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

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3 Summary A brief overview of recent results from the HERA collider published by the H1 and ZEUS collaborations is given. The measurements provide information on the parton structure of the proton and precise measurement of the strong coupling constant αs. High energy diffraction keeps being a very interesting field for QCD studies. Further understanding of rapidity gap suppression mechanism is required for the ongoing and future collider experiment programs. References 1. Yu. L. Dokshitzer. Sov.Phys. JETP, 46:641 (1977); V.N. Gribov, L,N. Lipatov. Sov.J.Nucl.Phys. 15:438 (1972); G. Altarelli and G. Parisi. Nucl. Phys. B126:298 (1977). 2. Inclusive-jet cross sections in photoproduction, ZEUS-prel-10-003; Inclusive-jet cross sections in photoproduction at HERA and a comparison of the kt, anti-kt and SIScone jet algorithms, ZEUS-prel-10-015. 3. Inclusive-jet production in NC DIS with HERA II, ZEUS-prel-10-002. 4. M. Cacciari, G. P. Salam and G. Soyez, ”The anti-kt jet clustering algorithm”, JHEP 0804 (2008) 063 [arXiv:0802.1189]. 5. G. P. Salam and G. Soyez, JHEP 0705 (2007) 086 [arXiv:0704.0292] 6. Dijets in γp and constraints on p and gamma PDFs, ZEUS-prel-10-014 7. HERAPDF 1.6, H1prelim-11-034, ZEUS-prel-11-001 8. J.Collins, PR D57 (1998) 3051. 9. Measurement of the Diffractive Deep-Inelastic Scattering Cross Section with a Leading Proton at HERA, Eur.Phys.J.C71:1578,2011, (arXiv:1010.1476v1) measurement with LRG, H1prelim-10-011. 11. Diffractive structure function F D(3) 2 measurement with VFPS, H1prelim-10-014. 12. Measurement of the Diffractive Deep-Inelastic Scattering Cross Section with a Leading Proton at HERA 13. Measurement of the longitudinal diffractive structure function F D L at low Q2 at HERA, H1prelim-10-017, H1prelim-09-011. 14. C. Adloff et al. [H1 Collaboration], Eur. Phys. J. C 20 (2001) 29 [hep-ex/0012051]; S. Chekanov et al. [ZEUS Collaboration], Eur. Phys. J. C 52 (2007) 813 [arXiv:0708.1415]. 15. A. Aktas et al. [H1 Collaboration], Eur. Phys. J. C 50 (2007) 1 [hep-ex/0610076]; S. Chekanov et al. [ZEUS Collaboration], Nucl. Phys. B 672 (2003) 3 [hep-ex/0307068]. 16. A. Affolder et al. [CDF Collaboration], Phys. Rev. Lett. 84 (2000) 5043. 17. M. Klasen and G. Kramer, Phys. Rev. D 80 (2009) 074006 [arXiv:0908.2531]. 18. A. Kaidalov, V. Khoze, A. Martin and M. Ryskin, Phys. Lett. B 567 (2003) 61 [hepph/0306134]. 19. A. Kaidalov, V. Khoze, A. Martin and M. Ryskin, Eur. Phys. J. C 66 (2010) 373 [arXiv:0911.3716]. 20. M. Klasen and G. Kramer, Eur. Phys. J. C 38 (2004) 93 [hep-ph/0408203]. 21. Diffractive Dijet Photoproduction in ep Collisions at HERA, Eur.Phys.J.C70:15-37,2010 [arXiv:1006.0946] 22. Diffractive Jet Production in Deep-Inelastic Scattering with a Leading proton at HERA-2, H1prelim-10-013 23. Diffractive Υ(1S) photoproduction t-slope measurement, ZEUS-prel-10-020. 10. Diffractive structure function F D(3) 2
(a) (b) (c) Figure 2: a) Reduced cross section measured by proton spectrometers, FPS and VFPS, and LRG method. b) The ratio of the measured to the predicted diffractive dijet cross sections as function of the photon momentum fraction xγ after the ”gap suppression” correction implementation. The NLO QCD predicted cross section was done based on the FR framework and the H1 2006 Fit B DPDF set, corrected for hadronisation effects. The FR theoretical prediction for resolved photons is modified by applying the scale factors from the KKMR model for pointlike interactions (KKMR suppressed) 18 or for hadron-like interactions (resolved 0.34) 19 . c) Diffractive process t-slope, b, for light and heavy vector mesons measured at different Q 2 values. The value b is expected to be a sum of two components coming from the vector meson, bV , and the proton, bp.
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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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¦ § ¦ ¨ ¥ ¦ ¨ § ¦ © ¦ §
Page 239 and 240: Figure 4: Two-dimensional distribut
Page 241 and 242: SOFT QCD RESULTS FROM ATLAS AND CMS
Page 243 and 244: as a function of multiplicity for t
Page 245 and 246: Determination of αS using hadronic
Page 247 and 248: α S (m Z 0) 0.15 0.14 0.13 0.12 0.
Page 249 and 250: Reaching beyond NLO in processes wi
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Page 253 and 254: Nonlocal Condensate Model for QCD S
Page 255 and 256: The lower bound for the integration
Page 257 and 258: AN ALTERNATIVE SUBTRACTION SCHEME F
Page 259 and 260: where MBorn,g is the underlying Bor
Page 261 and 262: THE NNPDF2.1 PARTON SET F. CERUTTI
Page 263 and 264: ottom masses mb of 4.25, 4.5, 5.0 a
Page 265 and 266: HOLOGRAPHIC DESCRIPTION OF HADRONS
Page 267 and 268: ∫ SYM = κ d 4 ( 1 xdzTr 2 h(z)F
Page 269 and 270: Nuclear matter and chiral phase tra
Page 271 and 272: fact that for Nc ≫ 3 a gas of fre
Page 273 and 274: Recent Results on Light Hadron Spec
Page 275 and 276: Figure 3: Mass spectrum fitting wit
Page 277 and 278: MEASUREMENT OF THE J/ψ INCLUSIVE P
Page 279 and 280: 2 Counts per 40 MeV/c 120 100 80 60
Page 281 and 282: STUDY OF Ke4 DECAYS IN THE NA48/2 E
Page 283 and 284: photons were accepted while particl
Page 285: 6. Structure Functions Diffraction
Page 288 and 289: 2 Hadronic Final States and Diffrac
Page 293 and 294: Using HERA Data to Determine the In
Page 295 and 296: k f n 0.4 0.2 0 -0.2 0.4 0.2 0 -0.2
Page 297: The singular term, on the other han
Page 301 and 302: Pomeron Kernel: The leading order B
Page 303 and 304: DIFFRACTION, SATURATION AND pp CROS
Page 305 and 306: In Ref. 6 , the saturated Froissart
Page 307 and 308: Transverse Energy Flow with Forward
Page 309 and 310: 1/N d dE t /dη 0.1 0.09 0.08 0.07
Page 311: 7. Heavy Ions
Page 314 and 315: dη)/(0.5〈 N 〉 ) part ch (dN 10
Page 316 and 317: ) 3 (fm long R side R out R 400 350
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Page 320 and 321: Away-side gaussian width 1.4 1.2 1
Page 322 and 323: Figure 1: (a) J/ψ rapidity distrib
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Page 328 and 329: AA,Pythia I 2.5 2.0 1.5 1.0 0.5 0.0
Page 330 and 331: (1/N ) dN/dA evt J φ Δ ) dN/d (1/
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Page 334 and 335: 3 Results 3.1 Dijet Properties in p
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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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