Catalogue Search | MBRL
Search Results Heading
Explore the vast range of titles available.
MBRLSearchResults
-
DisciplineDiscipline
-
Is Peer ReviewedIs Peer Reviewed
-
Item TypeItem Type
-
SubjectSubject
-
YearFrom:-To:
-
More FiltersMore FiltersSourceLanguage
Done
Filters
Reset
544
result(s) for
"Wulz, C.-E."
Sort by:
Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at ... TeV
2016
An analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum (p sub(T)) surrounding dijet systems is measured by selecting charged particles in different ranges of p sub(T) and at different angular cones of pseudorapidity and azimuth. The measurement is performed as a function of centrality of the PbPb collisions, the p sub(T) asymmetry of the jets in the dijet pair, and the distance parameter R used in the anti-k sub(T) jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show an enhanced multiplicity in the hemisphere of the subleading jet, with the p sub(T) imbalance compensated by an excess of low-p sub(T) particles at large angles from the jet axes. [Figure not available: see fulltext.]
Journal Article
Measurement of pseudorapidity distributions of charged particles in proton-proton collisions at ... TeV by the CMS and TOTEM experiments
2014
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).Pseudorapidity (...) distributions of charged particles produced in proton-proton collisions at a centre-of-mass energy of 8... are measured in the ranges ... and ... covered by the CMS and TOTEM detectors, respectively. The data correspond to an integrated luminosity of ... ... Measurements are presented for three event categories. The most inclusive category is sensitive to 91-96 % of the total inelastic proton-proton cross section. The other two categories are disjoint subsets of the inclusive sample that are either enhanced or depleted in single diffractive dissociation events. The data are compared to models used to describe high-energy hadronic interactions. None of the models considered provide a consistent description of the measured distributions.
Journal Article
Search for a light charged Higgs boson decaying to ... in pp collisions at ... TeV
2015
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).A search for a light charged Higgs boson, originating from the decay of a top quark and subsequently decaying into a charm quark and a strange antiquark, is presented. The data used in the analysis correspond to an integrated luminosity of 19.7 fb super(-1) recorded in proton-proton collisions at ... TeV by the CMS experiment at the LHC. The search is performed in the process ..., where the W boson decays to a lepton (electron or muon) and a neutrino. The decays lead to a final state comprising an isolated lepton, at least four jets and large missing transverse energy. No significant deviation is observed in the data with respect to the standard model predictions, and model-independent upper limits are set on the branching fraction ..., ranging from 1.2 to 6.5% for a charged Higgs boson with mass between 90 and 160 GeV, under the assumption that ... [Figure not available: see fulltext.]
Journal Article
Status and commissioning of the CMS experiment
2008
The construction status of the CMS experiment at the Large Hadron Collider and strategies for commissioning the subdetectors, the magnet, the trigger and the data acquisition are described. The first operations of CMS as a unified system, using either cosmic rays or test data, and the planned activities until the startup of the LHC are presented.
Journal Article
Measurement of electroweak production of a $$\\mathrm{W} $$ W boson in association with two jets in proton–proton collisions at $$\\sqrt{s}=13\\,\\text {Te}\\text {V} $$ s=13Te
2020
A measurement is presented of electroweak (EW) production of a $$\\mathrm{W} $$ W boson in association with two jets in proton–proton collisions at $$\\sqrt{s}=13\\,\\text {Te}\\text {V} $$ s=13Te. The data sample was recorded by the CMS Collaboration at the LHC and corresponds to an integrated luminosity of 35.9 $$\\,\\text {fb}^{-1}$$ fb-1. The measurement is performed for the $$\\ell \\nu $$ ℓνjj final state (with $$\\ell \\nu $$ ℓν indicating a lepton–neutrino pair, and j representing the quarks produced in the hard interaction) in a kinematic region defined by invariant mass $$m_\\mathrm {jj} >120\\,\\text {Ge}\\text {V} $$ mjj>120Ge and transverse momenta $$p_\\mathrm {T j} > 25\\,\\text {Ge}\\text {V} $$ pTj>25Ge. The cross section of the process is measured in the electron and muon channels yielding $$\\sigma _\\mathrm {EW}(\\mathrm{W} \\mathrm {jj})= 6.23 \\pm 0.12 \\,\\text {(stat)} \\pm 0.61 \\,\\text {(syst)} \\,\\text {pb} $$ σEW(Wjj)=6.23±0.12(stat)±0.61(syst)pb per channel, in agreement with leading-order standard model predictions. The additional hadronic activity of events in a signal-enriched region is studied, and the measurements are compared with predictions. The final state is also used to perform a search for anomalous trilinear gauge couplings. Limits on anomalous trilinear gauge couplings associated with dimension-six operators are given in the framework of an effective field theory. The corresponding 95% confidence level intervals are $$-2.3< c_{{\\mathrm{W} \\mathrm{W} \\mathrm{W}}}/\\varLambda ^2 < 2.5\\,\\text {Te}\\text {V} ^{-2}$$ -2.3
Journal Article
Erratum to: Search for a new scalar resonance decaying to a pair of Z bosons in proton-proton collisions at s = 13$$ \\sqrt{s}=13 $$TeV
2019
In both panels of figure 11, the unit of the z axis was mistakenly written as “pb” when it should have been “fb”. The corrected versions are shown in figure 1.
