1,797 research outputs found

    Combination of Tevatron searches for the standard model Higgs boson in the W+W- decay mode

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    Report number: FERMILAB-PUB-10-017-EWe combine searches by the CDF and D0 collaborations for a Higgs boson decaying to W+W-. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb-1 of p-pbar collisions at sqrt{s}=1.96 TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard-model Higgs boson in the mass range 162-166 GeV at the 95% C.L.We combine searches by the CDF and D0 Collaborations for a Higgs boson decaying to W+W-. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb-1 of pp̅ collisions at √s=1.96  TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard model Higgs boson in the mass range 162–166 GeV at the 95% C.L.Peer reviewe

    Search for R-parity Violating Decays of tau Sneutrinos to emu, mutau, and etau Pairs in ppbar Collisions at sqrt(s) = 1.96 TeV

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    7 pages, 5 figures. To be submitted to Phys. Rev. Lett.We present a search for tau sneutrino production using the Tevatron ppbar collision data collected with the CDF II detector and corresponding to an integrated luminosity of 1 fb^-1. We focus on the scenarios predicted by the R-parity violating (RPV) supersymmetric models in which tau sneutrinos decay to two charged leptons of different flavor. With the data consistent with the standard model expectations, we set the upper limits on sigma(ppbar -> tau sneutrino)*BR(tau sneutrino ->emu,mutau,etau) and use these results to constrain the RPV couplings as a function of tau sneutrino mass.We present a search for supersymmetric neutrino ν˜ production using the Tevatron pp̅ collision data collected with the CDF II detector and corresponding to an integrated luminosity of 1  fb-1. We focus on the scenarios predicted by the R-parity violating (RPV) supersymmetric models in which sneutrinos decay to two charged leptons of different flavor. With the data consistent with the standard model expectations, we set upper limits on σ(pp̅ →ν˜)×BR(ν˜→eμ,μτ,eτ) and use these results to constrain the RPV couplings as a function of the sneutrino mass.Peer reviewe

    Knowledge creation and management in the five LHC experiments at CERN: implications for technology innovation and transfer

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    The present study analyses knowledge creation, acquisition and transfer in the five LHC physics experiments at CERN: ALICE, ATLAS, CMS, LHCb, and TOTEM. A questionnaire was provided during collaboration meetings and a total of 291 replies were obtained and analysed. The results of this research study provide evidence that the social process of participation in meetings, acquisition of skills in different areas, and the development of interests by interaction with colleagues are key elements of the learning process. Furthermore, the results indicate that knowledge acquisition in a multicultural environment plays a mediating role in the interaction between social capital constructs (social interaction, relationship quality, and network ties) and competitive advantage outcomes (invention development and technological distinctiveness). Social interaction, relationship quality, and network ties are connected to greater knowledge acquisition, and also contribute to innovation and transfer of the knowledge to industry. The fertile environment of the five LHC experiments building and managing multiple processes, involves a dynamic, interactive,and simultaneous exchange of knowledge both inside and outside their organization

    Search for the Decays B(s)0e+μ{B^0_{(s)}\to e^+\mu^-} and B(s)0e+e{B^0_{(s)}\to e^+e^-} in CDF Run II

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    submitted to PRLWe report results from a search for the lepton flavor violating decays B(s)0e+μB^0_{(s)}\to e^+\mu^-, and the flavor-changing neutral-current decays B(s)0e+eB^0_{(s)} \to e^+ e^-. The analysis uses data corresponding to 2fb1{\rm 2 fb^{-1}} of integrated luminosity of ppˉp \bar{p} collisions at s=1.96TeV\sqrt{s}=1.96 {\rm TeV} collected with the upgraded Collider Detector (CDF II) at the Fermilab Tevatron. The observed number of B(s)0B^0_{(s)} candidates is consistent with background expectations. The resulting Bayesian upper limits on the branching ratios at 90% credibility level are B(Bs0e+μ)e+μ)e+μ)47.8TeV/c2\mathcal{B}(B^0_s \to e^{+}\mu^{-}) e^{+}\mu^{-})e^{+}\mu^{-}) 47.8 {\rm TeV/c^2}, and MLQ(B0e+μ)>59.3TeV/c2{M_{LQ}}(B^0\to e^+ \mu^-) > 59.3 {\rm TeV/c^2}, at 90% credibility level.We report results from a search for the lepton flavor violating decays Bs0→e+μ- and B0→e+μ-, and the flavor-changing neutral-current decays Bs0→e+e- and B0→e+e-. The analysis uses data corresponding to 2  fb-1 of integrated luminosity of pp̅ collisions at √s=1.96  TeV collected with the upgraded Collider Detector (CDF II) at the Fermilab Tevatron. The observed number of B0 and Bs0 candidates is consistent with background expectations. The resulting Bayesian upper limits on the branching ratios at 90% credibility level are B(Bs0→e+μ-)47.8  TeV/c2, and MLQ(B0→e+μ-)>59.3  TeV/c2, at 90% credibility level.Peer reviewe

    Evidence for non-exponential elastic proton proton differential cross-section at low vertical bar t vertical bar and √ s = 8 TeV by TOTEM

