S. Stone
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View article: $B_s$ Mixing via $\\psi K~*$
$B_s$ Mixing via $\\psi K~*$ Open
The decay mode $B_s\\to\\psi \\overline{K}~*$ is suggested as a very good way to measure the $B_s$ mixing parameter $x_s$. These decays can be gathered using a $\\psi\\to\\ell~+\\ell~-$ trigger. This final state has a well resolved four tr…
View article: Precise determination of the $B_s^0 - \overline{B}_s^0$ oscillation frequency
Precise determination of the $B_s^0 - \overline{B}_s^0$ oscillation frequency Open
Mesons comprising a beauty quark and a strange quark can oscillate between particle (B0s) and antiparticle (B0s) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, deltams. Here we …
View article: arXiv : Measurement of the photon polarization in $\Lambda_b \to \Lambda \gamma$ decays
arXiv : Measurement of the photon polarization in $\Lambda_b \to \Lambda \gamma$ decays Open
The photon polarization in $b \to s \gamma$ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of $\Lambda_b \to \Lambda \gamma$ decays. A data sample corresponding to an integrated…
View article: Measurement of the nuclear modification factor and prompt charged particle production in $p\mathrm{Pb}$ and $pp$ collisions at $\sqrt{s_{\scriptscriptstyle\mathrm{NN}}}=5\,\mathrm{TeV}$
Measurement of the nuclear modification factor and prompt charged particle production in $p\mathrm{Pb}$ and $pp$ collisions at $\sqrt{s_{\scriptscriptstyle\mathrm{NN}}}=5\,\mathrm{TeV}$ Open
The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon centre-of-mass energy ${\sqrt{s_{\scriptscriptstyle\mathrm{NN}}}=5\,\mathrm{TeV}}$ is studied at LHCb as a function…
View article: Measurement of prompt charged-particle production in $pp$ collisions at $\sqrt{s} = 13\,\mathrm{TeV}$
Measurement of prompt charged-particle production in $pp$ collisions at $\sqrt{s} = 13\,\mathrm{TeV}$ Open
The differential cross-section of prompt inclusive production of long-lived charged particles in proton-proton collisions is measured using a data sample recorded by the LHCb experiment at a centre-of-mass energy of $ \\sqrt{s} $ = 13 TeV.…
View article: Search for the doubly heavy baryons $\\it{\\Xi}_{bc}^{\\rm0}$ and $\\it{\\Omega}_{bc}^{\\rm0}$ decaying to $\\it{\\Lambda_{c}^{+}\\pi^{-}}$ and $\\it{\\Xi_{c}^{+}\\pi^{-}}$
Search for the doubly heavy baryons $\\it{\\Xi}_{bc}^{\\rm0}$ and $\\it{\\Omega}_{bc}^{\\rm0}$ decaying to $\\it{\\Lambda_{c}^{+}\\pi^{-}}$ and $\\it{\\Xi_{c}^{+}\\pi^{-}}$ Open
A search for the doubly heavy baryons $\\it{\\Xi}_{bc}^{\\rm0}$ and $\\it{\\Omega}_{bc}^{\\rm0}$ is performed using $pp$ collision data collected with the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of $13TeV$, correspondi…
View article: Test of lepton universality in beauty-quark decays
Test of lepton universality in beauty-quark decays Open
The Standard Model of particle physics currently provides our best description of fundamental particles and their interactions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak …
View article: Observation of the decay $\Lambda_b^0\rightarrow\chi_{c1}p\pi^-$
Observation of the decay $\Lambda_b^0\rightarrow\chi_{c1}p\pi^-$ Open
View article: Search for time-dependent $CP$ violation in $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays
Search for time-dependent $CP$ violation in $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays Open
A search for time-dependent violation of the charge-parity symmetry in D0→K+K- and D0→π+π- decays is performed at the LHCb experiment using proton-proton collision data recorded from 2015 to 2018 at a center-of-mass energy of 13 TeV, corre…
View article: Observation of the $B_s^0 \rightarrow D^{\ast \pm} D^{\mp}$ decay
Observation of the $B_s^0 \rightarrow D^{\ast \pm} D^{\mp}$ decay Open
