2011 QCD and High Energy Interactions - Rencontres de Moriond ...

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2 ≥ ] lead T σ/d p /[d 3 ≥ ] lead T σ/d p [d MC/Data 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 ATLAS Preliminary -1 R=0.4, ∫ L dt=2.43 pb Data ( s=7 TeV)+syst. ALPGEN+HERWIG AUET1 PYTHIA AMBT1 ALPGEN+PYTHIA MC09’ 100 200 300 400 500 600 700 800 100 1.2 1 0.8 100 200 300 400 500 600 700 800 p (leading jet) [GeV] T 2 ≥ ] lead T σ/d p /[d 3 ≥ ] lead T σ/d p [d Theory/Data 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 ATLAS Preliminary -1 R=0.4, ∫ L dt=2.43 pb Data ( s=7 TeV)+syst. NLO+non.pert.+syst 0.8 0.6 200 300 400 500 600 700 800 100 200 300 400 500 600 700 800 lead p [GeV] 1 1.2 Figure 3: Ratio of three-to-two jet differential cross section as a function of the leading jet pT. The results are compared to leading order parton shower Monte Carlo simulations (left) and to next-to-leading order pQCD calculations with the MSTW 2008 NLO PDF (right). pT > 60GeV, of which at least one has pT > 80GeV, is performed by ATLAS with an integrated luminosity of 2.43pb −1 . Figure 3 (left) presents results for the measurement of the three-to-two jet inclusive cross section as a function of the pT of the leading jet after unfolding of detector effects. The systematic uncertainty of this ratio is small (∼ 5%) due to the reduced impact of the JES uncertainty and the cancellation of the uncertainty of the luminosity measurements. Experimental data are compared with predictions from leading order Monte Carlo simulations with parton showers from PYTHIA, ALPGEN+PYTHIA and ALPGEN+HERWIG. ALPGEN generally describes the data well, whether HERWIG or PYTHIA parton showers are used, while PYTHIA predicts a larger three jet cross section than what is measured. Figure 3 (right) shows a comparison of the same experimental results with next-to-leading order calculations (MSTW 2008 NLO PDF) corrected for non-perturbative effects. The systematic uncertainties on the theoretical prediction are shown as dotted red lines above and below the theoretical prediction. Good agreement is found between the data and the theory prediction within systematic uncertainties for both studies except in the lowest transverse momentum bin. 1. ATLAS Collaboration, JINST 3 (2008) S08003. 2. ATLAS collaboration, ATLAS-CONF-2010-050 (http://cdsweb.cern.ch/record/1273169), CERN, Geneva, July, 2010. 3. ATLAS Collaboration, ATLAS-CONF-2011-047 (http://cdsweb.cern.ch/record/1333967), CERN, Geneva, March, 2011. 4. ATLAS Collaboration, Phys. Rev. Lett. 106 172002 (2011). 5. ATLAS Collaboration, ATLAS-CONF-2011-038 (http://cdsweb.cern.ch/record/1332225), CERN, Geneva, March, 2011. 6. ATLAS Collaboration, ATLAS-CONF-2011-043 (http://cdsweb.cern.ch/record/1331131), CERN, Geneva, March, 2011. 7. W. Lampl et al., ATL-LARG-PUB-2008-002 (http://cdsweb.cern.ch/record/1099735), CERN, Geneva, April, 2008. 8. M. Cacciari, G. Salam, and G. Soyez, JHEP 0804 (2008) 063. 9. ATLAS Collaboration, ATLAS-CONF-2011-032 (http://cdsweb.cern.ch/record/1333972), CERN, Geneva, March, 2011. 10. ATLAS Collaboration, ATLAS-CONF-2011-014 (http://cdsweb.cern.ch/record/1329854), CERN,Geneva, March, 2011. T
EPOS 2 and LHC Results TanguyPierog (1) , Iu.Karpenko (2,3) , and K.Werner (3) (1) Karlsruhe Institut of Technology, Institut für Kernphysik, Postfach 3640, 76021 Karlsruhe Germany (2) Bogolyubov Institute for Theoretical Physics, Kiev 143, 03680, Ukraine (3) SUBATECH, University of Nantes – IN2P3/CNRS– EMN, Nantes, France To study the effects related to the formation of a Quark-Gluon-Plasma in heavy ion collisions, the proton-proton collisions are usually used as a reference. If this approach seems to be valid at RHIC or for very high transverse momentum at LHC, it might be different at intermediate pt for LHC energies, where some collective effects might be visible already in pp data (ridge,...). Within a global model such as EPOS 2, where light and heavy systems are treated using the same physics, we can test the collective effects both in pp and lead-lead collisions at LHC. In this paper, it will be shown that the collective effect are not negligible already for pp at LHC. 1 Introduction The CMS collaboration published recently results 1 on two particle correlations in ∆η and ∆φ, in pp scattering at 7 TeV. Most remarkable is the discovery of a ridge-like structure around ∆η = 0, extended over many units in ∆η, referred to as “the ridge”, in high multiplicity pp events. A similar structure has been observed in heavy ion collisions at RHIC, and there is little doubt that the phenomenon is related to the hydrodynamical evolution of matter. This “fluid dynamical behavior” is actually considered to be the major discovery at RHIC 2 . 