ANDY

A 3-year program to establish requirements for forward Drell-Yan production for future

STAR/PHENIX upgrades, and to measure the analyzing power for Drell-Yan production in

transversely polarized proton collisions.L.C.Bland, for AnDY11 January 2011Time Meeting, BNL

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E.C.Aschenauer, A. Bazilevsky, L.C. Bland, K. Drees, C. Folz, A.Gordon, Y. Makdisi, A.

Ogawa, P. Pile, T.G. ThroweBrookhaven National Laboratory, Upton, NY

H.J. Crawford, J.M. Engelage, E.G. JuddUniversity of. California, Berkeley/Space

Sciences Laboratory, Berkeley, CA

C.W. PerkinsUniversity of. California, Berkeley/Space

Sciences Laboratory, Berkeley, CA / Stony Brook University, NY

A. Derevshchikov, N. Minaev, D. Morozov, L.V. Nogach

Institute for High Energy Physics, Protvino, Russia

G. Igo, S. TrentalangeUniversity of California, Los Angeles, Los

Angeles, CA

ANDY membersM. Grosse Perdekamp, A. Vossen

University of Illinois, Urbana-Champaign, IL

M.X. LiuLos Alamos National Laboratory, Los Alamos,

NM

H. AvakianThomas Jefferson National Accelerator

Facility, Newport News, VA

E.J.BrashChristopher Newport University and TJNAF

C.F.PerdrisatCollege of William and Mary

V. PunjabiNorfolk State University

Li, XuanShandong University, China

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Motivation

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xF Dependence of Inclusive 0 ANRHIC Run 6 with Forward Pion Detector

Fits to SIDIS (HERMES) are consistent with p+p→+X data

AN at positive xF grows with increasing xF

PRL 101, 222001 (2008)arXiv:0801.2990 [hep-ex]

U. D’Alesio, F. MurgiaPhys. Rev. D 70, 074009 (2004)arXiv:hep-ph/0712.4240

C. Kouvaris, J. Qiu, W. Vogelsang, F. Yuan, Phys. Rev. D 74, 114013 (2006).

STARSTAR

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Present Understanding

Large spin effects observed for forward pion production at RHIC result from

• (mostly from) orbital motion of quarks and gluons within proton

• Color-charge interactions

ANDY will test present understanding by measuring the sign of the analyzing power for Drell-Yan production.

Theory expects this sign to be opposite to that observed in semi-inclusive deep inelastic scattering.

Observing this sign change establishes “like color charge repel” and “unlike color charges attract” for QCD.

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Schematic of detector for Run-11Equipment in place:• HCal is two existing 9x12 modules from

E864 (NIM406,227)

• ECal are two small lead-glass modules from BigCal at JLab

• BBC (from PHOBOS) and ZDC

• Preshower is newly constructed scintillator arrays

Goals:• Establish impact of 3IR operation on

PHENIX/STAR luminosity

• Calibrate HCal

• relative gain via cosmic-ray m

• absolute energy scale via ,KS…

• Measure hadronic backgrounds to benchmark simulations

• Measure jet analyzing power (Lint~10 / pb, P=50%)

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Schematic of detector for Run-12(PHOBOS split-dipole expected to be in place, but not used)

http://www.star.bnl.gov/~akio/ip2/topview2.jpeg

Equipment in place:• Hcal is existing 9x12 modules from E864 (NIM406,227)

• Ecal is modeled as only (3.8cm)2x(45cm) lead glass

• construct 2nd layer of PS

• borrow/stage 1744-element lead-glass BigCal from JLab

Goals:

• Measure AN for DY without magnet (Lint~150 / pb, P=50%)

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Schematic of detector for Run-13(Uses PHOBOS Split Dipole for charge sign)

http://www.star.bnl.gov/~akio/ip2/topview_run13.jpeg

Equipment in place:• HCal is existing 9x12 modules from E864 (NIM406,227)

• ECal is modeled as only (3.8cm)2x(45cm) lead glass

• PHOBOS split-dipole magnetic field in GEANT model

• Fiber tracker stations and MWPC require construction

Goals:• Measure AN for DY with magnet (Lint~150 / pb, P=50%)

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IP2 in August, 2010Remnants of the BRAHMS Experiment

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IP2 in January, 2011Run-11 Staging of ANDY

See http://hena.lbl.gov/IP2/Business/status/<date> for pictures of progress

Left/right symmetric HCal

Left/right symmetric ECal

Left/right symmetric preshower

Trigger/DAQ electronics

Blue-facing BBC

Beryllium vacuum pipe

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Many Thanks to C-AANDY Liason Physicist: Angelika DreesANDY Liason Engineer: Charles FolzGroup Coordinator: Fred Kobasiuk

Experimental Services Group:Supervisor: John WhiteLarry Arnold Rob KarlEd Debrowski Matt CegliaCharlie Bloxson

Carpenters: Jim Johnsen Mike Demers

Electricians:Supervisor: Neil Waide Jeremy Salvia Bob Hoogsteden Mike Devany Joe Summers Kevin Wish James Folk John Prussen

ZDC preparations (including SMD): Tony Curcio Steven Jao George Mahler Dysart Ravenhall Paul Ziminski Joe Citro Jim Kelly

Riggers:Supervisor  Alex Korol  Arthur Anderson James Sadloski Roy Johnson Dane De Fio Jeff Tabacco Robert Medina

Survey:Supervisor: Frank Karl Doug Gordon Ed Ulrich

Vacuum Group:Group Leader: Mike Mapes Robert Todd

Optical fibers: Charlie Theisen Warren Jappe John Pepe Pete Zimmerman Larry Carboni Ralph Schoenfeld

Others who worked hard!Contact me at bland@bnl.gov, if I missed you