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GeV/c) µ dy ( T /dp 2 σJ/ ψ d 10 1 -1 -2 10 + - ALICE e e, |y|
STUDY OF Ke4 DECAYS IN THE NA48/2 EXPERIMENT AT CERN B. BLOCH-DEVAUX Department of Physics, Università degli Studi di Torino, via P.Giuria 1, 10125 Torino, Italy Large samples of kaon decays have been collected in 2003 − 2004 by the NA48/2 collaboration in the charged (K ± → π + π − e ± ν) and neutral (K ± → π 0 π 0 e ± ν) Ke4 modes. In the charged mode, form factors have been extensively studied from a sample of more than one million decays and a preliminary branching ratio measurement is reported here. In the neutral mode, a sample of 44 000 decays has been analyzed and provides a new branching ratio value with 1 − 2% precision, a factor of ten improvement with respect to the current knowledge. Both modes contribute to the study of low energy QCD and are powerful tests of Chiral Perturbation Theory predictions. 1 Introduction Kaon decays have been identified as a perfect laboratory to study low energy strong interaction. Semileptonic four-body decays are of particular interest because of the small number of hadrons in the final state which are related to the study of ππ interaction. The development of chiral perturbation theory (ChPT) 1 over more than 30 years has reached a competitive precision level in its predictions of both ππ scattering lengths values and form factors appearing in the weak hadronic current of the Ke4 decay matrix element. The global analysis of ππ, πK and Ke4 data allows the determination of the Low Energy Constants (LEC) of ChPT at Leading and Next to Leading Orders (LO,NLO,NNLO) 2,3 and subsequent predictions of form factors and decay rates. Current experimental measurements 4 and NA48/2 improved sensitivity are shown in Table 1. The possibility to study high statistics samples collected concurrently by NA48/2 in several modes will bring improved inputs and will allow stronger tests of ChPT predictions. Table 1: Number of analyzed Ke4 events, measured decay rates and NA48/2 improvements for the two reported modes. Relative errors are given within parentheses. 2 Kinematics Decay mode PDG 2010 This measurement K + → π + π − e + νe 418 000 3304 ± 81 (2.4%) 1.11 10 6 28 (0.8%) K + → π 0 π 0 e + νe 37 1777 ± 323 (18.2%) 44 000 34 (1.6%) The Ke4 decay is fully described by the five kinematic Cabibbo-Maksymowicz variables 7 : two invariant masses Sπ = M 2 ππ and Se = M 2 eν and three angles θπ, θe and φ. Form factors can be developed in a partial wave expansion 8 . Limiting the expansion to S- and P- wave and considering
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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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Page 231 and 232: TEVATRON RESULTS ON MULTI-PARTON IN
Page 233 and 234: iterative midpoint cone algorithm w
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
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
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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
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Page 265 and 266: HOLOGRAPHIC DESCRIPTION OF HADRONS
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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
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Page 277 and 278: MEASUREMENT OF THE J/ψ INCLUSIVE P
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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 290 and 291: 3 Summary A brief overview of recen
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
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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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