CERN Accelerating science

EP Articles

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2017-03-01
12:41
Neutron capture cross section measurement of $^{238}$U at the n_TOF CERN facility in the energy region from 1 eV to 700 keV / n_TOF Collaboration
The aim of this work is to provide a precise and accurate measurement of the $^{238}$U(n,$\gamma$) reaction cross section in the energy region from 1 eV to 700 keV. This reaction is of fundamental importance for the design calculations of nuclear reactors, governing the behaviour of the reactor core. [...]
arXiv:1612.00200.- Bologna : Istituto Nazionale di Fisica Nucleare, 2016 - 14 p.

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2017-02-20
09:47
Test of an additive diquark spectator model for meson-baryon quasi-two-body reactions / Zralek, M (Nijmegen U.) ; Metzger, W J (Nijmegen U.) ; Van de Walle, R T (Nijmegen U.) ; Dionisi, C (CERN) ; Gurtu, A (CERN) ; Mazzucato, M (CERN) ; Foster, B (Oxford U.) /for the Amsterdam-CERN-Nijmegen-Oxford Collaboration
1978 Fulltext: PDF;
In : Meeting on Exotic Resonances, Hiroshima, Japan, 1 - 2 Sep 1978, pp.131

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2017-01-31
07:18
Observation of the suppressed decay $\Lambda^{0}_{b}\rightarrow p\pi^{-}\mu^{+}\mu^{-}$ / LHCb Collaboration
The suppressed decay $\Lambda^{0}_{b}\rightarrow p\pi^{-}\mu^{+}\mu^{-}$, excluding the $J/\psi$ and $\psi(2S)\rightarrow \mu^{+}\mu^{-}$ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of $3\mathrm{fb}^{-1}$ collected with the LHCb experiment. [...]
LHCB-PAPER-2016-049; CERN-EP-2016-312; arXiv:1701.08705.- Geneva : CERN, 2017 - 16 p. - Published in : J. High Energy Phys. 04 (2017) 029 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF;

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2017-01-21
07:23
Measurement of the $B^{\pm}$ production asymmetry and the $CP$ asymmetry in $B^{\pm} \to J/\psi K^{\pm}$ decays / LHCb Collaboration
The $B^{\pm}$ meson production asymmetry in $pp$ collisions is measured using $B^+ \to \bar{D}^0 \pi^+$ decays. The data were recorded by the LHCb experiment during Run 1 of the LHC at centre-of-mass energies of $\sqrt{s}=$ 7 and 8 TeV [...]
LHCB-PAPER-2016-054; CERN-EP-2016-325; arXiv:1701.05501; LHCB-PAPER-2016-054-CERN-EP-2016-325; LHCB-PAPER-2016-054.- Geneva : CERN, 2017 - 19 p. - Published in : Phys. Rev. D 95 (2017) 052005 APS Open Access article: PDF; Fulltext: arXiv:1701.05501 - PDF; 10.1103_PhysRevD.95.052005 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP;

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2017-01-09
11:13
Observation of $B_{c}^{+} \rightarrow D^{0} K^{+}$ decays / LHCb Collaboration
Using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, recorded by the LHCb detector at centre-of-mass energies of 7 and 8 TeV, the $B_{c}^{+} \rightarrow D^{0} K^{+}$ decay is observed with a statistical significance of 5.1 standard deviations. By normalising to $B^{+} \rightarrow \bar{D}^{0} \pi^{+}$ decays, a measurement of the branching fraction multiplied by the production rates for $B_{c}^{+}$ relative to $B^{+}$ mesons in the LHCb acceptance is obtained, $R_{D^{0} K} = \frac{f_{c}}{f_{u}} \times \mathcal{B}(B_{c}^{+} \rightarrow D^{0} K^{+}) = (9.3\,^{+2.8}_{-2.5} \pm 0.6) \times 10^{-7}$ , where the first uncertainty is statistical and the second is systematic. [...]
LHCB-PAPER-2016-058; CERN-EP-2016-314; arXiv:1701.01856; LHCB-PAPER-2016-058.- Geneva : CERN, 2017 - 15 p. - Published in : Phys. Rev. Lett. 118 (2017) 111803 APS Open Access article: PDF; Fulltext: arXiv:1701.01856 - PDF; 10.1103_PhysRevLett.118.111803 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP;

