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

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Figure 5: Differential transverse momentum cross section for single muons in −4 < η < −2.5. The statistical error is smaller than the markers. The systematic errors (open boxes) do not include an additional 10% error on the minimum-bias pp cross section. The yellow band indicates the FONLL prediction. muons from the decay of hadrons produced in the interaction with the front absorber (secondary muons); c) punch-through hadrons. The last contribution can be efficiently rejected by requiring the matching of the reconstructed tracks with the tracks in the trigger system. Due to the lower mass of the parent particles, the background muons have a softer pT distribution than the heavy-flavour muons, and dominate the low-pT region. Therefore, the analysis is restricted to the pT range 2-6.5 GeV/c, where the upper limit is being determined by the current pT resolution of spectrometer with partial alignment. Simulation studies indicate that, in this pT range, the contribution of secondary muons is small (about 3%). The main source of background in this region consists of decay muons (about 25%), which have been subtracted using Monte Carlo simulations. Figure ?? illustrates the single muon pT cross section after corrections. The systematic uncertainties are 20-25%. The FONLL calculation ? agrees with the data within uncertainties. 6 Summary Recent ALICE results on open charmed mesons and single leptons in pp collisions at 7 TeV are presented. The production cross-section of single electrons, single muons and D mesons are measured up to pT = 4, 6.5 and 12 GeV/c, respectively, and show good agreement with NLO pQCD calculations. First D meson signals are shown for Pb–Pb collisions at √ sNN = 2.76 TeV. Acknowledgments The European Research Council has provided financial support under the European Community’s Seventh Framework Programme (FP7/2007-2013) / ERC grant agreement no 210223. This work was supported in part by a Vidi grant from the Netherlands Organisation for Scientific Research (project number 680-47-232). References 1. P. Cortese et al. [ALICE Collaboration], J. Phys. G: Nucl. Part. Phys. 32, 1295 (2006). 2. K. Aamodt et al. [ALICE Collaboration], J. Instrum. 3, S08002 (2008). 3. K. Aamodt et al. [ALICE Collaboration], Phys. Rev. Lett. 105, 252301 (2010). 4. K. Aamodt et al. [ALICE Collaboration], J. Instrum. 5, P03003 (2010). 5. A. Grelli for the ALICE Collaboration, PoS (ICHEP 2010) 191. 6. M. Cacciari et al., private communication. 7. B.A. Kniehl et al., private communication.
Direct Photons and Photon-Hadron Correlations at PHENIX B. Sahlmueller a Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11790, USA Direct photons are a powerful tool to study the hot and dense matter created in heavyion collisions at RHIC, since they are created in the different stages of the collision. Since they do not interact via the strong force, they can travel through the hot and dense matter mostly unaffected. The PHENIX experiment has measured direct photons using different methods, over a broad range of transverse momentum (pT), in different collision systems, and at different energies. These measurements help interpreting the measurement of hadrons as well as understanding the temperature of the created quark-gluon plasma (QGP). The azimuthal anisotropy of direct photons may shed light on the thermalization time of the medium. Using direct photons to tag jets is a crucial tool to understand the energy loss of scattered partons in the medium. The experimental program at the Relativistic Heavy-Ion Collider has found evidence for the creation of a quark-gluon plasma in collisions of Au nuclei at center-of-mass energies of 200 GeV per nucleon. 1 One of the crucial signatures are direct photons that are produced in such collisions and can traverse the created QGP mostly unaffected. Direct photons are defined as photons that are not from decays of hadrons, such as π 0 or η. These photons are produced in different stages of a heavy-ion collision over a broad range of transverse momentum. At large and intermediate transverse momentum (pT) they are produced mainly from initial hard scattering processes of the colliding quarks or gluons such as q + g → q + γ or q + ¯q → g + γ, as bremsstrahlung emitted by a scattered parton, from the fragmentation of such quarks and gluons, or from the interaction of a scattered parton with the strongly interacting medium created in such collisions 2 . In the hard scattering processes, a parton is emitted opposite to the photon, that will subsequently fragment into a hadronic jet. Hence, the energy of the jet is balanced with the energy of the direct photon on the opposite side. At low pT, the medium can emit thermal direct photons directly. Their pT distribution depends on the average temperature of the medium. 3 To account for nuclear effects, the direct photon yield in Au+Au collisions is compared to the cross section in p+p collisions with the help of the nuclear modification factor which is defined as RAA = d2 N/dpTdy|AuAu 〈TAA〉d 2 σ pp /dpTdy , (1) where 〈TAA〉 is the nuclear overlap function. The azimuthal anisotropy of direct photons is sensitive to the different production processes, itismeasuredintermsoftheanisotropyparameterv2 whichisthesecondharmonicoftheFourier a for the PHENIX collaboration
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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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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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