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

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for prompt J/ψ under the fully transverse, fully longitudinal and no polarization hypotheses. The measured prompt production cross-section as a function of pT (dσ/dpT) has been compared to different theoretical predictions based on CS, non-relativistic QCD (NRQCD), and colour evaporation (CEM) models both at leading order (LO) and at next to leading order (NLO) (also NNLO for CS). There is good agreement between the theory predictions and the data. The agreement between the measured non-prompt production cross-section in bins of J/ψ pT and fixed-order next-to-leading log computations is also excellent. The measured prompt J/ψ production cross-section integrated over the fiducial region, assuming unpolarized J/ψ, is σJ/ψ = 10.52 ± 0.04 ± 1.40 +1.64 −2.20 µb where the first uncertainty is statistical, the second is systematic and the third is the uncertainty related to the assumption of unpolarized J/ψ. The integrated non-prompt production cross-section is σJ/ψ = 1.14 ± 0.01 ± 0.16 µb. Extrapolating this to the full polar angle range, the b¯b production cross-section is σ(pp → b¯bX) = 288 ± 4 ± 48 µb, in excellent agreement with a previous independent LHCb measurement 3 . 3 Double J/ψ production cross-section The production of two J/ψ’s in the same pp interaction is expected to be rare and can be affected by the existence of charm tetraquark states. At LHCb, the double J/ψ production cross-section has been measured 4 in the fiducial region J/ψ pT ∈ [0;10] GeV/c and y ∈ [2.0;4.5]. A dataset corresponding to an integrated luminosity of 35.2 pb −1 has been used. In selecting the J/ψ candidates, reconstructed from their decays into two muons, particular care has been used to minimize the effect of clone tracks (i.e. two almost identical tracks reconstructed from the same true particle) in order to avoid double counting the same J/ψ. The pile-up effect, which would lead to assigning the same production vertex to J/ψ’s producted in different pp interactions, has been found to be negligible. The number of double J/ψ events has been extracted using a double background subtraction procedure. For every selected (µ + µ − )1, (µ + µ − )2 pair the invariant mass distribution of 1 is obtained in bins of the invariant mass of 2. The fitted yield of 1 in bins of 2 is efficiency corrected event by event and then fitted (see Figure 1 (left)). In order to make the measurement model independent, the per-event efficiency is evaluated in bins of J/ψ pT, y and the angle between the µ + momentum in the J/ψ centre-of-mass frame and the direction of the Lorentz boost from the laboratory frame to the J/ψ centre-of-mass frame. The number of observed double J/ψ candidates before the efficiency correction is 139.6 ± 17.8, corresponding to a statistical significance > 6σ. The measured double J/ψ cross-section in the fiducial region is σ J/ψJ/ψ = 5.6 ± 1.1 ± 1.2 nb where the first uncertainty is statistical and the second is systematic. This result is in good agreement with a LO QCD calculation 5 which predicts 4.34 nb (4.15 nb) with (without) initial state gluon radiations included. A comparison between the measured and predicted double J/ψ invariant mass distributions is shown in Figure 1 (right), where the discrepancy at low invariant mass may be due to non-direct double J/ψ production which is not accounted for by the theoretical model 5 . 4 Υ(1S) production cross-section The Υ(1S), Υ(2S) and Υ(3S) states have been observed from their decays into two muons with sufficient resolution to separate fully the Υ(2S) and Υ(3S) invariant mass peaks (see Figure 2 (left)). The Υ(1S) differential production cross-section as a function of Υ(1S) y and pT has been measured 6 in the fiducial region pT ∈ [0;15] GeV/c and y ∈ [2.0;4.5]. The fiducial region has been divided into bins of width 1 GeV/c in pT and 1 unit of rapidity in y and a dataset corresponding to an integrated luminosity of 32.4 pb −1 has been used. The Υ(1S) yield has been extracted from a fit to the di-muon invariant mass distribution using a Crystal Ball to model the signal shape and an exponential to model the background shape (see
