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High Energy Physics - Experiment

New submissions

[ total of 11 entries: 1-11 ]
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New submissions for Mon, 25 Sep 17

[1]  arXiv:1709.07497 [pdf, other]
Title: Evidence for the Higgs boson decay to a bottom quark-antiquark pair
Comments: Submitted to Phys. Lett. B. All figures and tables can be found at this http URL (CMS Public Pages)
Subjects: High Energy Physics - Experiment (hep-ex)

A search for the standard model (SM) Higgs boson ($\mathrm{H}$) decaying to $\mathrm{b}\overline{\mathrm{b}}$ when produced in association with an electroweak vector boson is reported for the following processes: $\mathrm{b}\overline{\mathrm{b}}(\nu\nu)\mathrm{H}$, $\mathrm{W}(\mu \nu)\mathrm{H}$, $\mathrm{W}(\mathrm{e} \nu)\mathrm{H}$, $\mathrm{Z}(\mu\mu)\mathrm{H}$, and $\mathrm{Z}(\mathrm{e}\mathrm{e})\mathrm{H}$. The search is performed in data samples corresponding to an integrated luminosity of 35.9 fb$^{-1}$ at $\sqrt{s}=$ 13 TeV recorded by the CMS experiment at the LHC during Run 2 in 2016. An excess of events is observed in data compared to the expectation in the absence of a $\mathrm{H} \to\mathrm{b}\overline{\mathrm{b}}$ signal. The significance of this excess is 3.3 standard deviations, where the expectation from SM Higgs boson production is 2.8. The signal strength corresponding to this excess, relative to that of the SM Higgs boson production, is 1.2$\pm$0.4. When combined with the Run 1 measurement of the same processes, the signal significance is 3.8 standard deviations with 3.8 expected. The corresponding signal strength, relative to that of the SM Higgs boson, is 1.06$^{+0.31}_{-0.29}$

[2]  arXiv:1709.07703 [pdf, other]
Title: $ZZ \to \ell^{+}\ell^{-}\ell^{\prime +}\ell^{\prime -}$ cross-section measurements and search for anomalous triple gauge couplings in 13 TeV $pp$ collisions with the ATLAS detector
Comments: 59 pages in total, author list starting page 37, 18 figures, 8 tables, submitted to Phys. Rev. D, All figures including auxiliary figures are available at this https URL
Subjects: High Energy Physics - Experiment (hep-ex)

Measurements of $ZZ$ production in the $\ell^{+}\ell^{-}\ell^{\prime +}\ell^{\prime -}$ channel in proton-proton collisions at 13 TeV center-of-mass energy at the Large Hadron Collider are presented. The data correspond to 36.1 $\mathrm{fb}^{-1}$ of collisions collected by the ATLAS experiment in 2015 and 2016. Here $\ell$ and $\ell'$ stand for electrons or muons. Integrated and differential $ZZ \to \ell^{+}\ell^{-}\ell^{\prime +}\ell^{\prime -}$ cross sections with $Z \to \ell^+\ell^-$ candidate masses in the range of 66 GeV to 116 GeV are measured in a fiducial phase space corresponding to the detector acceptance and corrected for detector effects. The differential cross sections are presented in bins of twenty observables, including several that describe the jet activity. The integrated cross section is also extrapolated to a total phase space and to all Standard-Model decays of $Z$ bosons with mass between 66 GeV and 116 GeV, resulting in a value of $17.3 \pm 0.9$ [$\pm 0.6$ (stat.) $\pm 0.5$ (syst.) $\pm 0.6$ (lumi.)] pb. The measurements are found to be in good agreement with the Standard-Model predictions. A search for neutral triple gauge couplings is performed using the transverse momentum distribution of the leading $Z$-boson candidate. No evidence for such couplings is found and exclusion limits are set on their parameters.