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    The TOTEM experiment has made a precise measurement of the elastic proton proton differential cross-section at the centre-of-mass energy root s = 8 TeV based on a high-statistics data sample obtained with the beta* = 90 m optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. This unprecedented precision allows to exclude a purely exponential differential cross-section in the range of four-momentum transfer squared 0.027 <vertical bar t vertical bar <0.2 GeV2 with a significance greater than 7 sigma. Two extended parametrisations, with quadratic and cubic polynomials in the exponent, are shown to be well compatible with the data. Using them for the differential cross-section extrapolation to t = 0, and further applying the optical theorem, yields total cross-section estimates of (101.5 +/- 2.1) mb and (101.9 +/- 2.1) mb, respectively, in agreement with previous TOTEM measurements. (C) 2015 The Authors. Published by Elsevier B.V.Peer reviewe

    First measurement of elastic, inelastic and total cross-section at √s = 13TeV by TOTEM and overview of cross-section data at LHC energies : TOTEM Collaboration

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    The TOTEM collaboration has measured the proton- proton total cross section at v s = 13 TeV with a luminosity- independent method. Using dedicated ss * = 90m beam optics, the Roman Pots were inserted very close to the beam. The inelastic scattering rate has been measured by the T1 and T2 telescopes during the same LHC fill. After applying the optical theorem the total proton- proton cross section is stot = (110.6 +/- 3.4) mb, well in agreement with the extrapolation from lower energies. This method also allows one to derive the luminosity- independent elastic and inelastic cross sections: sel = (31.0 +/- 1.7) mband sinel = (79.5 +/- 1.8) mb.Peer reviewe

    Short duration of upper extremity lymphedema correlates with a favorable cytokine response after lymph node transfer surgery

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    Vascularized lymph node transfer surgery (VLNT) can provide benefit to lymphedema patients. Cytokines mayplaya role in the development oflymphedema and in the regeneration oflymphatic vessels after VLNT. Ourprimary aim was to investigate whether the VLNTpatients have a specific cytokine profile. Our secondary aim was to see whether the preoperative lymphedema or severity affects the postoperative cytokine response. Wound exudate was gathered from 18 patients undergoing VLNT on the first and sixth postoperative day (POD). The concentrations of IL-10, TNF-alpha, TGF-beta 1 and VEGF-C were analyzed using enzyme-inked immune-sorbent assays. A general score was generated to assess the benefit ofthe surgery. The changes in cytokine concentrations (1(st) POD-6th POD) were correlated with the pre- andpostoperative lymphedema related factors. A shorter duration oflymphedema preoperatively correlated with an increase in the concentration of IL-10 and TNF-beta during the first six PODs (IL-10: r=0.495, p=0.051; TNF-alpha: p=0.006) and a decrease in the concentration of 7VF-111 (r= p=0.020). The increase ofthe concentration of TNF-alpha during the first six PODs also correlated with a greater total general score (r=0.775, p=0.005) and hence indicated a better response to the surgery. The patients with a shorter duration oflymphedema preoperatively had a more favorable cytokine response during the first six PODs after VLNT

    Diffraction and Total Cross-Section at the Tevatron and the LHC

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    At the Tevatron, the total p_bar-p cross-section has been measured by CDF at 546 GeV and 1.8 TeV, and by E710/E811 at 1.8 TeV. The two results at 1.8 TeV disagree by 2.6 standard deviations, introducing big uncertainties into extrapolations to higher energies. At the LHC, the TOTEM collaboration is preparing to resolve the ambiguity by measuring the total p-p cross-section with a precision of about 1 %. Like at the Tevatron experiments, the luminosity-independent method based on the Optical Theorem will be used. The Tevatron experiments have also performed a vast range of studies about soft and hard diffractive events, partly with antiproton tagging by Roman Pots, partly with rapidity gap tagging. At the LHC, the combined CMS/TOTEM experiments will carry out their diffractive programme with an unprecedented rapidity coverage and Roman Pot spectrometers on both sides of the interaction point. The physics menu comprises detailed studies of soft diffractive differential cross-sections, diffractive structure functions, rapidity gap survival and exclusive central production by Double Pomeron Exchange.Peer reviewe

    First Results from the TOTEM Experiment

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    The first physics results from the TOTEM experiment are here reported, concerning the measurements of the total, differential elastic, elastic and inelastic pp cross-section at the LHC energy of s\sqrt{s} = 7 TeV, obtained using the luminosity measurement from CMS. A preliminary measurement of the forward charged particle η\eta distribution is also shown.Comment: Conference Proceeding. MPI@LHC 2010: 2nd International Workshop on Multiple Partonic Interactions at the LHC. Glasgow (UK), 29th of November to the 3rd of December 201

    Double diffractive cross-section measurement in the forward region at LHC

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    The first double diffractive cross-section measurement in the very forward region has been carried out by the TOTEM experiment at the LHC with center-of-mass energy of sqrt(s)=7 TeV. By utilizing the very forward TOTEM tracking detectors T1 and T2, which extend up to |eta|=6.5, a clean sample of double diffractive pp events was extracted. From these events, we measured the cross-section sigma_DD =(116 +- 25) mub for events where both diffractive systems have 4.7 <|eta|_min < 6.5 .Comment: 5 pages, 1 figure, submitted for publicatio
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