A search for the $B^0_s \\!\\rightarrow D^{*\\pm} D^\\mp$ decay is performed using proton-proton collision data at centre-of-mass energies of $7$, $8$ and $13\\,\\text{TeV}$ collected by the LHCb experiment, corresponding to an integrated …
View article: Measurement of the $B^0_s\to\mu^+\mu^-$ decay properties and search for the $B^0\to\mu^+\mu^-$ and $B^0_s\to\mu^+\mu^-\gamma$ decays
Measurement of the $B^0_s\to\mu^+\mu^-$ decay properties and search for the $B^0\to\mu^+\mu^-$ and $B^0_s\to\mu^+\mu^-\gamma$ decays Open
An improved measurement of the decay $B^0_s\\to\\mu^+\\mu^-$ and searches for the decays $B^0\\to\\mu^+\\mu^-$ and $B^0_s\\to\\mu^+\\mu^-\\gamma$ are performed at the LHCb experiment using data collected in proton-proton collisions at $\\s…
View article: Evidence for a new structure in the $J/\psi p$ and $J/\psi \bar{p}$ systems in $B_s^0 \to J/\psi p \bar{p}$ decays
Evidence for a new structure in the $J/\psi p$ and $J/\psi \bar{p}$ systems in $B_s^0 \to J/\psi p \bar{p}$ decays Open
An amplitude analysis of flavour-untagged $B_s^0 \\to J/\\psi p \\bar{p}$ decays is performed using a sample of $797\\pm31$ decays reconstructed with the LHCb detector. The data, collected in proton-proton collisions between 2011 and 2018,…
View article: Evidence of a $J/\\psi \\varLambda$ structure and observation of excited $\\varXi^-$ states in the $\\varXi_b^-\\to J/\\psi \\varLambda K^-$ decay
Evidence of a $J/\\psi \\varLambda$ structure and observation of excited $\\varXi^-$ states in the $\\varXi_b^-\\to J/\\psi \\varLambda K^-$ decay Open
First evidence of a structure in the $J/\\psi \\varLambda$ invariant mass distribution is obtained from an amplitude analysis of $\\varXi_b^- \\to J/\\psi \\varLambda K^-$ decays. The observed structure is consistent with being due to a ch…
View article: Search for the rare decay $B^0 \to J/\psi\phi$
Search for the rare decay $B^0 \to J/\psi\phi$ Open
A search for the rare decay $B^{0} \\rightarrow J/\\psi \\phi$ is performed using $pp$ collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 ${\\rm fb}…
View article: Measurement of $|V_{cb}|$ with $B_s^0 \to D_s^{(*)-} \mu^+ \nu_{\mu}$ decays
Measurement of $|V_{cb}|$ with $B_s^0 \to D_s^{(*)-} \mu^+ \nu_{\mu}$ decays Open
The element $|V_{cb}|$ of the Cabibbo-Kobayashi-Maskawa matrix is measured using semileptonic $B_s^0$ decays produced in proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding…
View article: First Beam Test of UT Sensors with the SALT 3.0 Readout ASIC
First Beam Test of UT Sensors with the SALT 3.0 Readout ASIC Open
This note presents the results of a beam test conducted at the Fermilab test beam facility in March 2019. The beam test represents the first such test of the UT readout ASIC, SALT 3.0, in a beam with production UT sensors. Two sensors were…
View article: Methods of determining the absolute branching fractions of $Λ_c^+$ baryons and $D_s^+$ mesons at hadron colliders
Methods of determining the absolute branching fractions of $Λ_c^+$ baryons and $D_s^+$ mesons at hadron colliders Open
Current absolute branching fractions of $Λ_c^+$ and $D_s^+$ mesons are limiting the determination of important measurements. They have only been measured at $e^+e^-$ colliders. Here techniques for measuring them at hadron colliders are dis…
View article: Methods of determining the absolute branching fractions of $\Lambda_c^+$ baryons and $D_s^+$ mesons at hadron colliders
Methods of determining the absolute branching fractions of $\Lambda_c^+$ baryons and $D_s^+$ mesons at hadron colliders Open
Current absolute branching fractions of $\Lambda_c^+$ and $D_s^+$ mesons are limiting the determination of important measurements. They have only been measured at $e^+e^-$ colliders. Here techniques for measuring them at hadron colliders a…
View article: Measurement of the $CP$-violating phase $\phi_s$ from $B_{s}^{0}\to J/\psi\pi^+\pi^-$ decays in 13 TeV $pp$ collisions
