Preprints

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2017-10-20
12:14
OpenAccess [PUBDB-2017-11466] Preprint/Report
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Femtosecond x-ray diffraction from an aerosolized beam of protein nanocrystals
[arXiv:1702.04014] ddc:530
We demonstrate near-atomic-resolution Bragg diffraction from aerosolized single granulovirus crystals using an x-ray free-electron laser. The form of the aerosol injector is nearly identical to conventional liquid-microjet nozzles, but the x-ray-scattering background is reduced by several orders of magnitude by the use of helium carrier gas rather than liquid. [...]
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2017-10-16
10:41
OpenAccess [PUBDB-2017-11400] Preprint/Report
; ; ; et al
The Three Loop Two-Mass Contribution to the Gluon Vacuum Polarization
[DESY-17-157; DO-TH-17-26; arXiv:1710.04500]

 GO
We calculate the two-mass contribution to the 3-loop vacuum polarization of the gluon in Quantum Chromodynamics at virtuality $p^2 = 0$ for general masses and also present the analogous result for the photon in Quantum Electrodynamics..
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2017-10-06
15:33
[PUBDB-2017-11208] Preprint
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Fuchsia : A tool for reducing differential equations for Feynman master integrals to epsilon form
ddc:004
We present Fuchsia — an implementation of the Lee algorithm, which for a given system of ordinary differential equations with rational coefficients $∂_xJ(x,ε)=\mathbb{A}(x,ε)J(x,ε)$ finds a basis transformation $\mathbb{T}(x,ε),i.e., J(x,ε)= \mathbb{T}(x,ε)J′(x,ε)$, such that the system turns into the epsilon form: $∂_x J′(x,ε)=ε \mathbb{S}(x)J′(x,ε)$, where $\mathbb{S}(x)$, where is a Fuchsian matrix. A system of this form can be trivially solved in terms of polylogarithms as a Laurent series in the dimensional regulator [...]
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2017-09-28
07:45
arXiv [PUBDB-2017-11062] Preprint/Report
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$t\bar{t}b\bar{b}$ hadroproduction with massive bottom quarks with PowHel
[DESY-17-138; arXiv:1709.06915]

The associated production of top-antitop-bottom-antibottom quarks is a relevant irreducible background for Higgs boson analyses in the top-antitop-Higgs production channel, with Higgs decaying into a bottom-antibottom quark pair. We implement this process in the PowHel event generator, considering the bottom quarks as massive in all steps of the computation which involves hard-scattering matrix-elements in the 4-flavour number scheme combined with 4-flavour Parton Distribution Functions. [...]
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2017-09-27
11:10
OpenAccess [PUBDB-2017-11056] Preprint/Report
; ; ; et al
Search for higgsino pair production in pp collisions at $\sqrt{s}$ = 13 TeV in final states with large missing transverse momentum and two Higgs bosons decaying via $\mathrm{H} \to\mathrm{b}\overline{\mathrm{b}}$
[CMS-SUS-16-044; CERN-EP-2017-127; arXiv:1709.04896]

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Results are reported from a search for new physics in 13 TeV proton-proton collisions in the final state with large missing transverse momentum and two Higgs bosons decaying via $\mathrm{H} \to\mathrm{b}\overline{\mathrm{b}}$. The search uses a data sample accumulated by the CMS experiment at the LHC in 2016, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. [...]
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2017-09-27
11:06
OpenAccess [PUBDB-2017-11055] Preprint/Report
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Challenges to the chiral magnetic wave using charge-dependent azimuthal anisotropies in pPb and PbPb collisions at $\sqrt{\smash[b]{s_{_{\mathrm{NN}}}}} = $ 5.02 TeV
[CMS-HIN-16-0017; CERN-EP-2017-180; arXiv:1708.08901]

 GO
Charge-dependent anisotropy Fourier coefficients ($v_n$) of particle azimuthal distributions are measured in pPb and PbPb collisions at $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}} = $ 5.02 TeV with the CMS detector at the LHC. The normalized difference in the second-order anisotropy coefficients ($v_2$) between positively and negatively charged particles is found to depend linearly on the observed event charge asymmetry with comparable slopes for both pPb and PbPb collisions over a wide range of charged particle multiplicity. [...]
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2017-09-27
11:03
OpenAccess [PUBDB-2017-11054] Preprint/Report
; ; ; et al
Measurement of the splitting function in pp and PbPb collisions at $\sqrt{s_{_{\mathrm{NN}}}}=$ 5.02 TeV
[CMS-HIN-16-006; CERN-EP-2017-205; arXiv:1708.09429]

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Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions. However, the stage in the shower evolution at which the modifications occur is not known. [...]
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2017-09-27
11:00
OpenAccess [PUBDB-2017-11053] Preprint/Report
; ; ; et al
Search for supersymmetry with Higgs boson to diphoton decays using the razor variables at $\sqrt{s}=$ 13 TeV
[CMS-SUS-16-045; CERN-EP-2017-158; arXiv:1709.00384]

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An inclusive search for anomalous Higgs boson production in the diphoton decay channel and in association with at least one jet is presented, using LHC proton-proton collision data collected by the CMS experiment at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The razor variables $M_\mathrm{R}$ and $\mathrm{R}^2$, as well as the momentum and mass resolution of the diphoton system, are used to categorize events into different search regions. [...]
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2017-09-27
10:57
OpenAccess [PUBDB-2017-11052] Preprint/Report
; ; ; et al
Combination of inclusive and differential $\mathrm{t}\bar{\mathrm{t}}$ charge asymmetry measurements using ATLAS and CMS data at $\sqrt{s} =$ 7 and 8 TeV
[CMS-TOP-15-016; ATLAS-TOPQ-2016-16; CERN-EP-2017-236; arXiv:1709.05327]

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This paper presents combinations of inclusive and differential measurements of the charge asymmetry ($A_{\mathrm{C}}$) in top quark pair ($\mathrm{t}\overline{\mathrm{t}}$) events with a lepton+jets signature by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at centre-of-mass energies of 7 and 8 TeV corresponding to integrated luminosities of about 5 and 20 fb$^{-1}$ for each experiment, respectively. The resulting combined LHC measurements of the inclusive charge asymmetry are $A_{\mathrm{C}}^{\mathrm{LHC7}} = 0.005 \pm0.007 \text{ (stat)}\pm0.006 \text{ (syst)}$ at 7 TeV and $A_{\mathrm{C}}^{\mathrm{LHC8}} = 0.0055 \pm0.0023\text{ (stat)}\pm0.0025\text{ (syst)}$ at 8 TeV. [...]
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2017-09-27
10:53
OpenAccess [PUBDB-2017-11051] Preprint/Report
; ; ; et al
Search for electroweak production of charginos and neutralinos in multilepton final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV
[CMS-SUS-16-039; CERN-EP-2017-121; arXiv:1709.05406]

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Results are presented from a search for the direct electroweak production of charginos and neutralinos in signatures with either two or more leptons (electrons or muons) of the same electric charge, or with three or more leptons, which can include up to two hadronically decaying tau leptons. The results are based on a sample of proton-proton collision data collected at $\sqrt{s}=$ 13 TeV, recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. [...]
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