# CERN Preprints

2017-02-23
10:55
 Measurement of the $C\!P$ violation parameter $A_\Gamma$ in $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ decays Asymmetries in the time-dependent rates of $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays are measured in a $pp$ collision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integrated luminosity of $3\,\mathrm{fb}^{-1}$. [...] CERN-EP-2017-028 ; LHCB-PAPER-2016-063. - 2017. Fulltext - Previous draft version - Related data file(s)

2017-02-23
07:06
 Multiple D3-instantons and mock modular forms II / Alexandrov, Sergei (U. Montpellier, L2C ; CERN) ; Banerjee, Sibasish (IPhT, Saclay) ; Manschot, Jan (Trinity Coll., Dublin ; Hamilton Math. Inst., Dublin) ; Pioline, Boris (CERN ; Paris, LPTHE ; UPMC, Paris (main)) We analyze the modular properties of D3-brane instanton corrections to the hypermultiplet moduli space in type IIB string theory compactified on a Calabi-Yau threefold. [...] arXiv:1702.05497 ; L2C:17-011 ; CERN-TH-2017-040 ; IPHT-T17-020. - 2017. - 48 p. Full text

2017-02-23
07:06

2017-02-22
08:09
 Results (and future prospects) of the CMS experiment in photon-induced interactions in p-Pb collisions / Bylinkin, Alexander (Moscow, MIPT ; Moscow Phys. Eng. Inst.) Exclusive vector meson photoproduction is studied in ultra-peripheral pPb collisions at p sNN = 5:02 TeV with the CMS experiment at the LHC. [...] CMS-CR-2016-346. - 6 p. Full text

2017-02-22
06:42

2017-02-21
16:11
 A General Method for Motion Compensation in X-ray Computed Tomography / Hancock, Steven (CERN) ; Biguri, Ander (Bath U.) ; Dosanjh, Manjit (CERN) ; Soleimani, Manuchehr (Bath U.) Motion during data acquisition is a known source of error in medical tomography, resulting in blur artefacts in the regions that move. [...] CERN-OPEN-2017-018. - 2017. - 22 p. Preprint

2017-02-21
14:13
 Observation of the suppressed decay $\Lambda^0_b \to p \pi^- \mu^+ \mu^-$ The suppressed decay $\Lambda^0_b \to p\pi^- \mu^+ \mu^-$ , excluding the $J/\psi$ and $\psi (2S) \to \mu^+ \mu^-$ resonances, is observed for the first time with a significance of $5.5$ standard deviations. [...] CERN-EP-2016-312 ; LHCB-PAPER-2016-049. - 2017. Fulltext - Previous draft version - Related data file(s)

2017-02-21
13:05
 Performance of the ATLAS Transition Radiation Tracker in Run 1 of the LHC: tracker properties The tracking performance parameters of the ATLAS Transition Radiation Tracker (TRT) as part of the ATLAS inner detector are described in this paper for different data-taking conditions in proton--proton, proton--lead and lead--lead collisions at the Large Hadron Collider (LHC). [...] CERN-EP-2016-311. - 2017. Fulltext - Previous draft version

2017-02-21
12:51
 Measurements of the production cross section of a $Z$ boson in association with jets in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector Measurements of the production cross section of a $Z$ boson in association with jets in proton-proton collisions at $\sqrt{s} = 13$ TeV are presented, using data corresponding to an integrated luminosity of 3.16 fb$^{-1}$ collected by the ATLAS experiment at the CERN Large Hadron Collider in 2015. [...] CERN-EP-2016-297. - 2017. Fulltext - Previous draft version

2017-02-21
06:46
 Measurement of parameters of scintillating bars with wavelength-shifting fibres and silicon photomultiplier readout for the SHiP Muon Detector / Montanari, A (INFN, Bologna) ; Tosi, N (INFN, Bologna) ; Baldini, W (INFN, Ferrara) ; Calcaterra, A (Frascati) ; Lanfranchi, G (Frascati) ; Saputi, A (Frascati) ; Khotjantsev, A (Moscow, INR) ; Kudenko, Yu (Moscow, MIPT ; Moscow, INR ; Moscow Phys. Eng. Inst.) ; Kurochka, V (Moscow, INR) ; Mefodiev, A (Moscow, INR) et al. The light yield and the time resolution of different types of 3 m long scintillating bars instrumented with wavelength shifting fibres and read out by different models of silicon photomultipliers have been measured at a test beam at the T9 area at the CERN Proton Synchrotron. [...] arXiv:1612.01125. - 2016. - 20 p. 00009 Light yield scan across 3 cm, 5 cm and 10 cm bars (a). Attenuation of scintillating light in the opposite directions from a fibre in the 10 cm bar (b). - 00006 Sum of the light yield measured at each as a function of the beam position along the bar for L2, L1, L4 bar. - 00004 L2 bar: light yield measured at each end (red squares and blue solid circles) and the sum of the light yields measured at both ends (black open circles) as a function of the incident beam position along the bar. - 00003 L1 bar: light yield measured at each end (red squares and blue solid circles) and the sum of the light yields at both ends (black open circles) as a function of the incident beam position along the bar. - 00007 Light yield scan for 3 cm bars U1 (a) and 5 cm bars U2 (b). - 00002 Example of distribution of the sum of the light yield collected at both ends of a 2 cm thick NICADD bar. - 00014 L2 bar time resolution using only SiPM $L$($R$), red circles(blue squares) and both SiPMs (green triangles). - 00013 L1 bar time resolution using only SiPM $L$($R$), red circles(blue squares) and both SiPMs (green triangles). - 00015 L4 bar time resolution using only SiPM $L$($R$), red circles(blue squares) and both SiPMs (green triangles). - 00001 Example of MPPC spectrum used for the calibration of the light yield. - 00008 Light yield scan for 10 cm bars U3 (a) and U4 (b). - 00000 Four types of bars manufactured at UNIPLAST factory. - 00018 Time resolution for 10 cm bars with 2 MPPC readout (a) and 4 MPPC readout (b). - 00017 Time resolution for 3 cm (a) and 5 cm bars (b) vs position along the bars. - 00011 Example of baseline-subtracted waveform for 2 cm thick NICADD bars. - 00010 The inefficiency for 3 and 5 cm wide bars as a function of the charge detection threshold. The events are counted if the charge is over the specified threshold at each bar end. - 00005 L4 bar: light yield measured at each end (red squares and blue solid circles) and the sum of the light yields measured at both ends (black open circles) as a function of the beam position along the bar. - 00016 Fitting of digitized pulse shape to obtain the timing mark. - 00012 Speed of light propagation $v_f$ in L2 fibre, for signals read by SiPM left (red line) and right (blue line); $v_f$ is measured as $(16.0\pm0.1)$ cm/ns. - Full text