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2018-11-21
11:47
OpenAccess [PUBDB-2018-04669] Conference Presentation
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Search for contact interactions in inclusive ep scattering at HERA
39th International Conference on High Energy Physics, ICHEP2018, SeoulSeoul, Republic of Korea, 4 Jul 2018 - 11 Jul 20182018-07-042018-07-11  GO
The high-precision HERA data are used to search for Beyondthe Standard Model contributions to electron-quark scatteringin the framework of eeqq contact interactions (CI). Combined measurementsof the inclusive deep inelastic cross sections in neutral and chargedcurrent ep scattering are considered, corresponding to a luminosityof around 1 fb−1 [...]
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2018-11-21
11:37
OpenAccess [PUBDB-2018-04667] Conference Presentation
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Combination and QCD analysis of beauty and charm production cross section measurements in deep inelastic ep scattering at HERA
39th International Conference on High Energy Physics, ICHEP2018, SeoulSeoul, Republic of Korea, 4 Jul 2018 - 11 Jul 20182018-07-042018-07-11  GO
Measurements of open charm and beauty production cross sections in deep inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections are obtained in the kinematic range of negative four-momentum transfer squared of the photon 2.5 GeV2≤Q2≤2000 GeV2 and Bjorken scaling variable 3⋅10−5≤xBj≤5⋅10−2. [...]
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2018-11-21
11:26
OpenAccess [PUBDB-2018-04666] Journal Article/Contribution to a conference proceedings
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NNLO QCD predictions for dijet production in diffractive DIS
XXVI International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2018, KobeKobe, Japan, 16 Apr 2018 - 20 Apr 20182018-04-162018-04-20 Proceedings of Science / International School for Advanced Studies (DIS2018), 059 () [10.3204/PUBDB-2018-04666]  GO
The cross sections fo the dijet production in diffractive deep-inelastic scattering are calculated for the first time in next-to-next-to-leading accuracy.The next-to-next-to-leading order corrections are found to be positive and sizable.The cross sections are compared to a considerable number of HERA measurements performed by H1 and ZEUS collaborations. We observe an overall good agreement of the next-to-leading order calculation with data, whereas the next-to-next-to-leading calculations tend to overestimate the data, probably due to poorly constrained gluon component of the diffractive parton distribution functions..
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2018-11-21
11:19
OpenAccess [PUBDB-2018-04665] Conference Presentation
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Diffractive dijet production in DIS compared to NNLO QCD predicitons
XXVI International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2018, KobeKobe, Japan, 16 Apr 2018 - 20 Apr 20182018-04-162018-04-20 () [10.3204/PUBDB-2018-04665]  GO
Calculations for dijet production in diffractive deep-inelastic scattering (DIS) at next-to-next-to-leading order accuracy (NNLO) are presented. The calculations are based on the antenna subtraction formalism and the hard coefficients are convoluted with currently available PDFs for diffractive scattering (DPDFs).The NNLO predictions are compared to a large number of available measurements and different observables. [...]
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ddc:530
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2018-11-21
10:54
OpenAccess [PUBDB-2018-04664] Conference Presentation
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QCD analysis of the ATLAS and CMS W$\pm$ and Z cross-section measurements and implications for the strange sea density
XXVI International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2018, KobeKobe, Japan, 16 Apr 2018 - 20 Apr 20182018-04-162018-04-20 () [10.3204/PUBDB-2018-04664]  GO
In the present paper, the ATLAS inclusive W± and Z boson production data are analysed together with the CMS inclusive W± and Z boson production data to investigate any possible tensions between the data sets and to determine the strange sea fraction, within the framework of a parton distribution function fit at next-to next-to leading order in perturbative QCD..
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ddc:530
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2018-11-21
10:45
OpenAccess [PUBDB-2018-04663] Conference Presentation
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MC tuning with low-x low-Q$^2$ higher twists HHT PDF from HERA
XXVI International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2018, KobeKobe, Japan, 16 Apr 2018 - 20 Apr 20182018-04-162018-04-20 () [10.3204/PUBDB-2018-04663]  GO
In the HHT QCD fit the standard DGLAP evolution was augmented by including an additional low-x higher-twist term in the description of the longitudinal structure function, FL. This additional term significantly improves the description of the HERA reduced cross sections at low Bjorken-x and low four-momentum-transfer squared, Q$^2$ [...]
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2018-11-21
09:47
OpenAccess [PUBDB-2018-04661] Conference Presentation
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Further studies of isolated photon production with a jet in deep inelastic scattering at HERA
XXVI International Workshop on Deep Inelastic Scattering and Related Subjects, DIS 2018, KobeKobe, J, 16 Apr 2018 - 20 Apr 20182018-04-162018-04-20  GO
Isolated photons with high transverse energy have been studied in deep inelastic ep scattering with the ZEUS detector at HERA, using an integrated luminosity of 326pb−1 in the range of exchanged-photon virtuality 10−350GeV2. Outgoing isolated photons with transverse energy 4<EγT<15 GeV and pseudorapidity −0.7<ηγ<0.9 were measured with accompanyingjets having transverse energy and pseudorapidity 2.5<EjetT<35 GeV and −1.5<ηjet<1.8, respectively. [...]
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2018-11-21
09:26
OpenAccess [PUBDB-2018-04660] Conference Presentation

Combination and QCD analysis of beauty and charm production cross sections in DIS at HERA
XXVI International Workshop on Deep Inelastic Scattering and Related Subjects, DIS2018, KobeKobe, Japan, 16 Apr 2018 - 20 Apr 20182018-04-162018-04-20  GO
Measurements of open beauty and charm production cross sections in deep inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections for beauty and charm production are obtained in the kinematic range of photon virtuality 2.5≤Q2≤2000 GeV2 and Bjorken scaling variable 3×10−5≤xBj≤5×10−2. [...]
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2018-11-20
17:03
OpenAccess [PUBDB-2018-04659] Contribution to a conference proceedings
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Beam Quality Limitations of Plasma-Based Accelerators
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 Jacow 5 pp. () [10.3204/PUBDB-2018-04659]  GO
Plasma-based accelerators are a promising novel technology that could signiĄcantly reduce the size and cost of future accelerator facilities. However, the typical quality and stabil-ity of the produced beams is still inferior to the requirements of Free Electron Lasers (FELs) and other applications. [...]
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2018-11-20
17:00
OpenAccess [PUBDB-2018-04658] Preprint/Report
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Measurements of differential cross sections of top quark pair production in association with jets in ${pp}$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector
[arXiv:1802.06572; CERN-EP-2017-227; CERN-EP-2017-227]
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Measurements of differential cross sections of top quark pair production in association with jets by the ATLAS experiment at the LHC are presented. The measurements are performed as functions of the top quark transverse momentum, the transverse momentum of the top quark-antitop quark system and the out-of-plane transverse momentum using data from pp collisions at $ \sqrt{s}=13 $ TeV collected by the ATLAS detector at the LHC in 2015 and corresponding to an integrated luminosity of 3.2 fb$^{−1}$. [...]
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