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EP Articles

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2018-05-09
13:47
Measurement of $CP$ violation in $B^{0}\rightarrow D^{\mp}\pi^{\pm}$ decays / LHCb Collaboration
A measurement of the $CP$ asymmetries $S_{f}$ and $S_{\bar{f}}$ in $B^0\to D^{\mp}\pi^{\pm}$ decays is reported. The decays are reconstructed in a dataset collected with the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of $3.0 \rm{ fb}^{-1}$. [...]
LHCb-PAPER-2018-009; CERN-EP-2018-084; LHCB-PAPER-2018-009; CERN-EP-2018-084; arXiv:1805.03448; LHCB-PAPER-2018-009.- Geneva : CERN, 2018-06-18 - 24 p. - Published in : JHEP 06 (2018) 084 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2018-04-20
14:41
Evidence for the decay $B_{s}^0 \rightarrow \overline{K}{}^{*0}\mu^+\mu^-$ / LHCb Collaboration
A search for the decay $B_{s}^0 \rightarrow \overline{K}{}^{*0}\mu^+\mu^-$ is presented using data sets corresponding to 1.0, 2.0 and 1.6 $\text{fb}^{-1}$ of integrated luminosity collected during $pp$ collisions with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, respectively. An excess is found over the background-only hypothesis with a significance of 3.4 standard deviations. [...]
LHCb-PAPER-2018-004; CERN-EP-2018-059; LHCB-PAPER-2018-004; CERN-EP-2018-059; arXiv:1804.07167; LHCB-PAPER-2018-004.- Geneva : CERN, 2018-07-03 - 25 p. - Published in : JHEP 07 (2018) 020 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2018-04-06
10:58
Measurement of the $CP$ asymmetry in $B^-\to D_s^-D^0$ and $B^-\to D^-D^0$ decays / LHCb Collaboration
The $CP$ asymmetry in $B^-\to D_s^-D^0$ and $B^-\to D^-D^0$ decays is measured using LHCb data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. The results are $A^{CP}(B^-\to D_s^-D^0)=(-0.4\pm 0.5\pm 0.5)\%$ and $A^{CP}(B^-\to D^-D^0)=( 2.3\pm 2.7\pm 0.4)\%$, where the first uncertainties are statistical and the second systematic. [...]
LHCb-PAPER-2018-007; CERN-EP-2018-046; LHCB-PAPER-2018-007; CERN-EP-2018-046; arXiv:1803.10990.- Geneva : CERN, 2018-05-25 - 18 p. - Published in : 10.1007/JHEP05(2018)160 Article from SCOAP3: PDF; Fulltext: LHCb-PAPER-2018-007 - PDF; 1803.10990 - PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2018-03-29
17:40
Search for the Standard Model Higgs Boson at LEP /DELPHI Collaboration ; ALEPH Collaboration ; L3 Collaboration ; OPAL Collaboration
The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have collected 2461 pb−1 of e+e− collision data at centre-of-mass energies between 189 and 209 GeV, of which 536 pb−1 have energies above 206 GeV. The data have been used to search for the Standard Model Higgs boson. [...]
CERN-ALEPH-2002-024; CERN-ALEPH-CONF-2002-013; DELPHI-2002-088-CONF-621; CERN-DELPHI-2002-088-CONF-621; L3-Note-2766; OPAL-TN721; LHWG-Note-2002-01.- Geneva : CERN, 2002 - 28 p. Fulltext: cer-002264432 - PDF; aleph-2002-024 - PDF;
In : 31st International Conference on High Energy Physics, Amsterdam, The Netherlands, 25 - 31 Jul 2002

