hsqcd 2004 dglap glr dpp bfkl alan martin (durham) repino, st. petersburg 18-22 may, 2004
TRANSCRIPT
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HSQCD 2004
DGLAP
GLR
DPP
BFKL
Alan Martin (Durham)Repino, St. Petersburg18-22 May, 2004
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Klempt
not a glueball
Glueballs, hybrids, pentaquarks
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Klempt
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Pentaquarks
Several expts see an exotic B=1, S=1baryon resonance in K+n or K0p channels(1530) with narrow width <10 MeV
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The chiral soliton model (SM) predicted s(1530)with <15 MeV, JP=(1/2)+ in a 10 of SU(3)f
Praszalowicz(1987), Diakonov,Petrov,Polyakov(1997)
s(1530)
N
NA49 see(1860) which is not seen by ZEUS & WA89
seen by manyexpts in K+n, K0p
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Popov
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HERMES
but is s(1530)seen by H1 ??
Hyarapetian
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1.5 MeV now expected from SM --- Petrov
Kubantsev
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Petrov
Bag model fails for +(uudds)
Need new degree of freedom:
diquark ? -------CQMJaffe-Wilczek (ud)2 sKarliner-Lipkin (ud)(uds)…..but needs diquark in P-wave, many problems,always predicts too heavy + e.g. Narodetskii
is lightest degree of freedom ----- SM
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s(1530)
N
Polyakovis the N*(1710) in the 10 ?
considers mixing with octet pp* / nn* ~ 0 by U-spin ~ 10-20 MeV
N PWA: N* could be P11(1680 or 1730)
N 2 MeV 5 MeVN 3 MeV
Petrov considersmixing with theRoper octet
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Klempt
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1577 ?
SM predicts 27 with I=1 KN multiplet -- but K+p partner not seen
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H1 see c
which is not seen by ZEUS ?
Buschhorn
bb prod: latest data and theory in satisfactory agreement
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Hadron spectroscopy is on the boil.
Changes almost daily.
Very exciting and experimentally confusing.
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low x
Rostovsev
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Fixed target DIS ep, ed, N; D-Yan, W asym, Tevatron jetsHERA epglobal DGLAP parton analyses CTEQ, MRSTanalyses to selected data sets Botje, Alekhin, ZEUS, H1…
Expect small x processesto be driven by the gluon.
Surprise at v.low scales appear to be dominated byby singlet sea quarks valence-like or -ve gluon !
Sea quarks & gluons not(perturbatively) connected.
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x
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1993
(Lum=20 nb-1)
Now
F2 versus x
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Reg
ge
conf
inem
ent
BF
KL
DGLAP
ln Q2
ln 1/x
saturatio
n
absorptive corr.
HERA
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HERA has opened up the small x domain
• how large is the DGLAP domain ?
• are BFKL (log 1/x) effects evident ?
• is there any evidence of absorptive corrections, or even parton saturation ?
• HERA observes diffractive DIS (at ~10% of DIS). What role does it play ?
• what would we like HERA to measure now ?
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CTEQ gluon
compared to
MRST error band
Q2=5
Q2=100
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Parton uncertainties due to stat/sym errors of data fitted
Other uncertainties includeselection of data fitted; choice of x,Q2,W2 cutsTheoretical uncertaintieshigher-order DGLAP NLO, NNLO…Moch,Vermaseren,Vogtsln(1/x) and sln(1-x) effects absorptive corrections from parton recombinationresidual higher-twist effectsQED effectsUncertainties due to input assumptionsisospin-violating effects MRSTs not equal to s CTEQheavy-target correctionschoice of input parametrization
no NuTeV sin2 anomaly
Alwall
Kotikov
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MRST NNLO suggests W or Z prod. can bebe used as a luminosity monitorat the Tevatron (& LHC)
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Kataev Gottfried sum rule in the large Nc limit
IG = (dx/x) (F2p – F2
n) = 0.235 +/- 0.026 expt.
= 1/3 - 2/3 dx (d – u)
valence:pert. corr. small,higher twist small s/Nc
2
(i)checks from Adler SR.(ii) 3-loop anom. dim. of MVV (NNLO) confirms colour structure
non-pert asymmetryof sea.what happens as x0? (SM)
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Experimental ways to determine the gluon
• FL most direct x ~ 10-4 - 10-3
• Prompt photon data (WA70,E706) and theory problems
• Tevatron jets x ~ 0.07 – 0.5
• HERA jets x ~ 0.01 - 0.1 (ZEUS)
• Diffractive J/ at HERA g2 x ~ 10-3 need to improve theory
(+ momentum sum rule)
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ZeitnitzInclusive jets
Top quark cross section
Run I
Run II
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3 jets/2 jets
inclusive jethelps pin downgluon at x~0.1
Savin &Rostovtsev
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Extremely valuable if HERA could measure FL with sufficient precision --- to pindown the low x gluon
FL
Thorne
Q2=10
Q2=5
Q2=20 Q2=40Data are Klein’ssimulation basedon runs at Ep =400,465,575,920GeV.
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DGLAP
ln 1/x resum ?abs. corr. ?
Higgs
Stirling
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Lipatov
What happens to the Pomeron traj. at high temp.?
Remarkably -- nothing happens for fixed s.
-- result of conformal inv. of the original theory.
Running s destroys inv. – no exact solution –expect some change
May be possible to establish relation betweenBFKL and string dynamics –dimensions of space-time = no. of t ch. gluons?