1.5 0.5 -0.5 ∆φ R( ∆η, ∆φ) 1 0 4 3 2 1 0 -1 -3 -2 -1 0 1 2 3 ∆η R( ∆η, ∆φ) Figure 1: (Color online) Two particle correlation function R versus ∆η and ∆φ for high multiplicity events in pp collisions at 7 TeV, as obtained from a hydrodynamical evolution based on flux tube initial conditions (lefthandside). On the righthand-side the calculation is done without hydro evolution .i.e. particle production directly from string (flux tube) decay.We consider particles with pt between 1 and 3 GeV/c. So does pp scattering provide as well a liquid, just ten times smaller than a heavy ion 1.5 ∆φ 1 0.5 0 -0.5 4 3 2 1 0 -1 -3 -2 -1 0 1 2 3 ∆η
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2011 QCD and High Energy Interactio
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Proceedings of the XLVIth RENCONTRE
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2011 RENCONTRES DE MORIOND The XLVI
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Foreword Contents 1. Higgs Searches
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1. Higgs
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95% CL Limit/SM 10 1 Tevatron Run I
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Events/5 GeV 6 10 5 10 4 10 3 10 2
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Events / 0.5 CDF Run II Preliminary
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For the most sensitive sub-channel
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Table 1: Table listing the various
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various SM Higgs mass hypotheses. T
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constraints on parameters are given
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Figure 2: Invariant mass of the ele
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Figure 4: CDF Exclusion limits for
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Table 1: Main phases of 2010 commis
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Table 4: Parameter list for early (
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luminosity of 1.2×10 33 cm −2 s
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2 QCD Analysis settings HERA PDFs a
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min 2 - 2 20 15 10 5 0 H1 and ZEUS
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SM σ / σ 95% CL Limit on 3 10 2 1
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NNLO σ/ σSM 95% CL Upper Bound on
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the report of this working group. I
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2.3 The impact of different PDF par
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SUSY Searches at the Tevatron Ph. G
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on the quality (loose or tight) and
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SUSY searches at ATLAS N. Barlow, o
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channel. These results are combined
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Figure 2: The top left plot shows t
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2010 data. Analysis techniques for
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as main discriminator between event
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sign leptons is particularly intere
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N of events 5 10 DATA 10 4 3 10 10
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) [pb] ν e → B(W’ × σ 10 1 -
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2 Searches in the dijet final state
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ing that the neutrinos were the onl
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The Quasi-Classical Model in SU(N)
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g (γ µ kµ) γ µ Aa µ g (pk)
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3. Top
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of their vertex with respect to the
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of about 9%. 3.1 Differential Cross
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Figure 5: Summary of most recent CD
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the minimum number of jets identifi
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where f’s are probability functio
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hood technique, with a simultaneous
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momentum direction of the b quark f
