw 23 ≡ p. T × sin θ × dφ23 Compose 2 nd PDFs by using η and dw 23: λ signal (η, dw 23) by W MC λ μ BG (η, dw 23) by μ background MC λ Hadronic BG (η, dw 23) by driven from data Compose combined PDF: λ final → perform unbinned maximum likelihood fit Total data composition - Size: surviving events - Green: W events - Violet: μ BG - Cyan: Hadronic BG

10/ 3. W → μ analysis – c. S/BG ratio estimation

10/ 3. W → μ analysis – c. S/BG ratio estimation

11/ 3. W → μ analysis – d. Single spin asymmetry (AL)

11/ 3. W → μ analysis – d. Single spin asymmetry (AL)

12/ 4. Summary and Perspective

12/ 4. Summary and Perspective

B Backup – Forward μ trigger upgrade Resistive Plate Chamber (RPC) (φ segmented) Trigger

B Backup – Forward μ trigger upgrade Resistive Plate Chamber (RPC) (φ segmented) Trigger events with straight track (e. g. Dstrip <= 1) Trigger Level 1 Trigger Board RPC FEE Mu. TRG Data Merge Amp/Discri. Transmit 5% Mu. TRG ADTX Mu. TRG MRG 1. 2 Gbps Trigger 2 planes B Optical Trigger 95% RPC / Mu. TRG data are also recorded on disk Mu. Tr FEE Interaction Region Rack Room

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B Backup Ref. 368630 (low) pytune 100 k factor # of gen events (M)

B Backup Ref. 368630 (low) pytune 100 k factor # of gen events (M) x-section (mb) luminosity (pb-1) data (common) dy (direct photon) light onium openbottom opencharm w whad wjet wtau z zjet zonly 1. 5 1. 5 N/A 11600 311. 1 32910 1552 145940 65. 1 120 11. 9 118 81. 5 11. 9 0. 000001 N/A 5. 32 E-002 5. 94 E+001 1. 35 E-001 7. 30 E-003 5. 71 E-001 1. 66 E-006 1. 20 E-006 1. 66 E-006 1. 59 E-005 1. 02 E-006 1. 33 E-007 43 218. 0 0. 0 243. 8 212. 6 255. 6 39216. 9 72289. 2 9916. 7 71084. 3 5125. 8 11666. 7 0. 0 # of gen events (M) x-section (mb) luminosity (pb-1) N/A 48510 152 69790 4489 250830 451. 2 335 13. 3 346 253. 7 13. 2 136. 8 N/A 5. 32 E-002 5. 94 E+001 1. 35 E-001 7. 30 E-003 5. 71 E-001 1. 66 E-006 1. 20 E-006 1. 66 E-006 1. 59 E-005 1. 02 E-006 1. 33 E-007 43 911. 8 0. 003 517. 0 614. 9 439. 3 271807. 2 201807. 2 11083. 3 208433. 7 15956. 0 12941. 2 1028571. 4 # of gen events (M) x-section (mb) luminosity (pb-1) N/A 6400 193. 6 55470 4003 134220 173. 4 81 8. 2 82 245. 2 8. 2 106. 5 N/A 5. 32 E-002 5. 94 E+001 1. 35 E-001 7. 30 E-003 5. 71 E-001 1. 66 E-006 1. 20 E-006 1. 66 E-006 1. 59 E-005 1. 02 E-006 1. 33 E-007 43 120. 3 0. 003 410. 9 548. 4 235. 1 104457. 8 48795. 2 6833. 3 49397. 6 15421. 4 8039. 2 800751. 9 Ref. 367466 (mid) pytune 100 data (common) dy (direct photon) light onium openbottom opencharm w whad wjet wtau z zjet zonly 1. 5 1. 5 Ref. 367593 (high) pytune 100 data (common) dy (direct photon) light onium openbottom opencharm w whad wjet wtau z zjet zonly 1. 5 1. 5

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