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2 Events / 20 MeV/c 50 40 30 20 10 0 LHCb Preliminary s = 7 TeV 6100 6200 6300 6400 6500 ± 2 M(J/ ψπ ) (MeV/c ) 2 Events / 10 MeV/c 1200 1000 800 600 400 200 0 LHCb Preliminary s = 7 TeV 5200 5300 5400 5500 ± 2 M(J/ ψK ) (MeV/c ) Figure 3: The invariant mass distribution for B + c → J/ψ(µ + µ − ) π + (left) and B + → J/ψ K + (right) candidates, with the fit results superimposed. The blue solid line represents the total fit function, the red dashed line the signal contribution, the green dashed line the combinatorial background contribution. For the B + → J/ψ K + mass distribution, the red solid line represents the background from Cabibbo-suppressed B + → J/ψ π + decays. The analysis has been performed in the fiducial region B pT > 4 GeV/c and B pseudo-rapidity η ∈ [2.5;4.5] using 32.5 pb−1 of integrated luminosity. The B + c and B+ selection criteria have been chosen to be as similar as possible to reduce the systematic uncertainties on Rc +. The number of B + c and B + have been extracted from a fit to the J/ψ π and J/ψ K invariant mass distributions (see Figure 3). In both cases a Gaussian shape has been used for the signal and an exponential shape has been used for the combinatorial background. The non-combinatorial background from the Cabibbo suppressed decay B + → J/ψ π + has also been taken into account. Since the B + c production spectrum and lifetime are poorly known, the efficiency has been evaluated from Monte Carlo simulation in bins of B pT and η to reduce the dependence on theoretical models. The measured Rc + in the fiducial region is Rc + = (2.2 ± 0.8 ± 0.2)% where the first uncertainty is statistical and the second is systematic. A model dependant approach obtained with the B + c generator BCVEGPY 10 (i.e. a complete LO α 4 s PDF gives R model-dependant c + 6 Conclusions = (1.4 ± 0.4 ± 0.1)%. calculation) and the CTEQ6LL 11 With the 2010 data the differential production cross-sections of J/ψ and Υ(1S) and the production cross-section of double J/ψ and B + c (relative to B + ) have been measured with the LHCb detector. The results are in good agreement with the theoretical calculations and the observation of the B + c looks very promising for future measurements. References 1. The LHCb Collaboration, A.A. Alves et al, JINST 3, S08005 (2008). 2. The LHCb Collaboration, R. Aaij et al, arXiv:1103.0423v1 [hep-ex]. 3. The LHCb Collaboration, R. Aaij et al, Phys. Lett. B 694, 209 (2010). 4. The LHCb Collaboration, R. Aaij et al, CERN-LHCb-CONF-2011-009. 5. A.V. Berezhnoy et al, arXiv:1101.5881v1 [hep-ph]. 6. The LHCb Collaboration, R. Aaij et al, CERN-LHCb-CONF-2011-016. 7. K. Wang, Y.Q. Ma, K.T. Chao, private communication. 8. The CMS Collaboration, arXiv:1012.5545v1. 9. The LHCb Collaboration, R. Aaij et al, CERN-LHCb-CONF-2011-017. 10. Chao-Hsi Chang, Jian-Xiong Wang, Xing-Gang Wu, Comput.Phys.Commun. 175, 624 (2006). 11. J. Pumplin et al, JHEP 0207, 012 (2002).
HEAVY FLAVOUR PRODUCTION AT ATLAS Z. DOLE ˇ ZAL on behalf of the ATLAS Collaboration Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University in Prague, V Holeˇsovičkách 2, CZ 18000 Prague, The Czech Republic ATLAS is a general purpose detector built at the Large Hadron Collider at CERN, Geneva. In addition to the high pT program it has a rich flavour physics program. Latest results of heavy flavour production in ATLAS are presented, focusing on D and B meson production and J/ψ prompt and indirect cross-section measurements. 1 Introduction ATLAS is a general purpose detector built at the Large Hadron Collider at CERN, Geneva. Its main objective is to search for physics beyond the Standard Model. In addition to this program it has a rich flavour physics program as well. Flavour-related processes serve also as a very useful tool to understand detector performance using well known particles with c and b quarks and measurements of production cross-sections for D hadrons, B hadrons, J/ψ and Υ to test QCD predictions for proton-proton (pp) collisions at √ s = 7 TeV. With higher statistics (several fb −1 expected in 2011 and 2012) properties of B hadrons and other interesting observables will be measured. 2 ATLAS Detector and Triggers A detailed description of the ATLAS detector can be found here 1 . Only the most important parts of the nominal detector relevant for flavour physics studies are described in this paper. The Inner Detector uses its magnetic field of 2 T to measure charged particle tracks in a pseudorapidity range of |η| < 2.5. In the barrel region it consists of 3 pixel layers followed by 4 silicon strip detector layers and the Transition Radiation Tracker allowing to reach design momentum precision of σpT /pT = 0.05%pT ⊕1%. Muon detector system (MS) - the outermost detector of
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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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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
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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
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Page 84 and 85: of about 9%. 3.1 Differential Cross
Page 86 and 87: Figure 5: Summary of most recent CD
Page 88 and 89: the minimum number of jets identifi
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
Page 100 and 101: for prompt J/ψ under the fully tra
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
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
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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
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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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