1 20 MeV/c2 dN J/ψ→(µ+ µ − ) 1 corr dm (µ + µ − )2 500 400 300 200 100 LHCb Preliminary √ s = 7 TeV L = 35.2 pb −1 0 3 3.05 3.1 3.15 3.2 m (µ + µ − )2 [GeV/c 2 ] 1 1 GeV/c2 dN corr J/ψJ/ψ dm J/ψJ/ψ 400 350 300 250 200 150 100 50 LHCb Preliminary √ s = 7 TeV L = 35.2 pb −1 0 6 8 10 12 14 mJ/ψJ/ψ [GeV/c 2 ] Figure 1: Left: The efficiency corrected fitted yields of J/ψ → (µ + µ − )1 in bins of (µ + µ − )2 invariant mass. The line represents the fit from a double Crystal Ball function for the signal and an exponential function for the background. Right: The efficiency corrected yields of double J/ψ events as a function of the invariant mass of the double J/ψ system (points with error bars). The overlaid curve corresponds to the theory prediction 5 . ) 2 Candidates/(25 MeV/c 8000 7000 6000 5000 4000 3000 2000 1000 LHCb Preliminary s = 7 TeV -1 ∫ L = 32.4 pb 2 mass (1S)= 9449.2 ± 0.4 MeV/c 2 σ (1S) = 52.4± 0.4 MeV/c Nsignal (1S) = 34429 ± 261 Nsignal (2S) = 8800 ± 181 Nsignal (3S) = 4419 ± 147 0 8000 8500 9000 9500 - 10000 10500 11000 11500 12000 + 2 M( µ µ ) (MeV/c ) [nb/(GeV/c)] dσ(pp→ϒ(1S)X)/dp 2 10 T 10 1 -1 10 LHCb Preliminary s = 7 TeV -1 ∫ L = 32.4 pb LHCb data (2.0
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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
Page 49 and 50: SUSY Searches at the Tevatron Ph. G
Page 51 and 52: on the quality (loose or tight) and
Page 53 and 54: SUSY searches at ATLAS N. Barlow, o
Page 55 and 56: channel. These results are combined
Page 57 and 58: Figure 2: The top left plot shows t
Page 59: 2010 data. Analysis techniques for
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Page 64 and 65: sign leptons is particularly intere
Page 66 and 67: N of events 5 10 DATA 10 4 3 10 10
Page 68 and 69: ) [pb] ν e → B(W’ × σ 10 1 -
Page 70 and 71: 2 Searches in the dijet final state
Page 72 and 73: ing that the neutrinos were the onl
Page 75 and 76: The Quasi-Classical Model in SU(N)
Page 77 and 78: g (γ µ kµ) γ µ Aa µ g (pk)
Page 79: 3. Top
Page 82 and 83: of their vertex with respect to the
Page 84 and 85: of about 9%. 3.1 Differential Cross
Page 86 and 87: Figure 5: Summary of most recent CD
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Page 90 and 91: where f’s are probability functio
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Page 94 and 95: momentum direction of the b quark f
Page 96 and 97: Events 200 150 100 50 -1 DØ L=5.4
Page 98 and 99: after all corrections in the M t¯t
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Page 104 and 105: ATLAS - consists of four parts (mon
Page 106 and 107: 5 D mesons High cross-sections of D
Page 108 and 109: μ +X') [nb/GeV] → b+X → (pp T
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Page 113 and 114: HEAVY FLAVOUR IN A NUTSHELL Robert
Page 115 and 116: Figure 1: Overlapping constraints o
Page 117 and 118: Figure 3: Constraints on new physic
Page 119 and 120: RECENT B PHYSICS RESULTS FROM THE T
Page 121 and 122: (IP) distributions are fitted separ
Page 123 and 124: decays CDF extracts Using a 5.94 fb
Page 125 and 126: Search for B 0 s → µ+ µ − and
Page 127 and 128: Ref. 10,11 . The expected GL distri
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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
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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
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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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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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