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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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. [...]
arXiv:1612.05140; LHCB-PAPER-2016-031; CERN-EP-2016-201.- Geneva : CERN, 2017 - 21 p. - Published in : Phys. Rev. Lett. 118 (2017) 052002 Fulltext: arXiv:1612.05140 - PDF; 10.1103_PhysRevLett.118.052002 - PDF; Related data file(s): ZIP;

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2016-11-10
07:44
Measurement of the CKM angle $\gamma$ from a combination of LHCb results / LHCb collaboration
A combination of measurements sensitive to the CKM angle $\gamma$ from LHCb is performed. The inputs are from analyses of time-integrated $B^{+}\rightarrow DK^+$, $B_{d}^{0} \rightarrow D K^{*0}$, $B_{d} \rightarrow D K^+ \pi^-$ and $B^{+} \rightarrow D K^+\pi^+\pi^-$ tree-level decays. [...]
arXiv:1611.03076; LHCB-PAPER-2016-032; CERN-EP-2016-270.- Geneva : CERN, 2016 - 58 p. - Published in : J. High Energy Phys. 12 (2016) 087 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF;

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2016-10-27
08:36
Observation of the annihilation decay mode $B^{0}\to K^{+}K^{-}$ / LHCb collaboration
A search for the $B^{0}\to K^{+}K^{-}$ decay is performed using $pp$-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1 and 2 fb$^{-1}$ at center-of-mass energies of 7 and 8 TeV, respectively. [...]
LHCB-PAPER-2016-036; CERN-EP-2016-255; arXiv:1610.08288; LHCB-PAPER-2016-036; CERN-EP-2016-255.- Geneva : CERN, 2017 - 16 p. - Published in : Phys. Rev. Lett. 118 (2017) 081801 Fulltext: 10.1103_PhysRevLett.118.081801 - PDF; arXiv:1610.08288 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2016-10-27
08:35
Measurement of forward $t\overline{t}$, $W+b\overline{b}$ and $W+c\overline{c}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV / LHCb collaboration
The production of $t\overline{t}$, $W+b\overline{b}$ and $W+c\overline{c}$ is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 $\pm$ 0.02 $\mbox{fb}^{-1}$. The $W$ bosons are reconstructed in the decays $W\rightarrow\ell\nu$, where $\ell$ denotes muon or electron, while the $b$ and $c$ quarks are reconstructed as jets. [...]
arXiv:1610.08142; LHCB-PAPER-2016-038; CERN-EP-2016-232.- Geneva : CERN, 2017 - 20 p. - Published in : Phys. Lett. B 767 (2017) 110-120 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2016-10-18
08:01
Observation of the decay $B^0_s \to \phi\pi^+\pi^-$ and evidence for $B^0 \to \phi\pi^+\pi^-$ / LHCb collaboration
The first observation of the rare decay Bs0→ϕπ+π- and evidence for B0→ϕπ+π- are reported, using pp collision data recorded by the LHCb detector at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3  fb-1. The branching fractions in the π+π- invariant mass range 400<m(π+π-)<1600  MeV/c2 are [3.48±0.23±0.17±0.35]×10-6 and [1.82±0.25±0.41±0.14]×10-7 for Bs0→ϕπ+π- and B0→ϕπ+π- respectively, where the uncertainties are statistical, systematic and from the normalization mode Bs0→ϕϕ. [...]
arXiv:1610.05187; LHCB-PAPER-2016-028; CERN-EP-2016-213.- Geneva : CERN, 2017 - 25 p. - Published in : Phys. Rev. D 95 (2017) 012006 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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2016-10-13
08:18
Determination of the event collision time with the ALICE detector at the LHC / ALICE Collaboration
Particle identification is an important feature of the ALICE detector at the LHC. In particular, for particle identification via the time-of-flight technique, the precise determination of the event collision time represents an important ingredient of the quality of the measurement. [...]
CERN-EP-2016-253; arXiv:1610.03055; CERN-EP-2016-253.- Geneva : CERN, 2017 - 20 p. - Published in : Eur. Phys. J. Plus 132 (2017) 99 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2016-10-13
08:14
Search for the $C\!P$-violating strong decays $\eta \to \pi^+\pi^-$ and $\eta^\prime(958) \to \pi^+\pi^-$ / LHCb collaboration
A search for the $C\!P$-violating strong decays $\eta \to \pi^+\pi^-$ and $\eta^\prime(958) \to \pi^+\pi^-$ has been performed using approximately $2.5 \times 10^{7}$ events of each of the decays $D^+ \to \pi^+\pi^+\pi^-$ and $D_s^+ \to \pi^+\pi^+\pi^-$, recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0 fb$^{-1}$ of $pp$ collision data recorded during LHC Run 1 and 0.3 fb$^{-1}$ recorded in Run 2. [...]
arXiv:1610.03666; LHCB-PAPER-2016-046; CERN-EP-2016-257.- Geneva : CERN, 2017 - 17 p. - Published in : Phys. Lett. B 764 (2017) 233-240 Elsevier Open Access article: PDF; Preprint: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

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2016-10-06
09:47
Observation of $B^+\rightarrow J/\psi 3\pi^+ 2\pi^-$ and $B^+\rightarrow \psi(2S) \pi^+\pi^+\pi^-$ decays / LHCb Collaboration
The decays $B^+\rightarrow J/\psi 3\pi^+ 2\pi^-$ and $B^+\rightarrow \psi(2S) \pi^+\pi^+\pi^-$ are observed for the first time using a data sample corresponding to an integrated luminosity of $3.0fb^{-1}$, collected by the LHCb experiment in proton-proton collisions at the centre-of-mass energies of 7 and 8 TeV. The branching fractions relative to that of $B^+ \rightarrow \psi(2S)K^+$ are measured to be \begin{eqnarray*} \frac {\mathcal{B}\left( B^+\rightarrow J/\psi 3\pi^+ 2\pi^- \right)} {\mathcal{B}\left( B^+ \rightarrow \psi(2S)K^+ \right)} & = & \left( 1.88\pm0.17\pm0.09\right)\times10^{-2}, \\ \frac {\mathcal{B}\left( B^+\rightarrow \psi(2S) \pi^+\pi^+\pi^- \right)} {\mathcal{B}\left( B^+ \rightarrow \psi(2S)K^+ \right) } & = & \left( 3.04\pm0.50\pm0.26\right)\times10^{-2}, \end{eqnarray*} where the first uncertainties are statistical and the second are systematic..
CERN-EP-2016-247; LHCB-PAPER-2016-040; arXiv:1610.01383; LHCB-PAPER-2016-040; CERN-EP-2016-247.- Geneva : CERN, 2017 - 20 p. - Published in : Eur. Phys. J. C 77 (2017) 72 Fulltext: PDF; Related data file(s): ZIP;

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