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Gluon kt distribution in resummed NLL BFKL
y=6
y=4
y=2
LO BFKL
NLL BFKL
DGLAP, DLLA
Final kt=30 GeV at y=ln(1/x)=8
Gluon kt along evolutionchain --- find thatNLL BFKL and DGLAPv.similar
Important sinceunderlying eventmight have maskedNew Physics signalsat LHC.
Monte Carlos OK
Ryskin
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Diffractive DIS data Mastroberardino
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Schildknecht:Also describes F2, F2
D,vector meson prod.well, using dipole approach with GVMD,incorporating saturation
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mq=0
mq=140 MeV
Original Golec-Biernat, Wusthoff fit
Include charm.
Relate to xg &evolve in Q2
+Bartels,Kowalski
Is it saturation orconfinement ?
There are other dipole fits withoutsaturatione.g. Forshaw,Kerley & Shaw.
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Saturation
No definitive experimental evidence
Much theoretical activity -----BK, JIMWLK,…equations
A glimpse…
Rostovsev
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Equivalent approaches
p rest frame / fast dipole fast p / slow dipole
bare dipole
evolved pwave fn.(cgc)
wave fn.
Balitsky Kovchegov eq.
Jalilan Marian, Iancu, McLerran,Weigert, Leonidov, Kovner eq.
leads to
Lublinsky explained this muchbetter
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Fadin
Bartels
Two progress reports:
is proving that gluon Reggeization is valid at NLO BFKL
Checking the consistency of bootstrap relations, s ch.unitarity and Reggeization for production amplitudes.
is relating the BK equation to Reggeon field theory
Remarkable simplifications from Mobius invariance
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Saturation momentum Qs(x) in NLL BFKL ~ DGLAP
x0 defined byQs(x0)=1 GeV
Ryskin
LO BFKLunreliable,BK,JIMWLKeqs. ?!
Qs2
x0/x
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Nikolaev
Saturation effects in nuclei.
Diffractive DIS is about 50% in nuclei.
Collective nuclear glue (nuclear Pomeron) is agood idea but destroys kT factorization. Also fan diagrams no longer sufficient.
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Diffractive DIS data Mastroberardino
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Mastroberardino
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Mastroberardino
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Mastroberardino
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ln Q2
highertwist
Bartels,Ellis,Kowalski & Wusthoffbase parametrizationon these forms
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Contribution of diffractive F2 to inclusive F2
Apply the AGK cutting rules to contrib.AGK in QCD: Bartels & Ryskin
F2abs ~ - F2
D negative (~Glauber shadowing)
In pQCD, is a cut, not a pole Lipatov
has a continuous no. of compts of different size, r~1/For eachcompt., DGLAP evol. of F2
D(x,Q2,2) starts from Q
provided it is large enough
Im Tel ~ tot
Ryskin
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Ryskin
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Input ~ MRST2001
Ryskin
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Ryskin
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xg, xS const
Ryskin
Need Q2 Q2+1mimics power corr.
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rapidity gap survival factor S2 ~ 0.1
HERA
S2 ~ 1
*
Survival factors calc. from2-ch eikonal model basedon multi-Pom. exchange &s channel unitarity KKMR
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Diffractive photoproduction of dijets: direct compt. S2 ~ 1 resolved compt. (hadron-like) S2 ~ 0.34
NLO analysis byKlasen & Kramer,--good agreementwith prelim. H1 data
Note in LO analysis,data would prefer S2 ~ 1 for resolved
Mastroberardino
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Exclusive diffractive Higgs signal pp p+H+p
Higgs
For a 120 GeV (SM) Higgsat the LHC (L=30 fb-1)11 events / 4 backgroundFor MSSM with tan~50, mA~130 GeV70 events / 3 background
Advantages: 2 indep. MH det.1. missing mass to proton taggers (M~1 GeV)2. bb decay (M~10 GeV)
bb backgd v.suppressed by Jz=0 selection rule
S2 = 0.026
Khoze
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5signal at LHC
30 fb-1
300 fb-1
Khoze
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Kim, Schlein
Higgs via single Pomeron exchange
Predicted much larger signal, but
---need to study of background,---include evolution from Q2=50 GeV2 (UA8) up toQ2=104 GeV2
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Amarian Semi-inclusive ep eX HERMES
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Sidorov
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Sidorov
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Ochs
Ng/Nq = CF/CA = 9/4 -- naïve
MLLA -- better agreement with e+e- data
Full calculation – excellent agreement parameter determined from multiplicity
Pivovarov
Calculated the B parameter at NLO --- three loopnon-factorising massive Feynman graph B = 1 + 0.095 - 0.05 pert. nonpert.
Apologies omitting for so many excellent contributions
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There are so many crucial measurements still tobe done, and unless the correct action is set intomotion soon, time will run out for HERA ---while the physics potential of the machine is stillcoming to its prime.
Buschhorn
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Very special thanks toPetersburg Nuclear Physics InstitutePetersburg branch of the RASPetersburg State UniversityFock Institute of PhysicsStaff of the Baltiets Hotel
AssistantsPavel YakimovJulia GrebenyukNastya GrebenyukSergey AnufrievSergey Afonin
Foreign departmentTatiana BondarenkoNatalia Nikitina
DriversSergey ZvonovskyEduard PatsyukovDima Dzyubchuk
PhotographerTatiana Potapova
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Social ProgrammeLyudmila Kolesnikova
SecretariatGalina StepanovaZoya GaditskayaLidia RusinovaTatiana Gordeeva
Victor GordeevVictor KimLev Lipatov
…and to ALL the participants for making this sucha productive and enjoyable meeting
…and so on to HSQCD 2005