# CERN Preprints

2016-10-25
14:37
 Measurements of charge and CP asymmetries in $b$-hadron decays using top-quark events collected by the ATLAS detector in $pp$ collisions at $\sqrt{s}=8$ TeV Same- and opposite-sign charge asymmetries are measured in lepton+jets $t\bar{t}$ events in which a $b$-hadron decays semileptonically to a soft muon, using data corresponding to an integrated luminosity of 20.3 $fb^{-1}$ from proton--proton collisions at a centre-of-mass energy of $\sqrt{s}=8$ TeV collected with the ATLAS detector at the Large Hadron Collider at CERN [...] CERN-EP-2016-221. - 2016. Fulltext - Previous draft version

2016-10-25
10:08
 Upgrade of the CMS Tracker for the High Luminosity LHC / Auzinger, Georg (CERN) /CMS Collaboration The LHC machine is planning an upgrade program which will smoothly bring the luminosity to about $5 \times 10^{34}$cm$^{-2}$s$^{-1}$ in 2028, possibly reaching an integrated luminosity of 3000 fb$^{-1}$ by the end of 2037. This High Luminosity LHC scenario, HL-LHC, will require a preparation program of the LHC detectors known as Phase-2 Upgrade. [...] CMS-CR-2016-268.- Geneva : CERN, 2016 - 8 p. Fulltext: PDF; In : 38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016

2016-10-25
10:08
 Phase 1 Front-End CMS Calorimeter (HE) Upgrade Preparation / Bunin, Pavel (Dubna, JINR) /CMS Collaboration Preparation of HE Phase 1 Front-End upgrade is shown. For the final quality control of the new generation HE front-end electronics components a Burn-in stand has been prepared. [...] CMS-CR-2016-265.- Geneva : CERN, 2016 - 6 p. Fulltext: PDF; In : 19th Annual RDMS CMS Collaboration Conference , Varna, Bulgaria, 7 - 10 Sep 2016

2016-10-24
17:32
 Determination of the spacial coordinates of fiducial marks on the 1975 2 meter hydrogen bubble chamber front window / Knudson, K CERN-D-Ph-II-200-75-1. - 1975. Full text

2016-10-24
13:49
 Some thoughts on the stacking efficiency of the Storage Ring / Hereward, H G CERN-PS-Int-AR-60-33. - 1960. - 26 p. Full text

2016-10-24
11:33
 Measurement of the $ZZ$ production cross section in proton--proton collisions at $\mathbf{\sqrt{s} = 8 TeV}$ using the $ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $ZZ\to\ell^{-}\ell^{+}\nu\bar{\nu}$ decay channels with the ATLAS detector A measurement of the $ZZ$ production in the $\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $\ell^{-}\ell^{+}\nu\bar{\nu}$ channels $(\ell = e, \mu)$ in proton--proton collisions at $\sqrt{s} = 8$ TeV at the Large Hadron Collider at CERN, using data corresponding to an integrated luminosity of 20.3 fb$^{-1}$ collected by the ATLAS experiment in 2012 is presented. [...] CERN-EP-2016-194. - 2016. Fulltext - Previous draft version

2016-10-24
07:21
 Exact $\nabla^4 R^4$ couplings and helicity supertraces / Bossard, Guillaume (U. Paris-Saclay) ; Pioline, Boris (Paris, LPTHE ; CERN) In type II string theory compactified on a $d$-dimensional torus $T^d$ down to $D=10-d$ dimensions, the $R^4$ and $\nabla^4 R^4$ four-graviton couplings are known exactly, for all values of the moduli, in terms of certain Eisenstein series of the U-duality group $E_{d}(\mathbb{Z})$. [...] arXiv:1610.06693 ; CERN-TH-2016-224 ; CPHT-RR046.102016. - 2016. - 40 p. Preprint - Full text

2016-10-22
23:11
 Observation of $\Upsilon(\mathrm{1S})$ pair production in proton-proton collisions at $\sqrt{s} =$ 8 TeV Pair production of $\Upsilon(\mathrm{1S})$ mesons is observed at the LHC in proton-proton collisions at $\sqrt{s} =$ 8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb$^{-1}$. [...] CERN-EP-2016-237 ; CMS-BPH-14-008-003. - 2016. Additional information for the analysis - CMS AuthorList - Fulltext

2016-10-22
07:28
 The Phase1 CMS Pixel detector upgrade / Tavolaro, Vittorio Raoul (Zurich, ETH) /CMS Collaboration The pixel detector of the CMS experiment will be replaced in an extended end-of-year shutdown during winter 2016/2017 with an upgraded one able to cope with peak instantaneous luminosities beyond the nominal LHC instantaneous luminosity of $1 \times 10^{34}$ cm$^{-2}$ s$^{-1}$. Under the conditions expected in the coming years, which will see an increase of a factor two in instantaneous luminosity, the present system would experience a dynamic inefficiency caused mainly by data losses due to buffer overflows. [...] CMS-CR-2016-249.- Geneva : CERN, 2016 - 9 p. Fulltext: PDF; In : International Workshop on Semiconductor Pixel Detectors for Particles and Imaging (PIXEL2016), Sestri Levante, Italy, 5 - 9 Sep 2016