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

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(1/N ) dN/dA evt J φ Δ ) dN/d (1/N evt 4 3 2 1 40-100% 0 0 0.2 0.4 0.6 0.8 1 A J 10 1 -1 10 -2 10 2 2.5 3 Δφ (1/N ) dN/dA evt J φ Δ ) dN/d (1/N evt 4 3 2 1 20-40% 0 0 0.2 0.4 0.6 0.8 1 A J 10 1 -1 10 -2 10 2 2.5 3 Δφ (1/N ) dN/dA evt J φ Δ ) dN/d (1/N evt 4 3 2 1 10-20% 0 0 0.2 0.4 0.6 0.8 1 A J 10 1 -1 10 -2 10 2 2.5 3 Δφ (1/N ) dN/dA evt J φ Δ ) dN/d (1/N evt 4 3 2 1 s =2.76 TeV 0-10% NN ATLAS Pb+Pb -1 Lint=1.7 μb 0 0 0.2 0.4 0.6 0.8 1 A J 10 1 -1 10 -2 10 Pb+Pb Data p+p Data HIJING+PYTHIA 2 2.5 3 Δφ Figure 1: (top) Dijet asymmetry distributions for data (points) and unquenched HIJING with superimposed PYTHIA dijets (solid yellow histograms), as a function of collision centrality (left to right from peripheral to central events). Proton-proton data from √ s = 7 TeV, analyzed with the same jet selection, is shown as open circles. (bottom) Distribution of ∆φ, the azimuthal angle between the two jets, for data and HIJING+PYTHIA, also as a function of centrality. events superimposed on HIJING events 6 . 2 Di-jet asymmetry and azimuthal correlation The cross-section of dijet production is a dominant contribution to the total jet production cross-section. Jets are therefore most often produced in pairs well balanced in azimuth and transverse energy. Jet quenching may lead to an imbalance in the transverse energy since each jet, or initial parton, traverses a different path length in the QCD medium. Such an imbalance can be quantified using the asymmetry defined as AJ = (ET,1 − ET,2)/(ET,1 + ET,2), where ET,1 > ET,2 are transverse energies of jets in a dijet system. We focus on the balance between the highest transverse energy pair of jets in events. These jets are required to have an azimuthal angle separation, ∆φ = |φ1 − φ2| > π/2 to reduce contributions from multi-jet final states. Furthermore the first jet is required to have ET,1 > 100 GeV, and the second jet ET,2 > 25 GeV. The jet selection is chosen such that the first (leading) jet has high reconstruction efficiency and the second (sub-leading) jet is above the distribution of background fluctuations and soft jets associated with the collision. The jet selection criteria yield a sample of 1693 events from the 2010 Pb+Pb data corresponding to an integrated luminosity of approximately 1.7 µb −1 . The dijets are expected to have the asymmetry with a maximum near zero and rapidly decreasing towards the kinematic limit determined by the selected cuts which lies near the asymmetry of 0.7. Figure 1 shows the result of the measurement, upper plots show the dijet asymmetry, lower plots show the dijet azimuthal correlations. The measurement is evaluated in four bins of collision centrality going from the most central (0-10%) to the most peripheral (40-100%). The centrality is defined using the total sum of transverse energy (ΣET) deposited in the forward calorimeters (FCal). The asymmetry distribution for dijets measured in p+p collisions at √ s = 7 TeV is shown in open symbols in the upper plots of Fig. 1. The yellow distributions show the Monte Carlo (MC) reference which consists of fully reconstructed PYTHIA dijets embedded into the underlying event simulated by the HIJING MC generator. The presence of dijets with large asymmetries both in the reference samples and p+p data reflects the contribution from events with a topology of three or more jets, and the detector effects. Compared to the reference, the asymmetry measured in central heavy ion collisions exhibits the absence of the global maximum
[GeV] T, leading Subtracted E 140 120 100 80 60 40 20 0-10% 10-20% 20-30% 30-40% 40-100% Pb+Pb -1 Lint=1.7μb s = 2.76 TeV NN ATLAS Preliminary 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 AJ [MeV] Standard deviation of 7x7 towers ET 12000 10000 8000 6000 4000 | 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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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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1/N dN/dx 3.5 3 2.5 2 1.5 1 0.5 ALE
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W + W + jj at NLO in QCD: an exotic
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Σ fb Σ fb 3.5 3.0 2.5 2.0 0.65 0.
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W/Z+Jets and W/Z+HF Production at t
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Figure 2: Measured inclusive jet di
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W and Z physics with the ATLAS dete
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SHERPA 9 MC generators but not by P
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W/Z + Jets results from CMS V. CIUL
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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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Page 311: 7. Heavy Ions
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Page 334 and 335: 3 Results 3.1 Dijet Properties in p
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Page 342 and 343: Here D is the diffusion coefficient
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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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