CERN Accelerating science

CERN Preprints

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2020-07-09
14:01
First observation of the decay $B^0 \rightarrow D^0 \overline{D}{}^0 K^+ \pi^-$
The first observation of the decay $B^0 \rightarrow D^0 \overline{D}{}^0 K^+ \pi^-$ is reported using proton-proton collision data corresponding to an integrated luminosity of 4.7 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in 2011, 2012 and 2016. [...]
CERN-EP-2020-112 ; arXiv:2007.04280 ; LHCB-PAPER-2020-015.
- 2020.
Fulltext - Related data file(s)

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2020-07-09
12:11
The CMS Tracker Upgrade for the High Luminosity LHC / Paoletti, Simone (INFN, Florence) /CMS Collaboration
The LHC machine is planning an upgrade program which will smoothly bring the instantaneous luminosity to about $\mathrm{5 - 7.5 \times 10^{34} cm^{-2}s^{-1}}$ in 2028, to reach an integrated luminosity of $\mathrm{3000 \ fb ^{-1}}$ and possibly up to $\mathrm{4500 \ fb ^{-1}}$ by the end of 2039. This High Luminosity LHC scenario, HL-LHC, will require an upgrade program of the LHC detectors known as Phase-2 upgrade. [...]
CMS-CR-2019-253.- Geneva : CERN, 2019 - 8 p. Fulltext: PDF;
In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019

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2020-07-09
12:11
Development of an Optical Readout Hybrid for the CMS Outer Tracker Upgrade / Rasevic, Nikola (VINCA Inst. Nucl. Sci., Belgrade) ; Blanchot, Georges (CERN) ; Baron, S ; Kovacs, Mark Istvan (CERN) ; Kulis, S ; Porret, D ; Zografos, Angelos (Natl. Tech. U., Athens)
The pixel-strip modules for the CMS Tracker Phase-2 Upgrade for the HL-LHC integrate a readout hybrid (PS-ROH) for the control and data acquisition link. This hybrid is based on the new, low power and compact gigabit transceiver (LpGBT) and the versatile transceiver VTRx+ specifically designed for the upgrade. [...]
CMS-CR-2019-222.- Geneva : CERN, 2019 - 6 p. Fulltext: PDF;
In : TWEPP 2019 Topical Workshop on Electronics for Particle Physics, Santiago De Compostela, Spain, 2 - 6 Sep 2019

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2020-07-09
11:49
Investigation into the event-activity dependence of $\Upsilon(\text{nS})$ relative production in proton-proton collisions at $\sqrt{s} = $ 7 TeV
The ratios of the production cross sections between the excited $\Upsilon\text{(2S)}$ and $\Upsilon\text{(3S)}$ mesons and the $\Upsilon\text{(1S)}$ ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. [...]
CERN-EP-2020-075 ; CMS-BPH-14-009-003.
- 2020.
Additional information for the analysis - CMS AuthorList - Fulltext

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2020-07-09
04:47
Constraining Early Dark Energy with Large-Scale Structure / Ivanov, Mikhail M. (New York U., CCPP ; Moscow, INR) ; McDonough, Evan (MIT, Cambridge, CTP) ; Hill, J. Colin (Columbia U. ; Flatiron Inst., New York) ; Simonović, Marko (CERN) ; Toomey, Michael W. (Brown U.) ; Alexander, Stephon (Brown U.) ; Zaldarriaga, Matias (Princeton, Inst. Advanced Study)
An axion-like field comprising $\sim 10\%$ of the energy density of the universe near matter-radiation equality is a candidate to resolve the Hubble tension; this is the "early dark energy" (EDE) model. [...]
arXiv:2006.11235 ; INR-TH-2020-035; CERN-TH-2020-103.
- 26 p.
Fulltext

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2020-07-09
04:45
Finding Wombling Boundaries in LHC Data with Voronoi and Delaunay Tessellations / Matchev, Konstantin T. (Florida U., Inst. Fund. Theor.) ; Roman, Alexander (Florida U., Inst. Fund. Theor.) ; Shyamsundar, Prasanth (Florida U., Inst. Fund. Theor.)
We address the problem of finding a wombling boundary in point data generated by a general Poisson point process, a specific example of which is an LHC event sample distributed in the phase space of a final state signature, with the wombling boundary created by some new physics. [...]
arXiv:2006.06582.
- 49 p.
Fulltext

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2020-07-09
04:45
Beam-Gas Interactions / Ferro-Luzzi, M. (CERN)
An overview of beam-gas interactions in particle accelerators is presented. [...]
arXiv:2006.06490.
- 20 p.
Fulltext

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2020-07-08
13:35
Proceedings of the 2018 course on Numerical Methods for Analysis, Design and Modelling of Particle Accelerators, Thessaloniki, Greece, 11–23 November 2018 / Schmickler, Hermann (CERN)
The CAS course on "Numerical Methods for Analysis, Design and Modelling of Particle Accelerators" is part of the so called topical CAS courses, which are intended to give during two weeks a deep understanding of simulation and modelling tools used for the design, construction and operation of accelerators. [...]
CERN-ACC-2020-0012.
- 2020. - 322 p.
Full text

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2020-07-08
05:08
Relativistic nuclear collisions: Establishing the non-critical baseline for fluctuation measurements / Braun-Munzinger, Peter ; Friman, Bengt ; Redlich, Krzysztof ; Rustamov, Anar ; Stachel, Johanna
We study the influence of global baryon number conservation on the non-critical baseline of net baryon cumulants in heavy-ion collisions in a given acceptance, accounting for the asymmetry between the mean-numbers of baryons and antibaryons. [...]
arXiv:2007.02463 ; CERN-TH-2020-116.
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Fulltext

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2020-07-08
05:08
Origins of the method to determine the CKM angle $\gamma$ using $B^{\pm} \to D K^{\pm}$, $D \to K_{\rm S}^0\pi^+\pi^-$ decays / Ceccucci, A. (CERN) ; Gershon, T. (Warwick U.) ; Kenzie, M. (Warwick U.) ; Ligeti, Z. (LBL, Berkeley) ; Sakai, Y. (KEK, Tsukuba) ; Trabelsi, K. (IJCLab, Orsay)
The angle $\gamma$ of the Cabibbo--Kobayashi--Maskawa unitarity triangle is a benchmark parameter of the Standard Model of particle physics. [...]
arXiv:2006.12404.
- 16 p.
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