selected results and future perspectives for tmd ......selected results and future perspectives for...
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June-2-2016 QCD Evolution 2016, For the COMPASS Collaboration, Matthias Perdekamp, UIUC 1
Selected Results and Future Perspectives for TMD Observables at
CERN with COMPASS
COMPASS at CERN: unique capability of measuring TMD
observables with lepton beams (SIDIS)
and hadron beams (Drell-Yan)
Transverse Momentum Dependent PDFs
Single Spin Asymmetries in SIDIS from COMPASS
Constraining Boer Mulders-, Sivers- and Transversity-distributions
Drell-Yan at COMPASSSet-up
Data taking in 2014 and 2015
Plans for 2016-2018
First Steps towards the future: COMPASS 2020
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COMPASS at the CERN SPS
June-2-2016 Selected TMD Results from COMPASS 2
Broad physics program between COMPASS I and II
Studies of nucleon spin structure with longitudinally and transversely polarized 6LiD and NH3 targets in DIS, SIDIS and Drell-Yan processes.
SIDIS and exclusive reactions with lq hydrogen targets.
Hadron Spectroscopy and Primakov Reactions with hadron beams and unpolarized targets.
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June-2-2016 Selected TMD Results from COMPASS 3
Bochum, Bonn (ISKP & PI), Erlangen, Freiburg, Mainz, TU München
UIUC
Saclay
Tel Aviv
Calcutta (Matrivian)
Torino(University,INFN),
Trieste(University,INFN)
Warsawa (NCBJ), Warsawa (TU)Warsawa (U)
CERN
YamagataPraha (CU/CTU)
Liberec (TU)
Brno (ISI-ASCR)
Дубна (LPP and LNP),
Москва (INR, LPI, State University), .
Протвино
Lisboa/Aveiro
Taipei (AS)
COMPASS Collaboration
~250 physicists from 24 institutions in 13 countries
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COMPASS – Important Instrumentation Features
June-2-2016 Selected TMD Results from COMPASS 4
1.Muon, electron or hadron secondary beams with the momentum range 20-250 GeV and intensities up to 108 particles per second.
2. Solid state polarized targets, NH3 or 6LiD, as well as liquid hydrogen target and nuclear targets.
3.Powerful tracking system – 350 planes.
4. Versatile PID – RICH Muon Walls, Calorimeters.
Two staged large acceptance spectrometerswith high rate capability:
RHIC based hadron ID
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June-2-2016 Selected TMD Results from COMPASS 5
COMPASS – Important Instrumentation Features
Solenoid 2.5TDipole magnet 0.6T
3He – 4He dilution refrigerator (T~50mK)
d (6LiD) p (NH3)Polarization 50% 90%Dilution factor 40% 16%
Opposite polarization in different target segmentsreversed frequently
Vertex distribution for SIDIS
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Transverse Momentum Dependent Quark Distribution Functions at Leading Twist
June-2-2016 Selected TMD Results from COMPASS 6
similar for gluons
from Acardi et al. arXiv:1212.1701
Boer-Mulders
Sivers
Transversity
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TMD Modulations in the SIDIS and Drell-Yan Cross Sections
June-2-2016 Selected TMD Results from COMPASS 7
'
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Modulation Amplitudes vs TMDs
June-2-2016 Selected TMD Results from COMPASS 8
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Kinematic Coverage: SIDIS vs Drell-Yan
01/09/16 Selected TMD Results from COMPASS 9
The phase space for Drell-Yan and SIDISprocesses partially overlap in the x-Q2 plane
In the region of overlap in x, the average Q2 inDrell-Yan is about two times larger compared to SIDIS
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Transverse Momentum Dependencein the Unpolarized Cross Section
01/09/16 Selected TMD Results from COMPASS 10
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Hadron Multiplicities vs x,Q2, z and phT
0.2<z<0.3
01/09/16 Selected TMD Results from COMPASS 11
2005 6LiD data, COMPASS preliminary at Spin 2014
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01/09/16 Selected TMD Results from COMPASS 12
2004 6LiD target data
COMPASS, Nucl. Phys. B886 (2014)1046
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01/09/16 Selected TMD Results from COMPASS 12
2004 6LiD target data
COMPASS, Nucl. Phys. B886 (2014)1046
