Showing papers by "Tulin Varol published in 2018"
TL;DR: In this article, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations and the observed (expected) significance is 6.3 (5.1) standard deviations.
306 citations
TL;DR: In this paper, the properties of the Higgs boson were measured in the two-photon final state using 36.1 fb-1 of proton? proton collision data recorded at ffiffi √s = 13 TeV by the ATLAS experiment at the Large Hadron Collider.
Abstract: Properties of the Higgs boson are measured in the two-photon final state using 36.1 fb-1 of proton? proton collision data recorded at ffiffi √s = 13 TeV by the ATLAS experiment at the Large Hadron Collider. Cross-section measurements for the production of a Higgs boson through gluon-gluon fusion, vectorboson fusion, and in association with a vector boson or a top-quark pair are reported. The signal strength, defined as the ratio of the observed to the expected signal yield, is measured for each of these production processes as well as inclusively. The global signal strength measurement of 0.99 ± 0.14 improves on the precision of the ATLAS measurement at √s = 7 and 8 TeV by a factor of two. Measurements of gluon-gluon fusion and vector-boson fusion productions yield signal strengths compatible with the Standard Model prediction. Measurements of simplified template cross sections, designed to quantify the different Higgs boson production processes in specific regions of phase space, are reported. The cross section for the production of the Higgs boson decaying to two isolated photons in a fiducial region closely matching the experimental selection of the photons is measured to be 55 ± 10 fb, which is in good agreement with the Standard Model prediction of 64 ± 2 fb. Furthermore, cross sections in fiducial regions enriched in Higgs boson production in vector-boson fusion or in association with large missing transverse momentum, leptons or top-quark pairs are reported. Differential and double-differential measurements are performed for several variables related to the diphoton kinematics as well as the kinematics and multiplicity of the jets produced in association with a Higgs boson. These differential cross sections are sensitive to higher order QCD corrections and properties of the Higgs boson, such as its spin and CP quantum numbers. No significant deviations from a wide array of Standard Model predictions are observed. Finally, the strength and tensor structure of the Higgs boson interactions are investigated using an effective Lagrangian, which introduces additional CP-even and CP-odd interactions. No significant new physics contributions are observed.
251 citations
TL;DR: A search for the decay of the Standard Model Higgs boson into a bb¯ pair when produced in association with a W or Z boson is performed with the ATLAS detector as mentioned in this paper.
221 citations
TL;DR: In this article, a search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decaying Z boson in proton-proton collisions at s = 13 TeV is presented.
115 citations
TL;DR: In this article, a search for the standard model Higgs boson produced in association with a top-quark pair, t(t)overbarH, is presented using 36.1 fb(-1) of pp collision data at root s = 13 TeV collecte...
Abstract: A search for the standard model Higgs boson produced in association with a top-quark pair, t(t)overbarH, is presented. The analysis uses 36.1 fb(-1) of pp collision data at root s = 13 TeV collecte ...
108 citations
TL;DR: In this article, a search for a heavy neutral Higgs boson decaying into a Z boson and another heavy Higgs Boson, H, was performed using a data sample corresponding to an integrated luminosity of 36.1 fb(-1) from...
104 citations
TL;DR: In this paper, a neural network was used to improve the background rejection and extract the signal of top quark production in the collision data collected by the ATLAS experiment at the LHC in 2015 and 2016.
54 citations
TL;DR: In this article, the exclusive decays of the Higgs and Z bosons into a J/ψ, ψ(2S), or ϒ(nS) ( n=1,2,3 ) meson and a photon are performed with a pp collision data sample corresponding to an integrated luminosity of 361fb−1 collected at s=13TeV with the ATLAS detector at the CERN Large Hadron Collider.
51 citations
TL;DR: In this paper, a search for pair production of the supersymmetric partners of the Higgs boson (higgsinos H˜) in gauge-mediated scenarios is reported.
Abstract: A search for pair production of the supersymmetric partners of the Higgs boson (higgsinos H˜) in gauge-mediated scenarios is reported Each higgsino is assumed to decay to a Higgs boson and a gravitino Two complementary analyses, targeting high- and low-mass signals, are performed to maximize sensitivity The two analyses utilize LHC pp collision data at a center-of-mass energy s=13 TeV, the former with an integrated luminosity of 361 fb-1 and the latter with 243 fb-1, collected with the ATLAS detector in 2015 and 2016 The search is performed in events containing missing transverse momentum and several energetic jets, at least three of which must be identified as b-quark jets No significant excess is found above the predicted background Limits on the cross section are set as a function of the mass of the H˜ in simplified models assuming production via mass-degenerate higgsinos decaying to a Higgs boson and a gravitino Higgsinos with masses between 130 and 230 GeV and between 290 and 880 GeV are excluded at the 95% confidence level Interpretations of the limits in terms of the branching ratio of the higgsino to a Z boson or a Higgs boson are also presented, and a 45% branching ratio to a Higgs boson is excluded for mH˜≈400 GeV
50 citations
TL;DR: In this article, a combined measurement of differential and inclusive total cross sections of Higgs boson production is performed using 36.1 fb −1 of 13 TeV proton-proton collision data produced by the LHC and recorded by the ATLAS detector in 2015 and 2016.
44 citations
TL;DR: In this paper, a search for the direct pair production of the stop, the supersymmetric partner of the top quark, was presented for the R-parity-violating coupling to a final state with two leptons.
Abstract: A search is presented for the direct pair production of the stop, the supersymmetric partner of the top quark, that decays through an R-parity-violating coupling to a final state with two leptons a ...
TL;DR: In this paper, the dynamics of isolated-photon production in association with a jet in proton-proton collisions at a centre-of-mass energy of 13 TeV were studied with the ATLAS detector at the LHC using a dataset with an integrated luminosity of 3.2 fb −1.
TL;DR: In this paper, a measurement of the fragmentation functions of jets into charged particles in $p$+Pb collisions and $pp$ collisions is presented, using 28 nb$^{-1}$ and 26 pb$€-1$ of $pp€ data, both at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV, collected in 2013 and 2015 with the ATLAS detector at the LHC.
TL;DR: In this paper, a measurement of the production of three isolated photons in proton-proton collisions at a centre-of-mass energy s=8 TeV is reported, based on an integrated luminosity of 20.2 fb −1 collected with the ATLAS detector at the LHC.
TL;DR: In this paper, the results of a search for gluino pair production with subsequent R-parity-violating decays to quarks are presented using 36.1 fb(-1) of data collected by the ATLAS detector in proton-protector networks.
TL;DR: In this article, the measurement of differential cross sections of isolated prompt photons produced in association with a b-jet or a c-jet was presented, which provided sensitivity to the heavy-f...
TL;DR: In this paper, a search for heavy resonances decaying into a Higgs boson and a new particle (X) was reported, utilizing 36.1 fb(-1) of proton-proton collision data at root s = 13 TeV collected during 2015 and 2016.