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EP Preprints

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2019-11-15
09:29
Determination of quantum numbers for several excited charmed mesons observed in $B^- \to D^{*+} \pi^- \pi^-$ decays / LHCb Collaboration
A four-body amplitude analysis of the $B^- \to D^{*+} \pi^- \pi^-$ decay is performed, where fractions and relative phases of the various resonances contributing to the decay are measured. [...]
arXiv:1911.05957 ; CERN-EP-2019-201 ; LHCb-PAPER-2019-027 ; LHCB-PAPER-2019-027. - 2019. - 35 p, 35 p.
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2019-11-12
12:18
Measurement of the $\eta_c(1S)$ production cross-section in $pp$ collisions at $\sqrt{s} = 13$ TeV / LHCb Collaboration
Using a data sample corresponding to an integrated luminosity of $2.0\,fb^{-1}$, collected by the LHCb experiment, the production of the $\eta_c(1S)$ state in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13 \text{ TeV}$ is studied in the rapidity range ${2.0 < y < 4.5}$ and in the transverse momentum range ${6.5 < p_{T} < 14.0\text{ GeV}}$. [...]
arXiv:1911.03326 ; LHCb-PAPER-2019-024 ; CERN-EP-2019-214 ; LHCB-PAPER-2019-024. - 2019.
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2019-11-04
11:32
Updated measurement of decay-time-dependent CP asymmetries in $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ decays / LHCb Collaboration
A search for decay-time-dependent charge-parity ($CP$) asymmetry in $D^0 \to K^+K^-$ and $D^0 \to \pi^+\pi^-$ decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13TeV, and corresponding to an integrated luminosity of 5.4fb$^{-1}$. [...]
arXiv:1911.01114 ; CERN-EP-2019-225 ; LHCb-PAPER-2019-032 ; LHCB-PAPER-2019-032. - 2019.
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2019-10-22
16:33
Measurement of $f_s / f_u$ variation with proton-proton collision energy and kinematics / LHCb Collaboration
The ratio of the $B^0_s$ and $B^+$ fragmentation fractions $f_s$ and $f_u$ is studied with $B^0_s \to J/\psi \phi$ and $B^+ \to J/\psi K^+$ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8 and 13 TeV center-of-mass energies. [...]
arXiv:1910.09934 ; CERN-EP-2019-209 ; LHCb-PAPER-2019-020 ; LHCB-PAPER-2019-020. - 2019. - 26 p.
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2019-10-16
15:11
Search for $A' \to \mu^+ \mu^-$ decays / LHCb Collaboration
Searches are performed for both prompt-like and long-lived dark photons, $A'$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. [...]
arXiv:1910.06926 ; LHCb-PAPER-2019-031 ; CERN-EP-2019-212 ; LHCB-PAPER-2019-031. - 2019. - 27 p.
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2019-09-30
17:35
Search for the doubly charmed baryon $\Xi_{cc}^{+}$ / LHCb Collaboration
A search for the doubly charmed baryon $\Xi_{cc}^{+}$ is performed through its decay to the $\Lambda_c^+ K^- \pi^+$ final state, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13$\mathrm{\,Te\kern -0.1em V}$. [...]
arXiv:1909.12273 ; LHCb-PAPER-2019-029 ; CERN-EP-2019-199 ; LHCB-PAPER-2019-029. - 2019. - 25 p.
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2019-09-27
09:08
Study of charmonium production using decays to hadronic final states with the LHCb experiment / Usachov, Andrii (U. Paris-Saclay)
Studies of charmonium properties and production mechanism started with the discovery of $J/\psi$ meson. [...]
arXiv:1910.08796 ; CERN-THESIS-2019-141. - 2019. - 295 p.
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2019-09-13
11:15
Amplitude analysis of the $B^+ \to \pi^+ \pi^+ \pi^-$ decay / LHCb Collaboration
The results of an amplitude analysis of the charmless three-body decay $B^+ \to \pi^+ \pi^+ \pi^-$, in which $CP$-violation effects are taken into account, are reported. [...]
arXiv:1909.05212 ; LHCb-PAPER-2019-017 ; CERN-EP-2019-157 ; LHCB-PAPER-2019-017. - 2019. - 78 p.
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2019-09-13
11:11
Observation of several sources of $CP$ violation in $B^+ \to \pi^+ \pi^+ \pi^-$ decays / LHCb Collaboration
Observations are reported of different sources of $CP$ violation from an amplitude analysis of $B^+ \to \pi^+ \pi^+ \pi^-$ decays, based on a data sample corresponding to an integrated luminosity of $3 \; {\rm fb}^{-1}$ of $pp$ collisions recorded with the LHCb detector. [...]
arXiv:1909.05211 ; LHCb-PAPER-2019-018 ; CERN-EP-2019-156 ; LHCB-PAPER-2019-018. - 2019. - 18 p.
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2019-09-11
16:53
Fully hadronic ttH(bb) search / Ruiz Laborda, Guillermo (UZH)
Characterising the associated production of top quark pairs and Higgs bosons (ttH process) at the LHC is the most direct way to study the top quark Yukawa coupling, a crucial parameter of the standard model of Particle Physics. For the forthcoming analysis of the full datasets collected by CMS during the LHC Run 2, it is imperative to optimise the analysis techniques to make sure the best possible sensitivity is attained [...]
CERN-OPEN-2019-005.- Geneva : UZH, 2019 - 16 p. Preprint: PDF; External link: Approve this document (restricted)

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