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01/09/16 Selected TMD Results from COMPASS 13
Data at different Q2 (and from Drell-Yan) will help to isolate BM contributions
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15
Extraction of Transversity Distributions and Determination of the Tensor Charge
Transversity, δq(x)Tensor Charge
Th
eor y
SIDIS
~ δq(x) x CFF(z)~ δq(x) x IFF(z)
e+e-
~ CFF(z1) x CFF(z2)~ IFF(z1) x IFF(z2)
pp jets
~ G(x1)xδq(x2) x CFF(z)
pp h+ + h- + X~ G(x1)xδq(x2) x IFF(z)
πp l+ + l- +X Drell-Yan~ h1
⊥(x1) x δq(x2)
Lattice QCD: Tensor Charge = Σq=u,d∫0
1δq(x)dx
COMPASS
01/09/16 Selected TMD Results from COMPASS
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Collins Asymmetries for Pions on Proton Targets
01/09/16 Selected TMD Results from COMPASS 16
COMPASS Phys.Lett. B744:250(2015)
Combined 2007 and 2010 proton data samples analyzed.
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Transversity & Tensor Charge Extracted with TMD Evolution and Recent Data Sets
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Z.-B. Kang., A. Prokudin, P. Sun, F. Yuan - Phys.Rev. D93 (2016) 1, 014009
Data sets from SIDIS(HERMES, JLab, COMPASS)and e+e- (Belle, BaBar)
Fit describes data sets well!
01/09/16 Selected TMD Results from COMPASS
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Transversity and the Tensor Charge Extracted Using TMD Evolution and Recent Data Sets
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Z.-B. Kang., A. Prokudin, P. Sun, F. Yuan - Phys.Rev. D93 (2016) 1, 014009
Favored and unfavoredCollins FF
up and down transversity distributions
Results given at Q2=2.4, 10 and 1000 GeV2
01/09/16 Selected TMD Results from COMPASS
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Transversity and the Tensor Charge Extracted Using TMD Evolution and Recent Data Sets
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Z.-B. Kang., A. Prokudin, P. Sun, F. Yuan - Phys.Rev. D93 (2016) 1, 014009
up and down contributions to tensor charge
Integrals in data region
Integrals in [0,1]
01/09/16 Selected TMD Results from COMPASS
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2 Hadron IFF Asymmetries
Combined 2007 and 2010 proton data samples analyzed.Good agreement to prediction based on fit to Collins data.
COMPASS, Phys. Lett. B736 (2014)124
2001/09/16 Selected TMD Results from COMPASS
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Sivers Asymmetries for π,K and K0
CO
MP
AS
S P
hys
.Let
t. B
744 :
250(
201 5
)
Combined 2007 and 2010 proton data samples analyzed.
2101/09/16 Selected TMD Results from COMPASS
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Sivers Asymmetries for π+ vs K+
COMPASS Phys.Lett. B744:250(2015)
Kaon asymmetries slightly larger Compared to pion? Evidence for sea contribution?
Combined 2007 and 2010 proton data samples analyzed.
2201/09/16 Selected TMD Results from COMPASS
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COMPASS and HERMES Sivers Asymmetries for π+ vs K+
COMPASS Phys.Lett. B744:250(2015)
Combined 2007 and 2010 COMPASS proton data samples analyzed.
2301/09/16 Selected TMD Results from COMPASS
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Sivers – Global Analysis of HERMES & COMPASS Data
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Leading order analysisFull QCD analysis including TMD evolution
Still significant errors, no data for x>0.35 J-Lab 12 GeVSign Change COMPASS Drell-Yan (NSAC Milestone …)
01/09/16 Selected TMD Results from COMPASS
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Sivers Asymmetries on 6LiD and NH3 for Gluons
2501/09/16 Selected TMD Results from COMPASS
XVI Workshop on High Energy Spin Physics (D-SPIN2015) IOP Publishing Journal of Physics: Conference Series 678 (2016) 012055
Krzysztof Kurek and Adam Szabelskifor the COMPASS collaboration
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Sign Change of Sivers- and Boer-Mulders Functions Between SIDIS and DY
Direction of the gauge-link integrals of kT dep. pdfs is process-dependent and changes its sign between SIDIS and DY
Direction of the gauge-link integrals of kT dep. pdfs is process-dependent and changes its sign between SIDIS and DY
Need to confirm sign reversal in polarized Drell-Yan!
