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

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σ(W - )B W [nb] 4.4 4.3 4.2 4.1 4 3.9 LHC 7 TeV 1.414 GeV 1.5 GeV 1.6 GeV 1.7 GeV σ(Z 0 )B Z [nb] 1 0.99 0.98 0.97 0.96 0.95 0.94 0.93 0.92 0.91 0.9 LHC 7 TeV 1.414 GeV 1.5 GeV 1.6 GeV 1.7 GeV Figure 5: The total NLO W − and Z 0 cross sections computed with the NNPDF2.1 set with varying charm quark mass mc. it is clear that also at NNLO the details of the treatment of NMC data are irrelevant for the predictions of Higgs production cross sections at hadron colliders. 2 4 2 Ratio to NNPDF2.1 NNLO, Q = 10 GeV 1.25 ) ) 2 R( xg (x, Q 1.2 1.15 1.1 1.05 1 0.95 0.9 0.85 -4 10 NNPDF2.1 NNLO with NMC xsec NNPDF2.1 NNLO with NMC SFs -3 10 -2 10 x -1 10 NNLO gg->H production, Ratio to NNPDF2.1 (TMP) ( H -> gg ) ) σ R ( 1.15 1.1 1.05 1 0.95 NNPDF2.1 NNLO(TMP) NMC-XSEC NNPDF2.1 NNLO(TMP) NMC SF 0.9 100 120 140 160 180 200 220 240 260 280 300 320 MH [ GeV ] Figure 6: Left plot: Comparison of the ratio of the NNPDF2.1 NNLO gluon for the fits with the different treatment of NMC data. Right plot: The total NNLO Higgs cross section in gluon fusion from the preliminary NNLO NNPDF2.1 sets, comparing the fits in which NMC data is treated at the level of structure functions and at the level of reduced cross sections. Therefore we have shown that the treatment of NMC data does not induce appreciable modifications for Higgs production at hadron colliders. Note however that in Ref. 6 the strong coupling was also fitted, and its best fit value was found to strongly depend on the treatment of NMC data. Our results show that if αs is kept fixed, the impact of the treatment of NMC data is negligible. References 1. NNPDF Collaboration, R. D. Ball, et al., Nucl. Phys. B 849, 296-363 (2011), arXiv:1101.1300 2. NNPDF Collaboration, R. D. Ball, et al., Nucl. Phys. B 838, 136 (2010), arXiv:1002.4407. 3. S. Forte et al., Nucl. Phys. B 834, 116 (2010), arXiv:1001.2312. 4. H. L. Lai et al., Phys. Rev. D 82, 074024 (2010), arXiv:1007.2241. 5. A. D. Martin, W. J. Stirling, R. S. Thorne and G. Watt, Eur. Phys. J. C 63 (2009) 189, arXiv:0901.0002. 6. S. Alekhin, J. Blumlein and S. Moch, arXiv:1101.5261. 7. NNPDF Collaboration, R. D. Ball, et al., arXiv:1102.3182.
HOLOGRAPHIC DESCRIPTION OF HADRONS FROM STRING THEORY a Shigeki SUGIMOTO Institute for the Physics and Mathematics of the Universe (IPMU), the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa City, Chiba 277-8583, Japan 1 Claim We give a very brief summary of the basic idea and some of the interesting results in holographic QCD. Using the gauge/string duality, we obtain a low energy effective theory of hadrons based on string theory. Mesons and baryons are obtained as open strings and Dbranes, respectively, and a lot of properties of hadrons can be extracted using this new description. The main claim in this talk is that string theory can be a theory of hadrons. Here, I am not claiming that QCD is wrong. Our claim is that QCD can have a dual description based on string theory, in which the string scale is around 1 GeV. This duality is one of the examples of gauge/string duality which has been discussed extensively since the discovery of the AdS/CFT correspondence. The gauge/string duality is a duality between gauge theory and string theory. Although this is still a conjecture, there are good reasons to believe that this kind of duality really exists. The basic idea is as follows. It is well-known that the low energy effective theory of open strings attached on D-branes is a gauge theory. On the other hand, in some parameter region, the D-branes are better described as the corresponding curved background, which is analogous to the fact that a heavy point-like object in general relativity is described by Schwarzschild background. Therefore, there are two descriptions of the D-branes. One of them is a gauge theory and the other one is string theory in a curved background. Since they are describing the same object, they should be equivalent. The typical example of the gauge/string duality is the duality between 4 dimensional N = 4 super Yang-Mills theory and type IIB string theory in AdS5 × S 5 background. Though the direct proof of the equivalence between these two descriptions is still an open problem, there are a lot of evidence supporting this duality and it is widely believed that they are physically equivalent. Our aim is to apply this idea to more realistic gauge theory (QCD) and see what we can learn from string theory. 2 Holographic QCD To realize QCD in string theory, we consider Nc D4-branes and Nf D8-D8 pairs. The D4-branes are extended along x 0∼4 directions and D8-D8 pairs are extended along x 0∼3 and x 5∼9 directions. To realize a non-supersymmetric 4 dimensional gauge theory on the D4-branes, the x 4 direction a Main part of this talk is based on the works done in collaboration with T. Sakai, H. Hata, S. Yamato, K. Hashimoto and T. Imoto. 1,2,3,4,5
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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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the resulting exponent suggests to
