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EP Preprints

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2019-02-15
15:26
Observation of $B^0_{(s)} \to J/\psi p \overline{p}$ decays and precision measurements of the $B^0_{(s)}$ masses
The first observation of the decays $B^0_{(s)} \to J/\psi p \overline{p}$ is reported, using proton-proton collision data corresponding to an integrated luminosity of $5.2{\text{fb}}^{-1}$, collected with the LHCb detector. [...]
CERN-EP-2019-006 ; arXiv:1902.05588 ; LHCB-PAPER-2018-046. - 2019.
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2019-02-15
10:02
Measurement of $B^+$, $B^0$ and $\Lambda_b^0$ production in $p\mkern 1mu\mathrm{Pb}$ collisions at $\sqrt{s_{NN}} = 8.16 \ \rm TeV$
The production of $B^+$, $B^0$ and $\Lambda_b^0$ hadrons is studied in proton-lead collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}}=8.16\,{\rm TeV}$ recorded with the LHCb detector at the LHC. [...]
CERN-EP-2019-010 ; arXiv:1902.05599 ; LHCB-PAPER-2018-048. - 2019.
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2019-02-07
15:59
Measurement of the ratio of branching fractions of the decays $\Lambda_b^0 \!\to \psi(2S) \Lambda$ and $\Lambda_b^0 \!\to J\!/\!\psi \Lambda$ / LHCb Collaboration
Using $pp$ collisions corresponding to 3$\,\text{fb}^{-1}$ integrated luminosity, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8$\,\text{TeV}$, the ratio of branching fractions \begin{align*} \mathcal{B}(\Lambda_b^0 \!\to \psi(2S) \Lambda)/\mathcal{B}(\Lambda_b^0 \!\to J\!/\!\psi \Lambda)= 0.513 \pm 0.023 \,(\text{stat}) \pm 0.016 \,(\text{syst}) \pm 0.011\, (\mathcal{B}) \end{align*} is determined. [...]
arXiv:1902.02092 ; LHCb-PAPER-2017-041 ; CERN-EP-2019-003 ; LHCB-PAPER-2017-041. - 2019.
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2019-01-22
15:12
Measurement of the mass and production rate of $\Xi_b^-$ baryons / LHCb Collaboration
The first measurement of the production rate of $\Xi_b^-$ baryons in $pp$ collisions relative to that of $\Lambda_b^0$ baryons is reported, using data samples collected by the LHCb experiment, and corresponding to integrated luminosities of 1, 2 and 1.6~fb$^{-1}$ at $\sqrt{s}=7,~8$ and 13~TeV, respectively. [...]
arXiv:1901.07075 ; LHCb-PAPER-2018-047 ; CERN-EP-2018-348 ; LHCB-PAPER-2018-047. - 2019. - 21 p.
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2019-01-16
11:27
Model-independent observation of exotic contributions to $B^0\to J/\psi K^+\pi^-$ decays / LHCb Collaboration
An angular analysis of $B^0\to J/\psi K^+\pi^-$ decays is performed, using proton-proton collision data corresponding to an integrated luminosity of 3 ${\rm fb}^{-1}$ collected with the LHCb detector. [...]
arXiv:1901.05745 ; LHCb-PAPER-2018-043 ; CERN-EP-2018-330 ; LHCB-PAPER-2018-043. - 2019. - 24 p.
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2018-12-20
11:46
Measurement of the branching fraction and $C\!P$ asymmetry in $B^{+}\rightarrow J/\psi \rho^{+}$ decays / LHCb Collaboration
The branching fraction and direct $C\!P$ asymmetry of the decay $B^{+}\rightarrow J/\psi \rho^{+}$ are measured using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to a total integrated luminosity of 3$\mbox{fb}^{-1}$. [...]
arXiv:1812.07041 ; LHCb-PAPER-2018-036 ; CERN-EP-2018-298 ; LHCB-PAPER-2018-036. - 2018. - 21 p.
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2018-12-19
11:38
Search for the rare decay $B^{+} \rightarrow \mu^{+}\mu^{-}\mu^{+}\nu_{\mu}$ / LHCb Collaboration
A search for the rare leptonic decay $B^{+} \rightarrow \mu^{+}\mu^{-}\mu^{+}\nu_{\mu}$ is performed using proton-proton collision data corresponding to an integrated luminosity of $4.7$ fb$^{-1}$ collected by the LHCb experiment. [...]
arXiv:1812.06004 ; CERN-EP-2018-293 ; LHCb-PAPER-2018-037 ; LHCB-PAPER-2018-037. - 2018. - 20 p.
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2018-12-19
10:18
Study of the $B^0\to \rho(770)^0 K^*(892)^0$ decay with an amplitude analysis of $B^0\to (\pi^+\pi^-) (K^+\pi^-)$ decays / LHCb Collaboration
An amplitude analysis of ${B^0\to (\pi^+\pi^-) (K^+\pi^-)}$ decays is performed in the two-body invariant mass regions ${300 < m(\pi^+\pi^-)<1100}$ MeV/$c^2$, accounting for the $\rho^0$, $\omega$, $f_0(500)$, $f_0(980)$ and $f_0(1370)$ resonances, and ${750 < m(K^+\pi^-)<1200}$ MeV/$c^2$, which is dominated by the $K^{*}(892)^0$ meson. [...]
arXiv:1812.07008 ; LHCb-PAPER-2018-042 ; CERN-EP-2018-316 ; LHCB-PAPER-2018-042. - 2018. - 28 p.
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2018-12-03
12:30
Strategic R&D Programme on Technologies for Future Experiments / Aleksa, Martin (CERN) ; Blomer, Jakob (CERN) ; Cure, Benoit (CERN) ; Campbell, Michael ; D'Ambrosio, Carmelo (CERN) ; Dannheim, Dominik (CERN) ; Doser, Michael (CERN) ; Faccio, Federico (CERN) ; Farthouat, Philippe (CERN) ; Gargiulo, Corrado (CERN) et al.
Instrumentation is a key ingredient for progress in experimental high energy physics [...]
CERN-OPEN-2018-006. - 2018. - 100 p.
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2018-11-22
12:02
Search for $CP$ violation through an amplitude analysis of $D^0\rightarrow K^+ K^- \pi^+ \pi^-$ decays / LHCb Collaboration
A search for $CP$ violation in the Cabibbo-suppressed $D^0\rightarrow K^+ K^- \pi^+ \pi^-$ decay mode is performed using an amplitude analysis. [...]
arXiv:1811.08304 ; LHCb-PAPER-2018-041 ; CERN-EP-2018-299 ; LHCB-PAPER-2018-041. - 2018. - 33 p.
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