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Events 200 150 100 50 -1 DØ L=5.4
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after all corrections in the M t¯t
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for prompt J/ψ under the fully tra
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2 Events / 20 MeV/c 50 40 30 20 10
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ATLAS - consists of four parts (mon
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5 D mesons High cross-sections of D
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μ +X') [nb/GeV] → b+X → (pp T
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GeV) μ |
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HEAVY FLAVOUR IN A NUTSHELL Robert
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Figure 1: Overlapping constraints o
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Figure 3: Constraints on new physic
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RECENT B PHYSICS RESULTS FROM THE T
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(IP) distributions are fitted separ
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decays CDF extracts Using a 5.94 fb
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Search for B 0 s → µ+ µ − and
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Ref. 10,11 . The expected GL distri
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IN PURSUIT OF NEW PHYSICS WITH B DE
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τK + K −/τBs 1.01 1.00 0.99 0.9
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CHARMLESS HADRONIC B-DECAYS AT BABA
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surements (fL ∼ 0.5). Several att
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Estimating the Higher Order Hadroni
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Page 141: The counterpart of the ground-state
Page 144 and 145: (a) Tree level signal decay b ¯Bs
Page 146 and 147: the B0 d system LHCb profits from i
Page 148 and 149: This result is based on averaging o
Page 150 and 151: y non-perturbative effects. Using t
Page 152 and 153: e M(Dπ) distributions obtained D +
Page 155 and 156: CHARM PHYSICS RESULTS AND PROSPECTS
Page 157 and 158: LHCb is working towards its first m
Page 159 and 160: Two body hadronic D decays Yu Fushe
Page 161 and 162: where the effective coefficients aA
Page 163: 6. J. J. Sakurai, Phys. Rev. 156, 1
Page 166 and 167: states: 6π, 2K4π, 4K2π, KSK3π 1
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Page 170 and 171: Figure 1: The π 0 recoil mass spec
Page 172 and 173: η → π + π − π 0 η ′ →
Page 174 and 175: conservation. This second principle
Page 176 and 177: many of them come from gluon nonper
Page 179 and 180: Latest Jets Results from the Tevatr
Page 181 and 182: in for the inclusive trijet event s
Page 183 and 184: RECENT RESULTS ON JETS FROM CMS F.
Page 185 and 186: dy (pb/GeV) /dp 2 d 10 10 10 9 10
Page 187 and 188: RECENT RESULTS ON JETS WITH ATLAS G
Page 189: | y| < 0.3 ATLAS Preliminary 2.1 <
Page 193 and 194: positions are randomly distributed
Page 195 and 196: ABOUT THE HELIX STRUCTURE OF THE LU
Page 197 and 198: Figure 2: Left: Correlations betwee
Page 199 and 200: Improving NLO-parton shower matched
Page 201 and 202: due to the inclusion of higher orde
Page 203 and 204: New Results in Soft Gluon Physics C
Page 205 and 206: Figure 2: Spacetime depiction of Dr
Page 207 and 208: Central Exclusive Meson Pair Produc
Page 209 and 210: in the CEP cross section. However i
Page 211 and 212: AN AVERAGE b-QUARK FRAGMENTATION FU
Page 213 and 214: 1/N dN/dx 3.5 3 2.5 2 1.5 1 0.5 ALE
Page 215 and 216: W + W + jj at NLO in QCD: an exotic
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Page 219 and 220: W/Z+Jets and W/Z+HF Production at t
Page 221 and 222: Figure 2: Measured inclusive jet di
Page 223 and 224: W and Z physics with the ATLAS dete
Page 225 and 226: SHERPA 9 MC generators but not by P
Page 227 and 228: W/Z + Jets results from CMS V. CIUL
Page 229 and 230: Events / 0.1 600 500 400 300 200 10
Page 231 and 232: TEVATRON RESULTS ON MULTI-PARTON IN
Page 233 and 234: iterative midpoint cone algorithm w
Page 235 and 236: INVESTIGATIONS OF DOUBLE PARTON SCA
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Page 239 and 240: Figure 4: Two-dimensional distribut
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SOFT QCD RESULTS FROM ATLAS AND CMS
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as a function of multiplicity for t
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Determination of αS using hadronic
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α S (m Z 0) 0.15 0.14 0.13 0.12 0.
