EP Articles

Ostatnio dodane:
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;

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

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 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

2016-09-16
07:42
 Differential branching fraction and angular moments analysis of the decay $B^0 \to K^+ \pi^- \mu^+ \mu^-$ in the $K^*_{0,2}(1430)^0$ region / LHCb collaboration Measurements of the differential branching fraction and angular moments of the decay $B^0 \to K^+ \pi^- \mu^+ \mu^-$ in the $K^*_{0,2}(1430)^0$ in the $K^+\pi^-$ invariant mass range $1330 < m (K^+ \pi^-) <1530~ \text{MeV}/c^2$ are presented. Proton-proton collision data are used, corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by the LHCb experiment. [...] arXiv:1609.04736; CERN-EP-2016-215; LHCB-PAPER-2016-025.- Geneva : CERN, 2016 - 25 p. - Published in : J. High Energy Phys. 12 (2016) 065 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP;

2016-09-13
09:04
 Search for Higgs-like bosons decaying into long-lived exotic particles / LHCb collaboration A search is presented for massive long-lived particles, in the 20-60 GeV mass range with lifetimes between 5 and 100 ps. The dataset used corresponds to 0.62 1\fb of proton-proton collision data collected by the LHCb detector at sqrt(s)=7 TeV. [...] arXiv:1609.03124; LHCB-PAPER-2016-014; CERN-EP-2016-188.- Geneva : CERN, 2016 - 29 p. - Published in : Eur. Phys. J. C 76 (2016) 664 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

2016-09-09
08:33
 First experimental study of photon polarization in radiative $B^{0}_{s}$ decays / LHCb collaboration The polarization of photons produced in radiative $B^{0}_{s}$ decays is studied for the first time. The data are recorded by the LHCb experiment in $pp$ collisions corresponding to an integrated luminosity of 3fb$^{-1}$ at center-of-mass energies of $7$ and $8$TeV. [...] arXiv:1609.02032; LHCB-PAPER-2016-034; CERN-EP-2016-210.- Geneva : CERN, 2017 - 15 p. - Published in : Phys. Rev. Lett. 118 (2017) 021801 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint

2016-08-27
08:50
 Jet-like correlations with neutral pion triggers in pp and central Pb-Pb collisions at 2.76 TeV / ALICE Collaboration We present measurements of two-particle correlations with neutral pion trigger particles of transverse momenta $8 < p_{\mathrm{T}}^{\rm trig} < 16~\mathrm{GeV}/c$ and associated charged particles of $0.5 < p_{\mathrm{T}}^{\rm assoc} < 10~\mathrm{GeV}/c$ versus the azimuthal angle difference $\Delta\varphi$ at midrapidity in pp and central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV with ALICE. The new measurements exploit associated charged hadrons down to $0.5~\mathrm{GeV}/c$, which significantly extends our previous measurement that only used charged hadrons above $3~\mathrm{GeV}/c$. [...] arXiv:1608.07201; CERN-EP-2016-195.- Geneva : CERN, 2016 - 26 p. - Published in : Phys. Lett. B 763 (2016) 238-250 Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

2016-08-24
08:11
 Measurement of $CP$ violation in $B^0 \!\rightarrow D^+ D^-$ decays / LHCb collaboration The $C\!P$ violation observables $S$ and $C$ in the decay channel $B^0 \!\rightarrow D^+ D^-$ are determined from a sample of proton-proton collisions at centre-of-mass energies of $7$ and $8$ TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of $3~ {\text {fb}}^{-1}$. The observable $S$ describes $C\!P$ violation in the interference between mixing and the decay amplitude, and $C$ parametrizes direct $C\!P$ violation in the decay. [...] arXiv:1608.06620; LHCB-PAPER-2016-037; CERN-EP-2016-203.- Geneva : CERN, 2016 - 17 p. - Published in : Phys. Rev. Lett. 117 (2016) 261801 Fulltext: arXiv:1608.06620 - PDF; 10.1103_PhysRevLett.117.261801 - PDF; Related data file(s): ZIP; External link: Preprint

2016-08-19
08:22
 Measurement of the CP-violating phase and decay-width difference in $B_s^0\to\psi(2S)\phi$ decays / LHCb collaboration A time-dependent angular analysis of $B_s^0\to\psi(2S)\phi$ decays is performed using data recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0\invfb collected during Run 1 of the LHC. [...] arXiv:1608.04855; CERN-EP-2016-192; LHCB-PAPER-2016-027.- 2016 - 10 p. - Published in : Phys. Lett. B 762 (2016) 253-262 Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint

2016-08-05
08:00
 Measurement of forward $W\to e\nu$ production in $pp$ collisions at $\sqrt{s}=8$ TeV / LHCb collaboration A measurement of the cross-section for $W \to e\nu$ production in $pp$ collisions is presented using data corresponding to an integrated luminosity of $2\,$fb$^{-1}$ collected by the LHCb experiment at a centre-of-mass energy of $\sqrt{s}=8\,$TeV. The electrons are required to have more than $20\,$GeV of transverse momentum and to lie between 2.00 and 4.25 in pseudorapidity. [...] arXiv:1608.01484; LHCB-PAPER-2016-024; CERN-EP-2016-179.- Geneva : CERN, 2016 - 29 p. - Published in : J. High Energy Phys. 10 (2016) 030 Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint