Simonetta Liuti University of Virginia Exclusive Processes Workshop Jefferson … · 2010-06-08 ·...
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Deeply Virtual Exclusive Processes with Charm
Simonetta LiutiUniversity of Virginia
Exclusive Processes WorkshopJefferson Lab
May 18-21, 2010
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Outline Preamble
Introduction and Main Goal for an EIC
Hard Exclusive Charmed Mesons Production
⇒ A unique investigation of charm content of nucleons
From JLAB 6-12 GeV to EIC
⇒ Modeling the Q2 dependence of neutral mesonselectroproduction(S. Ahmad, G. Goldstein, S.L., PRD79, 2008; G. Goldstein, S.L., hep-ph2010)
Conclusions/Outlook
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Partonic Interpretation of Generalized Parton Distributions(more at MENU)
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P+
k’+=(ζ-X)P+
P’+=(1- ζ)P+
In ERBL region struck quark, k,is on-shell
H (X,! ,t) = P ' " +n n " P
n
# $ (X %! )P++ p
n
+ % P '+&' ()
k+=XP+
P+
k’+=(X-ζ)P+
P’+=(1- ζ)P+
PX+=(1-X)P+
In DGLAP region spectator with diquark q. numbers is on-shell
Can one give a partonicinterpretation?
See also Goldstein, S.L.PRD(2009)
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No damn cat, and no damn cradle..K. Vonnegut“Cat’s Cradle”
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The next decade…role of QCD at the LHC LHC results from multi-TeV CM energy collisions will open new horizons
but many “candidate theories” will provide similar signatures of adeparture from SM predictions…
Precision measurements require QCD input
QCD: A background for “beyond the SM discovery”
Interesting dynamical questions for QCD at untested high energies
Introduction
! (P1,P
2) = dx
1dx
2fi"i, j# (x
1,µF ) f j (x2 ,µF )!̂ (x1, x2 ,$S (µR ),µF )
Measured x-section Parton distributions Hard process x-section
σij
P2
P1
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2) Rich dynamics of hadrons can only be accessed and tested at thedesired accuracy level in lepton DIS
Most important points for EIC
1) Our understanding of the structure of hadrons is … disconcertingly incomplete
Uncertainties from different PDF evaluations/extractions(ΔPDF)are smaller than the differences between the evaluations(ΔG) ΔPDF < ΔG
d-bar
u-valence d-valence
Gluon
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Our contribution to EIC physics (S.L. with L. Gamberg and G. Goldstein )
Study heavy quark components → charm, through hard exclusive processes
Why charm?
LHC processes are sensitive to charm content of the proton ⇒ Higgs production: SM Higgs, charged Higgs,
⇒ Precision physics (CKM matrix elements, Vtb ….): single top production, …cs !H
+
C.P.Yuan and collaborators
IC! (CTEQ, IC)
! (CTEQ)
IC
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CTEQ 6.6
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Data are at very low x where they cannot discriminate whether IC is there
10-2
x
10-3
IC/no-IC
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-ηc, Do, and Do exclusive production is governed by chiral-odd soft matrixelements (⇒ Generalized Parton Distributions, GPDs) which cannotevolve from gluons!
ηc, Do, and Do used as triggers of “intrinsic charm content”!
P+
p+q
q q’=q+Δ γ*p → ηcp’
Chiral-odd GPDs: HT,ET,..
ηc, Do, …
A window into heavy flavor production at the EIC
-
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Windows into Heavy Flavor Production at the EIC
c
c
c
c
c
Intrinsic Charm (IC)
Gluon Fusion (GF)
vs.
IC content of proton can be large (up to 3 times earlier estimates) but PDF analyses are inconclusive (J.Pumplin, PRD75, 2007)
Inclusive
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cc
Intrinsic Charm (IC)“Light Cone” based Processes Hadronic Processes
u
ud
p ! uudcc
c
Meson Cloud: Thomas, Melnichouk …
Do
!c
p! Do"
c
Brodsky, Gunion, Hoyer, R.Vogt, …
c
u
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Intrinsic Charm can be “partially” detected by looking atasymmetries in Inclusive Heavy Quark Jets ProductionAnanikian and Ivanov, NPB (2008)
zAIC
LO= 0
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c
c
Do
u
!cp ∝ Hc
Do
!c
cp
u
u∝ Hc
p → u + ud → cud = Λc p → ccuud → (u u) cud = Λc - -
( 2 )( 1 )
What Observables?Spin Asymmetries from Exclusive Heavy Quark Meson Production!
γ*p → Do Λc+ ⇒ 2Hu - Hd + Hc
γ*p → Do Σc+ ⇒ Hd - Hc
γ*n → Do Σco ⇒ Hu - Hc
--
-SU(4) relations allowone to extract Hc
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Slice SU(4) weight diagrams to obtain SU(3) subgroup weight diagrams This replaces u,d,s by u,d,c octet relations
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cp
c
c∝ Hc
p → ccuud → (c c) uud = p -
ηc
p-
( 3 )
EIC “golden plated signal”
ηc= cc → JPC= 0-+-“But measuring ηc is very difficult”Pavel Nadol Turonksi
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Pseudoscalar Mesons Electroproduction and Chiral Odd GPDs(S. Ahmad, G. Goldstein and S.L., PRD (2008))
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LAB
e'
eπo,ηc
Unpolarized Cross Section
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pp0* !" #
Q2 dependence in exclusive mesonproduction
Jlab
Unexpected dominanceof transverse components
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πo
“Regge factorization” QCD factorization
πo vertex is described by current operators: γ5 or γµ γ5 chiral-even structure
γ5 →
chiral-odd structure
GPDs: H, E,…~
~GPDs: HT, ET, HT, ET…
~
~
JPC=1--
JPC=1+-
γ, ρ, ω, ..
b1, h1
Q2 dependence
πo
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Chiral Even Sector: M. Diehl and D. Ivanov (2008)
Only combination good for πo production
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GPDs: H, E, and Weak Form factors~ ~
gP(t) = pseudoscalar form factor → dominated by pion pole
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E~ Goeke et al.
1) For πo production the pion pole contribution is absent!
2) The non-pole contribution is very small!
“non-pole” contribution
pion pole contribution
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πo,ηc electroproduction happens
mostly in the chiral-odd sector
⇒it is governed by chiral-odd GPDs
⇒issue overlooked in most recentliterature on the subject
Since chiral-odd GPDs cannot evolve from gluons we have proven thatηc, Do, and Do uniquely single out the “intrinsic charm content”!
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Helicity Amplitudes formalism
f!" ,!; 0, #!
photon initial proton
final protonpion
Factorized form
P’, Λ’
k’, λ’
P, Λ
k, λ
“quark-proton helicity amp.”γ quark scattering amp.
6 “f” helicity amps
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Rewrite helicity amps. expressions using new GFFs
Q2 dependent pion vertexGFFs
elementary subprocess
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Standard approach (Goloskokov and Kroll, 2009)
γµγ5 ⇒ leading twist contribution within OPE, leads to suppression of transverse vs. longitudinal terms γ5 ⇒ twist-3 contribution is possible
However…⇒ suppression is not seen in experiments
Need to devise method to go beyond the collinear OPE: considera mechanism that takes into account the breaking of rotational symmetry by the scattering plane in helicity flip processes (transverse d.o.f.)
See also
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t-channel exchangevertex
modeled as Fpγ (pseudoscalar-meson transition form factor)
ρ, ω b1, h1 πo
ρ, ω, b1, h1
JPC=1-- (3S1) JPC=1+-(1P1)
JPC=0-+
mesons quark content:
Q2 dependence
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Distinction between ω,ρ (vector) and b1,h1 (axial-vector)exchanges
JPC=1--
JPC=1+-
transition from ω,ρ(S=1 L=0) to πo(S=0 L=0) ΔL =0
transition from b1,h1 (S=0 L=1) to πo(S=0 L=0) ΔL =1
“Vector” exchanges no change in OAM
“Axial-vector” exchanges change 1 unit of OAM!
This yields configurations of larger “radius” in b space (suppressed with Q2)
Because of OAM axial vector transition involves Bessel J1
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Global parametrizations for GPDs...?
The name of the game: Devise a form combining essentialdynamical elements with a flexible model that allows for afully quantitative analysis constrained by the data
Hq(X, ζ, t)= R(X, ζ, t) G(X, ζ, t)
“Regge” Quark-Diquark
+ Q2 Evolution
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Parameters from PDFs
Parameters from FFs
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Preliminary predictions for EIC
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⇒ Replace PDF used for light quarks GPDs with NP charm based one
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HAPPEx+E734 G0 + BNL E734
⇒ Replace FF used for light quarks GPDs with upper limit on charm based one
Pate, McKee, Papavissiliou,PRC78(2008)
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G.Goldstein, S.L. (preliminary)
Ratio ηc/πo
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Finally, spin degrees of freedom
Outstandingpuzzle!
Collinear Factorization
Polarizing Fragmentation Function
Non Collinear Factorization
D. Boer, DIS 2010
Set of all data compiled by K. Heller
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Spin: Problem of Polarization of Hyperons and Charmed Baryonsin pp collisions
p
p → ccuud → (c c) uud = p -
Λc
p
-
What generates polarization?
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1.Gluon fusiondominant mechanismfor producing polarizedmassive quark pair2. Low pT phenomenon3. Recombination rules
Model of hyperon polarization Dharmaratna & GRG (1990,96,99)
PΛ
pT (GeV)
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5/19/10 Antiprotons Trento Jul.07 G.R.Goldstein 41
Charmed hyperon polarization
π+p→ΛC+X Polzn(ΛC) E791
ΛC+→p+ π++K-
Large mass scale
ud
ΛC
anti-c
Λcp
⇔
PΛ
pT (GeV)
Interpretation in new language of GPDs
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Region ofinterest
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Conclusions and OutlookEIC with an extended kinematical coverage (low to “larger” xBj) andwide Q2 range will provide invaluable information on both pdfs(needed for LHC …!!), and basic hadronic properties: nature of charmcontent, quark and gluons spin, transversity…
Through deeply virtual exclusive charmed mesons production wesuggested a unique way of singling out the Intrinsic Charm (IC)content of the nucleon:
Transversity sensitive observables are key: they cannotevolve from gluons
Asymmetries for Pseudoscalar Charmed mesons productionwill establish a lower limit on the size of IC component