OpenAccess

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2022-12-09
14:16
OpenAccess [PUBDB-2022-07464] Preprint
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Precision luminosity measurement with proton-proton collisions at the CMS experiment in Run 2
[arXiv:2208.08214]
A precision luminosity measurement is essential for LHC cross-section measurements to determine fundamental parameters of the standard model and constrain or discover beyond-the-standard-model phenomena. The luminosity of the CMS detector has been measured at the LHC Interaction Point~5 using proton-proton collisions at $\sqrt{s}=13$ TeV during the Run 2 data-taking period (2015-2018). [...]
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2022-12-09
14:01
OpenAccess [PUBDB-2022-07460] Preprint
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Search for central exclusive production of top quark pairs with the CMS and TOTEM experiments
[CMS-CR-2022-182; CMS-CR-2022-183; arXiv:2210.13884]
A search for central exclusive production of top quark pairs ($\mathrm{t}\bar{\mathrm{t}}$) is presented using collision data collected by CMS and the CMS-TOTEM Precision Proton Spectrometer in 2017. A data-driven method to estimate the background from coincidences of inclusive events and pileup protons is described, as well as the development of a Boosted Decision Tree classifier to separate the exclusive $\mathrm{t}\bar{\mathrm{t}}$ signal from the inclusive $\mathrm{t}\bar{\mathrm{t}}$ background. [...]
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2022-12-09
13:54
OpenAccess [PUBDB-2022-07458] Preprint
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Probing the Weak Mixing Angle at high energies at the LHC
[arXiv:2211.08967]
The electroweak mixing angle is a fundamental parameter of the theory of electroweak interactions. Its value has been measured precisely at the $\mathrm{Z}$-pole at colliders. [...]
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2022-12-09
13:41
OpenAccess [PUBDB-2022-07457] Preprint
; ; ; et al
Single-differential top quark pair production cross sections with running mass schemes at NLO
[arXiv:2211.13607]
Single-differential cross section predictions for top quark pair production are presented at next-to-leading order, using running top quark mass renormalization schemes. The evolution of the mass of the top quark is performed in the MSR scheme $m_\mathrm{t}^{\textrm{MSR}}(\mu)$ for renormalization scales $\mu$ below the $\overline{\textrm{MS}}$ top quark mass $\overline{m}_\mathrm{t}(\overline{m}_\mathrm{t})$, and in the $\overline{\textrm{MS}}$ scheme $\overline{m}_\mathrm{t}(\mu)$ for scales above. [...]
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2022-12-09
13:36
OpenAccess [PUBDB-2022-07456] Report
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First results of the high resolution wire scanners for beam profile and absolute beam position measurement at the TTF
[DESY-TESLA-FEL-2000-05O]
7 pp. () [10.3204/PUBDB-2022-07456]  GO
In the TESLA Test Facility, wire scanners are used to measure the electron beam profile and position. The intended use of the wire scanners (to center the electron beam in the Free Electron Laser undulator) requires an especially precise alignment of the wire scanners with respect to the undulator axis. [...]
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2022-12-09
13:32
OpenAccess [PUBDB-2022-07455] Preprint
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Measurement of the top quark pole mass using $\text{t}\overline{\text{t}}$+jet events in the dilepton final state at $\sqrt{s}=13$ TeV
[arXiv:2207.13413]
In these proceedings, a measurement of the differential cross section of top quark-antiquark pair ($\text{t}\overline{\text{t}}$) production in association with one additional jet ($\text{t}\overline{\text{t}}$+jet) as a function of the inverse of the invariant mass of the $\text{t}\overline{\text{t}}$+jet system, $\rho=340\,\text{GeV}/m_{\text{t}\overline{\text{t}}+\text{jet}}$, is presented. The normalized $\text{t}\overline{\text{t}}$+jet cross section is used to extract values for the top quark pole mass $m_{\text{t}}^{\text{pole}}$ by a comparison to theoretical predictions at next-to-leading order accuracy. [...]
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2022-12-09
13:20
OpenAccess [PUBDB-2022-07453] Report
; ; ; et al
Photon diagnostics for the study of electron beam properties of a VUV SASE FEL
[DESY-TESLA-FEL-2000-05E]
9 pp. () [10.3204/PUBDB-2022-07453]  GO
A single-pass free-electron laser operating in the self-amplified spontaneous-emission (SASE) mode at around 100 nm is currently under test at the TESLA Test Facility at DESY. After first observation of SASE in February 2000, the photon beam has been characterized by different techniques. [...]
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2022-12-09
13:20
OpenAccess [PUBDB-2022-07452] Journal Article/Contribution to a conference proceedings
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CMS Tracker Alignment activities during LHC Long Shutdown 2
41st International Conference on High Energy Physics, ICHEP2022, BolognaBologna, Italy, 6 Jul 2022 - 13 Jul 20222022-07-062022-07-13 Proceedings of Science / International School for Advanced Studies (ICHEP2022), 633 () [10.22323/1.414.0633]  GO
The strategies for and the performance of the CMS tracker alignment during the 2021-2022 LHC commissioning preceding the Run 3 data-taking period are described. The results of the very first tracker alignment after the pixel reinstallation, performed with cosmic ray muons recorded with the solenoid magnet off are presented. [...]
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2022-12-09
13:17
OpenAccess [PUBDB-2022-07451] Journal Article/Contribution to a conference proceedings/Contribution to a book
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Precision luminosity measurement with proton-proton collisions at the CMS experiment in Run 2
[arXiv:2208.08214]
41st International Conference on High Energy Physics, ICHEP2022, BolognaBologna, Italy, 6 Jul 2022 - 13 Jul 20222022-07-062022-07-13 Proceedings of Science / International School for Advanced Studies (ICHEP2022), 638 () [10.22323/1.414.0638]  GO
A precision luminosity measurement is essential for LHC cross-section measurements to determine fundamental parameters of the standard model and constrain or discover beyond-the-standard-model phenomena.The luminosity of the CMS detector has been measured at the LHC Interaction Point~5 using proton-proton collisions at s√=13 TeV during the Run 2 data-taking period (2015-2018). The absolute luminosity scale is obtained using beam-separation scans and the Van der Meer (VdM) method, and several systematic uncertainty sources are investigated, from the knowledge of the scale of beam separation provided by LHC magnets to the nonfactorizability of the spatial components of proton bunch density distributions in the transverse direction. [...]
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2022-12-09
13:14
OpenAccess [PUBDB-2022-07449] Report
; ; ; et al
Development of a pump-probe facility combining a far-infrared source with laser-like characteristics and a VUV free electron laser
[DESY-TESLA-FEL-2000-05B]
7 pp. () [10.3204/PUBDB-2022-07449]  GO
The TESLA Test Facility (TTF) at DESY is a facility producing sub-picosecond electron pulses for the generation of VUV or soft X-ray radiation in a free electron laser (FEL). The same electron pulses would also allow the direct production of high-power coherent radiation by passing the electron beam through an undulator. [...]
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