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The counterpart of the ground-state
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(a) Tree level signal decay b ¯Bs
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the B0 d system LHCb profits from i
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This result is based on averaging o
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y non-perturbative effects. Using t
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e M(Dπ) distributions obtained D +
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CHARM PHYSICS RESULTS AND PROSPECTS
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LHCb is working towards its first m
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Two body hadronic D decays Yu Fushe
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where the effective coefficients aA
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6. J. J. Sakurai, Phys. Rev. 156, 1
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states: 6π, 2K4π, 4K2π, KSK3π 1
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egion of X(3872), which corresponds
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Figure 1: The π 0 recoil mass spec
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η → π + π − π 0 η ′ →
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conservation. This second principle
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many of them come from gluon nonper
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Latest Jets Results from the Tevatr
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in for the inclusive trijet event s
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RECENT RESULTS ON JETS FROM CMS F.
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dy (pb/GeV) /dp 2 d 10 10 10 9 10
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RECENT RESULTS ON JETS WITH ATLAS G
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| y| < 0.3 ATLAS Preliminary 2.1 <
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EPOS 2 and LHC Results TanguyPierog
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positions are randomly distributed
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ABOUT THE HELIX STRUCTURE OF THE LU
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Figure 2: Left: Correlations betwee
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Improving NLO-parton shower matched
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due to the inclusion of higher orde
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New Results in Soft Gluon Physics C
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Figure 2: Spacetime depiction of Dr
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Central Exclusive Meson Pair Produc
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in the CEP cross section. However i
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AN AVERAGE b-QUARK FRAGMENTATION FU
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Page 215 and 216: W + W + jj at NLO in QCD: an exotic
Page 217 and 218: Σ fb Σ fb 3.5 3.0 2.5 2.0 0.65 0.
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
Page 241 and 242: SOFT QCD RESULTS FROM ATLAS AND CMS
Page 243 and 244: as a function of multiplicity for t
Page 245 and 246: Determination of αS using hadronic
Page 247 and 248: α S (m Z 0) 0.15 0.14 0.13 0.12 0.
Page 249 and 250: Reaching beyond NLO in processes wi
Page 251 and 252: dσ/dp t,max [fb/GeV] 10 5 10 4 10
Page 253 and 254: Nonlocal Condensate Model for QCD S
Page 255 and 256: The lower bound for the integration
Page 257 and 258: AN ALTERNATIVE SUBTRACTION SCHEME F
Page 259 and 260: where MBorn,g is the underlying Bor
Page 261 and 262: THE NNPDF2.1 PARTON SET F. CERUTTI
Page 263: ottom masses mb of 4.25, 4.5, 5.0 a
Page 267 and 268: ∫ SYM = κ d 4 ( 1 xdzTr 2 h(z)F
Page 269 and 270: Nuclear matter and chiral phase tra
Page 271 and 272: fact that for Nc ≫ 3 a gas of fre
Page 273 and 274: Recent Results on Light Hadron Spec
Page 275 and 276: Figure 3: Mass spectrum fitting wit
Page 277 and 278: MEASUREMENT OF THE J/ψ INCLUSIVE P
Page 279 and 280: 2 Counts per 40 MeV/c 120 100 80 60
Page 281 and 282: STUDY OF Ke4 DECAYS IN THE NA48/2 E
Page 283 and 284: photons were accepted while particl
Page 285: 6. Structure Functions Diffraction
Page 288 and 289: 2 Hadronic Final States and Diffrac
Page 290 and 291: 3 Summary A brief overview of recen
Page 293 and 294: Using HERA Data to Determine the In
Page 295 and 296: k f n 0.4 0.2 0 -0.2 0.4 0.2 0 -0.2
Page 297: The singular term, on the other han
Page 301 and 302: Pomeron Kernel: The leading order B
Page 303 and 304: DIFFRACTION, SATURATION AND pp CROS
Page 305 and 306: In Ref. 6 , the saturated Froissart
Page 307 and 308: Transverse Energy Flow with Forward
Page 309 and 310: 1/N d dE t /dη 0.1 0.09 0.08 0.07
Page 311: 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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