Journal Article
Search for supersymmetry in events with at least three electrons or muons, jets, and missing transverse momentum in proton-proton collisions at s = 13 $$ \\sqrt{s}=13 $$ TeV
by
Python, Q.
,
Rabady, D.
,
Jeitler, M.
in
Hadron-Hadron scattering (experiments)
,
Lepton production
,
Supersymmetry
2018
Abstract A search for new physics is carried out in events with at least three electrons or muons in any combination, jets, and missing transverse momentum. Results are based on the sample of proton-proton collision data produced by the LHC at a center-of-mass energy of 13 TeV and collected by the CMS experiment in 2016. The data sample analyzed corresponds to an integrated luminosity of 35.9 fb−1. Events are classified according to the number of b jets, missing transverse momentum, hadronic transverse momentum, and the invariant mass of same-flavor dilepton pairs with opposite charge. No significant excess above the expected standard model background is observed. Exclusion limits at 95% confidence level are computed for four different supersymmetric simplified models with pair production of gluinos or third-generation squarks. In the model with gluino pair production, with subsequent decays into a top quark-antiquark pair and a neutralino, gluinos with masses smaller than 1610 GeV are excluded for a massless lightest supersymmetric particle. In the case of bottom squark pair production, the bottom squark masses are excluded up to 840 GeV for charginos lighter than 200 GeV. For a simplified model of heavy top squark pair production, the t˜2 $$ {\\tilde{\\mathrm{t}}}_2 $$ mass is excluded up to 720, 780, or 710 GeV for models with an exclusive t˜2→t˜1H $$ {\\tilde{\\mathrm{t}}}_2\\to {\\tilde{\\mathrm{t}}}_1\\mathrm{H} $$ decay, an exclusive t˜2→t˜1Z $$ {\\tilde{\\mathrm{t}}}_2\\to {\\tilde{\\mathrm{t}}}_1\\mathrm{Z} $$ decay, or an equally probable mix of those two decays. In order to provide a simplified version of the analysis for easier interpretation, a small set of aggregate signal regions also has been defined, providing a compromise between simplicity and analysis sensitivity.
Journal Article
Constraints on the double-parton scattering cross section from same-sign W boson pair production in proton-proton collisions at s = 8$$ \\sqrt{s}=8 $$TeV
2018
Abstract A first search for same-sign WW production via double-parton scattering is performed based on proton-proton collision data at a center-of-mass energy of 8 TeV using dimuon and electron-muon final states. The search is based on the analysis of data corresponding to an integrated luminosity of 19.7 fb−1. No significant excess of events is observed above the expected single-parton scattering yields. A 95% confidence level upper limit of 0.32 pb is set on the inclusive cross section for same-sign WW production via the double-parton scattering process. This upper limit is used to place a 95% confidence level lower limit of 12.2 mb on the effective double-parton cross section parameter, closely related to the transverse distribution of partons in the proton. This limit on the effective cross section is consistent with previous measurements as well as with Monte Carlo event generator predictions.
Journal Article
Erratum 2: Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at s = 13 $$ \\sqrt{s}=13 $$ TeV
2018
In the original paper, figure 10 was incorrect. The correct figure is shown below. Additionally, the unparticle entries in table 3, as well as figure 4 and 5 were labelled with incorrect values of ΛU.
Journal Article
Search for low mass vector resonances decaying into quark-antiquark pairs in proton-proton collisions at s = 13$$ \\sqrt{s}=13 $$TeV
by
Python, Q.
,
Jeitler, M.
,
Starling, E.
in
Dark matter
,
Hadron-Hadron scattering (experiments)
,
Jet substructure
2018
Abstract A search for narrow vector resonances decaying into quark-antiquark pairs is presented. The analysis is based on data collected in proton-proton collisions at s=13 $$ \\sqrt{s}=13 $$ TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb−1. The hypothetical resonance is produced with sufficiently high transverse momentum that its decay products are merged into a single jet with two-prong substructure. A signal would be identified as a peak over a smoothly falling background in the distribution of the invariant mass of the jet, using novel jet substructure techniques. No evidence for such a resonance is observed within the mass range of 50-300 GeV. Upper limits at 95% confidence level are set on the production cross section, and presented in a mass-coupling parameter space. The limits further constrain simplified models of dark matter production involving a mediator interacting between quarks and dark matter particles through a vector or axial-vector current. In the framework of these models, the results are the most sensitive to date, extending for the first time the search region to masses below 100 GeV.
Journal Article
This website uses cookies to ensure you get the best experience on our website.