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

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Figure 1: The pp mass spectrum for the ψ ′ → π + π − J/ψ(γpp) after final event selection. The solid curve is the fit result; the dashed curve shows the fitted background function, and the dash-dotted curve indicates how the acceptance varies with pp invariant mass. 3 Observation of X(1835) and Two New Resonances in J/ψ → γη ′ π + π − X(1835) is first observed in the study of J/ψ → γη ′ π + π − at BESII with a statistical significance of 7.7σ 7 . Extensive theoretical interpretations have been raised to settle the nature of this resonance, such as the pp bound state 8 , glueball 9 , radial excitation of η ′ 10 and so on. At BESIII, two decay modes of η ′ , η ′ → γρ and η ′ → ηπ + π − are utilized to study the channel of J/ψ → γη ′ π + π − . Fig. 2(a) and Fig. 2(b) show the mass spectrum of η ′ π + π − in both decay modes of η ′ . In addition to the clear X(1835) peak, two structures located at around 2.1 and 2.3 GeV/c 2 are also first observed. (a) (b) Figure 2: (a) is the mass spectrum of η ′ π + π − with η ′ → γρ; (b) is the mass spectrum of η ′ π + π − with η ′ → ηπ + π − . The dots with error bars shows the data, and the blue histogram in (a) and (b) stands for the distribution of arbitrarily normalized phase space Monte Carlo sample. Fig. 3 shows the fitting result of the η ′ π + π − mass spectrum with the contribution of two decay modes of η ′ combined together. The existence of X(1835) is confirmed with a significance of larger than 20σ. The statistical significance of X(2120) and X(2370) are determined to be 7.2σ and 6.4σ respectively. 4 Observation of X(1870) in J/ψ → ωηπ + π − X(1835) is reported in the analysis of J/ψ → γη ′ π + π − as covered in the last section. The study of the decay patterns of the resonance, i.e. to search for similar structures in relative channels and with other side particles is very important to clarify its nature. In this sense, the analysis of J/ψ → ωηπ + π − will shed light on the properties of the resonance.
Figure 3: Mass spectrum fitting with four resonances. The dash-dotted red curve is the contribution from non-η ′ events and J/ψ → π 0 η ′ π + π − events, and the dashed black curve represents the total background. Fig. 4 shows the fitting result of ηπ + π− mass spectrum within the a0 0 (980) signal region in M(ηπ ± ). The signal peaks of f1(1285), η(1405) and X(1870) are parameterized with efficiencycorrected Breit-Wigner function convoluted with Gaussian resolution function, and the background curve is described by a floating polynomial. The mass and width of f1(1285) and η(1405) agree quite well with their PDG values 11 . The fit yields the mass and width of X(1870) to be M = 1877.3 ± 6.3 MeV/c2 , and Γ = 57 ± 12MeV/c2 . The statistical significance of X(1870) is conservatively estimated as 7.1σ. Whether the X(1870), X(1860) and X(1835) are the same particle need further study. Figure 4: Mass spectrum fitting results with either ηπ + or ηπ − located in the 100 MeV/c2 mass window of a0(980). The yellow dashed curve shows the contribution of non-ω and/or non-a0(980) background, green dashed line in addition includes the contribution of J/ψ → b1(1235)a0(980), the black dashed curve stands for the total background with the non-resonant J/ψ → ωa ± 0 (980)π∓ included. 5 Study of a 0 0 (980) − f0(980) Mixing The nature of the scalar mesons a 0 0 (980) and f0(980) has been a hot topic in light hadron physics for many years. The possibility of mixing between a 0 0 (980) and f0(980) was suggested long ago, and its measurement will shed light on the nature of these two resonances 12 . There has been various theoretical predications with various models, yet no firm experimental evidence is available. The most significant signature of this isospin-violating mixing process is a very narrow peak of about 8 MeV/c2 in the mass spectrum of a 0 0 (980)/f0(980) 13 . At BESIII, we perform a direct measurement of a 0 0 (980) ↔ f0(980) mixing intensity via the process of J/ψ → ϕf0(980) → ϕa 0 0 (980) → ϕηπ0 and χc1 → π 0 a 0 0 (980) → π0 f0(980) → π 0 π + π − . For the decay of J/ψ → ϕf0(980) → ϕa 0 0 (980) → ϕηπ0 , a simultaneous fit is performed to
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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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Page 231 and 232: TEVATRON RESULTS ON MULTI-PARTON IN
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Page 235 and 236: 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
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Page 249 and 250: Reaching beyond NLO in processes wi
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Page 253 and 254: Nonlocal Condensate Model for QCD S
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Page 265 and 266: HOLOGRAPHIC DESCRIPTION OF HADRONS
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Page 273: Recent Results on Light Hadron Spec
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Page 281 and 282: STUDY OF Ke4 DECAYS IN THE NA48/2 E
Page 283 and 284: photons were accepted while particl
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Page 290 and 291: 3 Summary A brief overview of recen
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Page 297: The singular term, on the other han
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Page 303 and 304: DIFFRACTION, SATURATION AND pp CROS
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Page 311: 7. Heavy Ions
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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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