NSAC performanceMilestone HP13 for2015
TEST “modified” universality of TMD pdfs!
Sivers
Boer-Mulders
SIDIS DY
2601/09/16 Selected TMD Results from COMPASS
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Instrumentation Updates for Drell-Yan Physics
June-2-2016 Selected TMD Results from COMPASS 27
Polarized TargetHadron Absorber
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2014 Drell-Yan Pilot Run: Di-Muon Mass Spectrum
• Short Pilot Run in 2014 (~2 weeks of stable data taking)
• No polarization
• Beam intensity up to 8x107 /s
• No vertex detector
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Z- coordinates vertex distribution, Mμμ > 4 GeV
01/09/16 Selected TMD Results from COMPASS 29
2014 Drell-Yan Pilot Run:Vertex Distribution
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2014 Drell-Yan Pilot Run: Resulting Analyses
(1) Study of nuclear effects based on Al and
W-targets will improve precision of existing
information on EMC effect.
(2)Improve precision on testing the
Lam Tung sum rule
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First Polarized Drell-Yan Run - 2015
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COMPASS Run Plan and Planning for Future Physics and Upgrades
June-2-2016 Selected TMD Results from COMPASS 32
1.2016-2017 – Two years of exclusive physics with muon beams on liquid hydrogen targets
2. 2018 – Drell-Yan with transversely polarized target NH3
2016 – use series of workshops to formulate physics program for 2020 and beyond:
(1) COMPASS Workshop: Beyond 2020, March 21-22, 2016 at CERN Initial survey of ideas for SIDIS, exclusive physics, hadron spectroscopy and Drell-Yan. (2) COMPASS Internal Study Groups. (3) Physics Beyond Colliders, September 6-7, 2016, CERN.
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Physics at the SPS M2-Beamline – Beyond 2020
June-2-2016 Selected TMD Results from COMPASS 33
First ideas were formulated for a document submitted to the European Strategy Preparatory Group in 2012. This document will be updated with ideas and result of the present workshopsand study groups ..
spectroscopy
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A Speculative Example: Physics with RF Separated Pion, Kaon and Anti-Proton Beams?
Kaon and Anti-Protons Flux possibly reaching 107p./s
June-2-2016Selected TMD Results from COMPASS
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Pion and Kaon Structure from Drell-YanUsing a Hydrogen Target
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Use anti—proton beam and CPT to get p-BMF,
Use pion and kaon beams to study meson structure! UnpolarizedOr first comparison of Meson andBaryon BMF and first comparisonof BMF for different mass mesons.
beamBMF
targetBMF
June-2-2016 Selected TMD Results from COMPASS
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Consider Possible Addition of a Recoil Detector to the Polarized Target for Exclusive Physics
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Initial ideas and first workby Dubna (I. Savin), Munich(J. Friedrich) and at CERN (F. Gautheron and A. Magnon)
Ideas and SuggestionWill be Welcome!
June-2-2016Selected TMD Results from COMPASS
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Summary:COMPASS continues massive data taking for Drell-Yan and exclusive physics through 2018. Analyses of SIDIS, exclusive processes, Drell-Yan Data and hadron spectroscopy is in full swing.
For the next 10 years • before any collider is available, • and complementary to Jlab 12 GeV
COMPASS@CERN aims to continue as a major player in QCD physics using its unique high energy
• hadron- and muon beams.
Looking even further…a polarized lepton-nucleon Looking even further…a polarized lepton-nucleon collider appears to be a mandatory tool for collider appears to be a mandatory tool for achieving further progress!achieving further progress!
June-2-2016Selected TMD Results from COMPASS