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2018-03-29
15:29
Measurement of the inelastic $pp$ cross-section at a centre-of-mass energy of 13\,TeV / LHCb Collaboration
The cross-section for inelastic proton-proton collisions at a centre-of-mass energy of 13\,TeV is measured with the LHCb detector. The fiducial cross-section for inelastic interactions producing at least one prompt long-lived charged particle with momentum $p>2$\,GeV/$c$ in the pseudorapidity range $2<\eta<5$ is determined to be $\sigma_{\rm acc}= 62.2 \pm 0.2 \pm 2.5$\,mb. [...]
LHCb-PAPER-2018-003; CERN-EP-2018-044; LHCB-PAPER-2018-003; CERN-EP-2018-044; arXiv:1803.10974; LHCB-PAPER-2018-003.- Geneva : CERN, 2018-06-20 - 18 p. - Published in : JHEP 06 (2018) 100 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2018-03-26
10:15
Search for $B_c^+$ decays to two charm mesons / LHCb Collaboration
A search for decays of $B_c^+$ mesons to two charm mesons is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. The decays considered are $B_c^+\to D^{(*)+}_{(s)} \overline{D}^{(*)0}$ and $B_c^+\to D^{(*)+}_{(s)} D^{(*)0}$, which are normalised to high-yield $B^+\to D^+_{(s)} \overline{D}^0$ decays. [...]
LHCB-PAPER-2017-045; CERN-EP-2017-313; arXiv:1712.04702; LHCB-PAPER-2017-045.- Geneva : CERN, 2018-05 - 20 p. - Published in : Nucl. Phys. B 930 (2018) 563-582 Article from SCOAP3: PDF; Fulltext: PDF; Preprint: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2018-01-12
14:34
Evidence for the rare decay $\Sigma^+ \to p \mu^+ \mu^-$ / LHCb Collaboration
A search for the rare decay $\Sigma^+ \to p \mu^+ \mu^-$ is performed using $pp$ collision data recorded by the LHCb experiment at centre-of-mass energies $\sqrt{s} = 7$ and $8$ TeV, corresponding to an integrated luminosity of $3 fb^{-1}$. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. [...]
LHCB-PAPER-2017-049; CERN-EP-2017-319; arXiv:1712.08606.- Geneva : CERN, 2018-06-01 - 10 p. - Published in : Phys. Rev. Lett. 120 (2018) 221803 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2018-01-11
09:32
Studies of the resonance structure in $D^{0} \to K^\mp \pi^\pm \pi^\pm \pi^\mp$ decays / LHCb Collaboration
Amplitude models are constructed to describe the resonance structure of ${D^{0}\to K^{-}\pi^{+}\pi^{+}\pi^{-}}$ and ${D^{0} \to K^{+}\pi^{-}\pi^{-}\pi^{+}}$ decays using $pp$ collision data collected at centre-of-mass energies of 7 and 8 TeV with the LHCb experiment, corresponding to an integrated luminosity of $3.0\mathrm{fb}^{-1}$. The largest contributions to both decay amplitudes are found to come from axial resonances, with decay modes $D^{0} \to a_1(1260)^{+} K^{-}$ and $D^{0} \to K_1(1270/1400)^{+} \pi^{-}$ being prominent in ${D^{0}\to K^{-}\pi^{+}\pi^{+}\pi^{-}}$ and $D^{0}\to K^{+}\pi^{-}\pi^{-}\pi^{+}$, respectively. [...]
LHCB-PAPER-2017-040; CERN-EP-2017-314; arXiv:1712.08609; LHCB-PAPER-2017-040-CERN-EP-2017-314.- Geneva : CERN, 2018-06-02 - 31 p. - Published in : 10.1140/epjc/s10052-018-5758-4 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP; External link: Previous draft version

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2018-01-08
14:52
First measurement of the $CP$-violating phase $\phi_s^{d\overline{d}}$ in $B_s^0\to(K^+\pi^-)(K^-\pi^+)$ decays / LHCb Collaboration
A flavour-tagged decay-time-dependent amplitude analysis of $B_s^0\to(K^+\pi^-)(K^-\pi^+)$ decays is presented in the $K^{\pm}\pi^{\mp}$ mass range from 750 to 1600 MeV$/c^2$. The analysis uses $pp$ collision data collected with the LHCb detector at centre-of-mass energies of $7$ and $8$ TeV, corresponding to an integrated luminosity of $3.0$ fb$^{-1}$. [...]
LHCB-PAPER-2017-048; CERN-EP-2017-320; arXiv:1712.08683.- Geneva : CERN, 2018-03-23 - 33 p. - Published in : JHEP 03 (2018) 140 Article from SCOAP3: PDF; Fulltext: PDF; Preprint: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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2017-12-22
09:56
Search for weakly decaying $b$-flavored pentaquarks / LHCb Collaboration
Investigations of the existence of pentaquark states containing a single $b$ (anti)quark decaying weakly into four specific final states J/$\psi K^+\pi^- p$, J/$\psi K^- \pi^- p$, J/$\psi K^- \pi^+ p$, and $J/\psi \phi (1020) p$ are reported. The data sample corresponds to an integrated luminosity of 3.0/fb in 7 and 8 TeV pp collisions acquired with the LHCb detector. [...]
CERN-EP-2017-329; LHCB-PAPER-2017-043; arXiv:1712.08086; LHCB-PAPER-2017-043.- Geneva : CERN, 2018-02-17 - 11 p. - Published in : Phys. Rev. D 97 (2018) 032010 Article from SCOAP3: PDF; Preprint: PDF; Related data file(s): ZIP;

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