Cross-lists for Mon, 25 Sep 17

[3]  arXiv:1709.07852 (cross-list from hep-ph) [pdf, other]
Title: Spin Precession Experiments for Light Axionic Dark Matter
Comments: 18 pages, 4 figures
Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Experiment (hep-ex); Atomic Physics (physics.atom-ph)

Axion-like particles are promising candidates to make up the dark matter of the universe, but it is challenging to design experiments that can detect them over their entire allowed mass range. Dark matter in general, and in particular axion-like particles and hidden photons, can be as light as roughly $10^{-22} \;\rm{eV}$ ($\sim 10^{-8} \;\rm{Hz}$), with astrophysical anomalies providing motivation for the lightest masses ("fuzzy dark matter"). We propose experimental techniques for direct detection of axion-like dark matter in the mass range from roughly $10^{-13} \;\rm{eV}$ ($\sim 10^2 \;\rm{Hz}$) down to the lowest possible masses. In this range, these axion-like particles act as a time-oscillating magnetic field coupling only to spin, inducing effects such as a time-oscillating torque and periodic variations in the spin-precession frequency with the frequency and direction set by fundamental physics. We show how these signals can be measured using existing experimental technology, including torsion pendulums, atomic magnetometers, and atom interferometry. These experiments demonstrate a strong discovery capability, with future iterations of these experiments capable of pushing several orders of magnitude past current astrophysical bounds.

Replacements for Mon, 25 Sep 17

[4]  arXiv:1701.01345 (replaced) [pdf, other]
Title: Search for leptophobic Z' bosons decaying into four-lepton final states in proton-proton collisions at sqrt(s) = 8 TeV
Comments: Replaced with the published version. Added the journal reference and DOI. All the figures and tables can be found at this http URL (CMS Public Pages)
Journal-ref: Phys. Lett. B 773 (2017) 563
Subjects: High Energy Physics - Experiment (hep-ex)
[5]  arXiv:1702.02859 (replaced) [pdf, other]
Title: Fiducial, total and differential cross-section measurements of $t$-channel single top-quark production in $pp$ collisions at 8 TeV using data collected by the ATLAS detector
Comments: 70 pages in total, author list starting on page 54, 22 figures, 21 tables, submitted to Eur. Phys. J. C. All figures including auxiliary figures are available at this http URL This version matches publication
Journal-ref: Eur. Phys. J. C 77 (2017) 531
Subjects: High Energy Physics - Experiment (hep-ex)
[6]  arXiv:1703.07785 (replaced) [pdf, other]
Title: Gravitational Wave Oscillations in Bigravity
Comments: 6 pages, 3 figures, journal version
Journal-ref: Phys. Rev. Lett. 119, 111101 (2017)
Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Experiment (hep-ex); High Energy Physics - Phenomenology (hep-ph)
[7]  arXiv:1706.00428 (replaced) [pdf, other]
Title: Parton distributions from high-precision collider data
Comments: Revised version, to be publ.in EPJC. Typos corrected and points clarified. Figs 2.4, 4.21, 4.30 and 4.31 added. PDF comparison plots added. Fit with nuclear corrections added in Sect 4.11. Labeling of all distance plots corrected (u and d were interchanged). Points in charm cross-sections without cuts added to Tab 3.2
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
[8]  arXiv:1706.05707 (replaced) [pdf, ps, other]
Title: Analytic parametrizations of the $γ^\ast N \to N(1440)$ form factors inspired by Light-Front holography
Authors: G. Ramalho
Comments: 7 pages, 4 figures. Extended version. Accepted for publication
Journal-ref: Phys. Rev. D 96, 054021 (2017)
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
[9]  arXiv:1706.08679 (replaced) [pdf, other]
Title: Thermalization in small system of hadron gas and high-multiplicity pp events
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex); Nuclear Theory (nucl-th)
[10]  arXiv:1707.05263 (replaced) [pdf, other]
Title: Identifying the nature of dark matter at $e^{-}e^{+}$ Colliders
Authors: Nabil Baouche (1), Amine Ahriche (2) ((1) Ecole Normale Superieure, Algiers & U. Medea, (2) U. Jijel & ICTP, Trieste)
Comments: 15 pages, 10 figures, 7 tables & matches the published version
Journal-ref: Phys. Rev. D 96, 055029 (2017)
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
[11]  arXiv:1707.08004 (replaced) [pdf, other]
Title: Cryogenic readout for multiple VUV4 Multi-Pixel Photon Counters in liquid xenon
Comments: 17 pages, 12 figures
Subjects: Instrumentation and Detectors (physics.ins-det); High Energy Physics - Experiment (hep-ex)
[ total of 11 entries: 1-11 ]
[ showing up to 2000 entries per page: fewer | more ]

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