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

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and for different clustering algorithms. The experimental uncertainties are lower than the uncertainties associated with the theoretical predictions. Since inclusive jet measurements allow to constrain PDFs of the proton, especially gluon densities at high x, (x ≥0.25), two groups performing global QCD analyses to determine PDFs included these Tevatron measurements in their compilation, with resulting PDFs referred as MSTW2008 and CT09. Inclusion of the Tevatron measurements lead to somewhat softer high-x gluons than the ones previously available. The inclusive jet cross section is directly related to the measurement of the strong coupling constant. The CDF collaboration performed this analysis using the 1994-95 data, and D0 recently published a new αS determination 6 based on the inclusive jet cross section measurement discussed above. The value of the strong coupling constant is determined from sets of inclusive jet cross section data points by minimizing the χ 2 function between data and the theoretical results. In order to avoid the complications arising from the αS dependence on PDF determinations, only 22 data points out of 110 were kept for αS determination. This measurement provides the most precise result for the strong coupling constant from the hadron colliders αS(MZ) = 0.1161± 0.0048 0.0041 . The CDF 7 and D0 8 experiments used the dijet invariant mass distribution to search for resonances decaying into jets. In the case of D0, measurements of the dijet angular distributions are performed in different regions of the dijet invariant mass. A good agreement between data and theory, which translates into improved limits in different models, is observed for both experiments. 2 Multi-Jet Production We present a measurement by the D0 collaboration of the differential inclusive three-jet cross section as a function of the invariant three-jet mass (M3jet). The data set corresponds to an integrated luminosity of 0.7 fb −1 . The measurement is performed in three rapidity regions (| y | pT min and | y |
in for the inclusive trijet event sample also belong to the same pTmax bin for the inclusive dijet event sample. Given the definitions above for inclusive n-jet event samples, R 3/2(pT max) equals the conditional probability for an inclusive dijet event (at pT max) to contain a third jet with pT > pT min. The data is well described by the SHERPA event generator (using default settings) with tree-level matrix elements for 2-, 3-, and 4-jet production. For the PYTHIA event generator, the results depend strongly on the chosen parameter tune. Commonly used tunes (for both the angular-ordered and the pT -ordered parton shower), see Fig. 3, overshoot the measured ratios significantly over the whole pT max range for all pT min requirements. R 3/2 = σ 3-jet / σ 2-jet 0.2 0.15 0.1 0.05 0 L int = 0.7 fb -1 p Tmin = 50 GeV 100 200 300 500 DØ preliminary p Tmin = 70 GeV 100 200 300 500 p Tmax (GeV) SHERPA PYTHIA: tune A tune DW tune BW p Tmin = 90 GeV 100 200 300 500 Figure 3: R3/2 ratio measured as a function of the leading jet pT max for different pT min requirements for the other jets. Predictions from SHERPA and PYTHIA (three tunes using the virtuality-ordered parton shower) are compared to the data. 3 Study of Substructure of High pT Jets The study of high transverse momentum (pT ) massive jets provides an important test of pQCD and gives insight into the parton showering mechanism. In addition, massive boosted jets compose an important background in searches for various new physics models, the Higgs boson, and highly boosted top quark pair production. Particularly relevant is the case where the decay ] 2 [1/GeV/c dNjet jet dm 1 Njet 0.007 0.006 0.005 0.004 0.003 0.002 0.001 Quark Gluon 0.006 0.004 0.002 0 -1 CDF Run II, L = 6 fb int Midpoint Anti-kT 100 150 200 250 Data, Midpoint, R = 0.7 QCD, Pythia 6.216 0 80 100 120 140 160 180 200 220 240 260 280 jet1 2 m [GeV/c ] Figure 4: The normalized jet mass distribution for midpoint jets with pT > 400 GeV/c. The theory predictions for the jet functions for quarks and gluons are shown as solid curves and have an estimated uncertainty of 30%. The inset compares midpoint and anti − kt jets. of a heavy resonance produces high-pT top quarks that decay hadronically. In all these cases, the hadronic decay products can be detected as a single jet with substructure that differs from
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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
Page 129 and 130: IN PURSUIT OF NEW PHYSICS WITH B DE
Page 131 and 132: τK + K −/τBs 1.01 1.00 0.99 0.9
Page 133 and 134: CHARMLESS HADRONIC B-DECAYS AT BABA
Page 135 and 136: surements (fL ∼ 0.5). Several att
Page 137 and 138: Estimating the Higher Order Hadroni
Page 139 and 140: the resulting exponent suggests to
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
Page 168 and 169: egion of X(3872), which corresponds
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: Latest Jets Results from the Tevatr
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 and 190: | y| < 0.3 ATLAS Preliminary 2.1 <
Page 191 and 192: EPOS 2 and LHC Results TanguyPierog
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
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
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TEVATRON RESULTS ON MULTI-PARTON IN
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iterative midpoint cone algorithm w
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INVESTIGATIONS OF DOUBLE PARTON SCA
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¦ § ¦ ¨ ¥ ¦ ¨ § ¦ © ¦ §
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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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