Journal: Physics Letters B

Abbreviation

Phys. Lett. B

Publisher

Elsevier

Journal Volumes

ISSN

0370-2693
0031-9163
1873-2445

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Publications1 - 10 of 402
  • Exclusive production of pion and kaon meson pairs in two-photon collisions at LEP
    Item type: Journal Article
    ALEPH Collaboration; Heister, Arno; Dissertori, Günther; et al. (2003)
    Physics Letters B
  • Inclusive search for a vector-like T quark with charge 2/3 in pp collisions at sqrt(s) = 8 TeV
    Item type: Journal Article
    CMS Collaboration; Chatrchyan, Serguei; Bachmair, Felix; et al. (2014)
    Physics Letters B
    A search is performed for a massive new vector-like quark T, with charge 2/3, that is pair produced together with its antiparticle in proton–proton collisions. The data were collected by the CMS experiment at the Large Hadron Collider in 2012 at s=8TeV and correspond to an integrated luminosity of 19.5fb−1. The T quark is assumed to decay into three different final states, bW, tZ, and tH. The search is carried out using events with at least one isolated lepton. No deviations from standard model expectations are observed, and lower limits are set on the T quark mass at 95% confidence level. The lower limit lies between 687 and 782 GeV for all possible values of the branching fractions into the three different final states assuming strong production. These limits are the most stringent constraints to date on the existence of such a quark.
  • Measurement of angular parameters from the decay B0→K∗0𝜇+𝜇− in proton-proton collisions at 𝑠√= 8 TeV
    Item type: Journal Article
    CMS Collaboration; Sirunyan, Albert M.; Backhaus, Malte; et al. (2018)
    Physics Letters B
    Angular distributions of the decay B0→K⁎0μ+μ− are studied using a sample of proton–proton collisions at s=8TeV collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 20.5fb−1. An angular analysis is performed to determine the P1 and P5 ′ parameters, where the P5 ′ parameter is of particular interest because of recent measurements that indicate a potential discrepancy with the standard model predictions. Based on a sample of 1397 signal events, the P1 and P5 ′ parameters are determined as a function of the dimuon invariant mass squared. The measurements are in agreement with predictions based on the standard model.
  • Search for quark contact interactions and extra spatial dimensions using dijet angular distributions in proton-proton collisions at √s = 8 TeV
    Item type: Journal Article
    CMS Collaboration; Khachatryan, Vardan; Bachmair, Felix; et al. (2015)
    Physics Letters B
    A search is presented for quark contact interactions and extra spatial dimensions in proton-proton collisions at root s = 8 TeV using dijet angular distributions. The search is based on a data set corresponding to an integrated luminosity of 19.7 fb(-1) collected by the CMS detector at the CERN LHC. Dijet angular distributions are found to be in agreement with the perturbative QCD predictions that include electroweak corrections. Limits on the contact interaction scale from a variety of models at next-to-leading order in QCD corrections are obtained. A benchmark model in which only left-handed quarks participate is excluded up to a scale of 9.0 (11.7) TeV for destructive (constructive) interference at 95% confidence level. Lower limits between 5.9 and 8.4 TeV on the scale of virtual graviton exchange are extracted for the Arkani-Hamed-Dimopoulos-Dvali model of extra spatial dimensions.
  • Transverse momentum spectra of inclusive b jets in pPb collisions at √sNN=5.02TeV
    Item type: Journal Article
    CMS Collaboration; Khachatryan, Vardan; Bachmair, Felix; et al. (2016)
    Physics Letters B
    We present a measurement of b jet transverse momentum (pT) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 nb−1 collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon–nucleon collisions and are compared to a reference obtained from PYTHIA simulations of pp collisions. The PYTHIA-based estimate of the nuclear modification factor is found to be 1.22±0.15(stat+syst pPb)±0.27(syst PYTHIA) averaged over all jets with pT between 55 and 400 GeV/c and with |ηlab|<2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.
  • Measurement of exclusive ρ0 ρ0 production in mid-virtuality two-photon interactions at LEP
    Item type: Journal Article
    L3 Collaboration; Achard, Pablo; Anderhub, Hans-Bruno; et al. (2004)
    Physics Letters B
  • Search for pair produced fourth-generation up-type quarks in pp collisions at √s=7  TeV with a lepton in the final state
    Item type: Journal Article
    CMS Collaboration; Chatrchyan, Serguei; Bäni, Lukas; et al. (2012)
    Physics Letters B
    The results of a search for the pair production of a fourth-generation up-type quark (t') in proton-proton collisions at √s=7 TeV are presented, using data corresponding to an integrated luminosity of about 5.0 fb -1 collected by the Compact Muon Solenoid experiment at the LHC. The t' quark is assumed to decay exclusively to a W boson and a b quark. Events with a single isolated electron or muon, missing transverse momentum, and at least four hadronic jets, of which at least one must be identified as a b jet, are selected. No significant excess of events over standard model expectations is observed. Upper limits for the t't' production cross section at 95% confidence level are set as a function of t' mass, and t'-quark production for masses below 570 GeV is excluded. The search is equally sensitive to nonchiral heavy quarks decaying to Wb. In this case, the results can be interpreted as upper limits on the production cross section times the branching fraction to Wb.
  • Photoproduction of dijets with high transverse momenta at HERA
    Item type: Journal Article
    H1 Collaboration; Aktas, Adil; Del Degan, Marc A.; et al. (2006)
    Physics Letters B
  • Search for heavy gauge W' boson in events with an energetic lepton and large missing transverse momentum at s√= 13 TeV
    Item type: Journal Article
    CMS Collaboration; Khachatryan, Vardan; Bachmair, Felix; et al. (2017)
    Physics Letters B
  • Search for single top quark production at HERA
    Item type: Journal Article
    H1 Collaboration; Aaron, Francise D.; Del Degan, Marc; et al. (2009)
    Physics Letters B
Publications1 - 10 of 402