Measurement of the $CP$-violating phase $\phi_s$ from $B_{s}^{0}\to J/\psi\pi^+\pi^-$ decays in 13 TeV $pp$ collisions Open
Decays of $B_{s}^{0}$ and $\\overline{B}{}_{s}^{0}$ mesons into $J/\\psi\\pi^+\\pi^-$ final states are studied in a data sample corresponding to 1.9 fb$^{-1}$ of integrated luminosity collected with the LHCb detector in 13 TeV $pp$ collisi…
View article: Observation of the decay $\overline{B_s^0} \rightarrow \chi_{c2} K^+ K^- $
Observation of the decay $\overline{B_s^0} \rightarrow \chi_{c2} K^+ K^- $ Open
View article: Observation of the decay B0s→¯D0K+K−
Observation of the decay B0s→¯D0K+K− Open
View article: Observation of the decay $\Lambda_b^0 \to \Lambda_c^+ p \overline{p} \pi^-
Observation of the decay $\Lambda_b^0 \to \Lambda_c^+ p \overline{p} \pi^- Open
The decay $\\Lambda_b^0 \\to \\Lambda_c^+ p \\overline{p} \\pi^-$ is observed using $pp$ collision data collected with the LHCb detector at centre-of-mass energies of $\\sqrt{s}=$ 7 and 8 TeV, corresponding to an integrated luminosity of 3…
View article: Search for lepton-flavour-violating decays of Higgs-like bosons
Search for lepton-flavour-violating decays of Higgs-like bosons Open
A search is presented for a Higgs-like boson with mass in the range 45 to 195 GeV / c 2 decaying into a muon and a tau lepton. The dataset consists of proton-proton interactions at a centre-of-mass energy of 8 TeV , collected by the LHCb e…
View article: Signal coupling to embedded pitch adapters in silicon sensors
Signal coupling to embedded pitch adapters in silicon sensors Open
We have examined the effects of embedded pitch adapters on signal formation\nin n-substrate silicon microstrip sensors with data from beam tests and\nsimulation. According to simulation, the presence of the pitch adapter metal\nlayer chang…
View article: Measurement of $CP$ violation in $B^0\\rightarrow J/\\psi K^0_\\mathrm{S}$ and $B^0\\rightarrow\\psi(2S) K^0_\\mathrm{S}$ decays
Measurement of $CP$ violation in $B^0\\rightarrow J/\\psi K^0_\\mathrm{S}$ and $B^0\\rightarrow\\psi(2S) K^0_\\mathrm{S}$ decays Open
A measurement is presented of decay-time-dependent CP violation in the decays B$^{0}$ → J/ψ K$_{S}^{0}$ and B$^{0}$ → ψ(2S)K$_{S}^{0}$ , where the J/ψ is reconstructed from two electrons and the ψ(2S) from two muons. The analysis uses a sa…
View article: Exotics: Heavy pentaquarks and tetraquarks
Exotics: Heavy pentaquarks and tetraquarks Open
View article: Expression of Interest for a Phase-II LHCb Upgrade: Opportunities in flavour physics, and beyond, in the HL-LHC era
Expression of Interest for a Phase-II LHCb Upgrade: Opportunities in flavour physics, and beyond, in the HL-LHC era Open
A Phase-II Upgrade is proposed for the LHCb experiment in order to take full advantage of the flavour-physics opportunities at the HL-LHC, and other topics that can be studied with a forward spectrometer. This Upgrade, which will be instal…
View article: Measurement of $B^0_s$ and $D^-_s$ meson lifetimes
Measurement of $B^0_s$ and $D^-_s$ meson lifetimes Open
We report on a measurement of the flavor-specific $B^0_s$ lifetime and of the $D^-_s$ lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 $fb^{−1}$ of…
View article: Measurement of $CP$ asymmetries in $D^{\pm} ightarrow \eta^{\prime} \pi^{\pm}$ and $D_s^{\pm} ightarrow \eta^{\prime} \pi^{\pm}$ decays
Measurement of $CP$ asymmetries in $D^{\pm} ightarrow \eta^{\prime} \pi^{\pm}$ and $D_s^{\pm} ightarrow \eta^{\prime} \pi^{\pm}$ decays Open
View article: Pentaquarks and Tetraquarks at LHCb
Pentaquarks and Tetraquarks at LHCb Open
Exotic resonant structures found in $Λ^0_b$ and $\overline{B}^0$ decays into charmonium in the LHCb experiment are discussed. Examination of the $J/ψp$ system in $Λ^0_b\to J/ψK^- p$ decays shows two states each of which must be composed of…