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2016-12-23
07:33
Measurement of the phase difference between short- and long-distance amplitudes in the $B^{+}\to K^{+}\mu^{+}\mu^{-}$ decay / LHCb Collaboration
A measurement of the phase difference between the short- and long-distance contributions to the $B^{+}\to K^{+}\mu^{+}\mu^{-}$ decay is performed by analysing the dimuon mass distribution. The analysis is based on $pp$ collision data corresponding to an integrated luminosity of 3 $\rm fb^{-1}$ collected by the LHCb experiment in 2011 and 2012. [...]
CERN-EP-2016-301; LHCB-PAPER-2016-045; arXiv:1612.06764.- Geneva : CERN, 2017 - 25 p. - Published in : Eur. Phys. J. C 77 (2017) 161 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF;

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2016-12-16
09:33
Measurement of the $b$-quark production cross-section in 7 and 13 TeV $pp$ collisions / LHCb Collaboration
Measurements of the cross-section for producing $b$ quarks in the reaction $pp \to b\overline{b}X$ are reported in $7$ and $13 TeV$ collisions at the LHC as a function of the pseudorapidity $\eta$ in the range $2<\eta<5$ covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of b-flavored hadrons decaying into a ground-state charmed hadron in association with a muon. [...]
CERN-EP-2016-201; LHCB-PAPER-2016-031; arXiv:1612.05140; LHCB-PAPER-2016-031; CERN-EP-2016-201.- Geneva : CERN, 2017 - 21 p. - Published in : Phys. Rev. Lett. 118 (2017) 052002 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP;

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2016-12-07
07:18
Search for massive long-lived particles decaying semileptonically in the LHCb detector / LHCb Collaboration
A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 1 and 2 1/fb, respectively. [...]
CERN-EP-2016-283; LHCB-PAPER-2016-047; arXiv:1612.00945.- Geneva : CERN, 2017 - 25. - Published in : Eur. Phys. J. C 77 (2017) 224 Additional figure: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF;

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2016-12-02
12:44
Search for decays of neutral beauty mesons into four muons / LHCb Collaboration
A search for the non-resonant decays $B^0_s \rightarrow \mu^{+}\mu^{-}\mu^{+}\mu^{-}$ and $B^0 \rightarrow \mu^{+}\mu^{-}\mu^{+}\mu^{-}$ is presented. The measurement is performed using the full Run 1 data set collected in proton-proton collisions by the LHCb experiment at the LHC [...]
LHCB-PAPER-2016-043; CERN-EP-2016-276; arXiv:1611.07704; LHCB-PAPER-2016-043; CERN-EP-2016-276.- Geneva : CERN, 2017 - 19 p. - Published in : J. High Energy Phys. 1703 (2017) 001 Fulltext: PDF; Springer Open Access article: PDF;

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2016-11-21
07:41
Measurements of charm mixing and $C\!P$ violation using $D^0 \to K^\pm \pi^\mp$ decays / LHCb collaboration
Measurements of charm mixing and $C\!P$ violation parameters from the decay-time-dependent ratio of $ D^0 \to K^+ \pi^- $ to $ D^0 \to K^- \pi^+ $ decay rates and the charge-conjugate ratio are reported. The analysis uses $\overline{B}\to D^{*+} \mu^- X$, and charge-conjugate decays, where $D^{*+}\to D^0 \pi^+$, and $D^0\to K^{\mp} \pi^{\pm}$. [...]
CERN-EP-2016-280; LHCB-PAPER-2016-033; arXiv:1611.06143; CERN-EP-2016-280; LHCB-PAPER-2016-033.- Geneva : CERN, 2017 - 24 p. - Published in : Phys. Rev. D 95 (2017) 052004 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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