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Reaching beyond NLO in processes wi
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dσ/dp t,max [fb/GeV] 10 5 10 4 10
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Nonlocal Condensate Model for QCD S
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The lower bound for the integration
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AN ALTERNATIVE SUBTRACTION SCHEME F
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where MBorn,g is the underlying Bor
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THE NNPDF2.1 PARTON SET F. CERUTTI
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ottom masses mb of 4.25, 4.5, 5.0 a
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HOLOGRAPHIC DESCRIPTION OF HADRONS
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∫ SYM = κ d 4 ( 1 xdzTr 2 h(z)F
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Nuclear matter and chiral phase tra
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fact that for Nc ≫ 3 a gas of fre
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Recent Results on Light Hadron Spec
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Figure 3: Mass spectrum fitting wit
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MEASUREMENT OF THE J/ψ INCLUSIVE P
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2 Counts per 40 MeV/c 120 100 80 60
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STUDY OF Ke4 DECAYS IN THE NA48/2 E
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photons were accepted while particl
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6. Structure Functions Diffraction
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2 Hadronic Final States and Diffrac
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3 Summary A brief overview of recen
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Using HERA Data to Determine the In
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k f n 0.4 0.2 0 -0.2 0.4 0.2 0 -0.2
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The singular term, on the other han
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Pomeron Kernel: The leading order B
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DIFFRACTION, SATURATION AND pp CROS
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In Ref. 6 , the saturated Froissart
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Transverse Energy Flow with Forward
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1/N d dE t /dη 0.1 0.09 0.08 0.07
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7. Heavy Ions
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dη)/(0.5〈 N 〉 ) part ch (dN 10
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) 3 (fm long R side R out R 400 350
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correlation density is computed as
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Away-side gaussian width 1.4 1.2 1
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Figure 1: (a) J/ψ rapidity distrib
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lower x, or forward rapidity one ex
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φ ∆ /d assoc dN trig 1/N 0.5 0.4
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AA,Pythia I 2.5 2.0 1.5 1.0 0.5 0.0
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(1/N ) dN/dA evt J φ Δ ) dN/d (1/
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[GeV] Tower ET Σ 50 45 40 35 30 25
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3 Results 3.1 Dijet Properties in p
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(GeV/c) (GeV/c) T T p < 40 20
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wheredσm(N +N → h+X)/dp Tdy isth
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R AA 0.6 0.5 0.4 0.3 0.2 0.1 0 0.5
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Here D is the diffusion coefficient
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The effect of triangular flow in je
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When both trigger and associated pa
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The first Z boson measurement in th
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Figure 1: Dimuon invariant mass spe
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2. V. Kartvelishvili, R. Kvatadze a
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esolution [ µ m] ! r 0 d 300 250 2
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Figure 5: Differential transverse m
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Figure 1: Average nuclear modificat
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Another way of using direct photons
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Pb R g 2 Nuclear Modifications for
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q T 1/R AA 1.6 1.4 1.2 1 0.8 LO Fra
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] 2 > [g/cm max
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Methods (a) and (c) constrain the e
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EXPERIMENTAL SUMMARY: ENTERING THE
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ut also for valence quarks involved
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The sensitivity to Standard Model H
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Figure 10: Top pair mass spectrum m
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Figure 13: Particle densities (left
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4 Low energy precision Spectroscopy
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asymmetries associated to Bd and Bs
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XLVIth Rencontres de Moriond QCD an
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