M. Merk
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View article: TrackHHL: A Quantum Computing Algorithm for Track Reconstruction at the LHCb
TrackHHL: A Quantum Computing Algorithm for Track Reconstruction at the LHCb Open
In the future high-luminosity LHC era, high-energy physics experiments face unprecedented computational challenges for event reconstruction. Employing the LHCb vertex locator as a case study we investigate a novel approach for charged part…
View article: The LHCb VELO Upgrade module construction
The LHCb VELO Upgrade module construction Open
The LHCb detector has undergone a major upgrade for LHC Run 3. This Upgrade I detector facilitates operation at higher luminosity and utilises full-detector information at the LHC collision rate, critically including the use of vertex info…
View article: The LHCb VELO Upgrade Module Construction
The LHCb VELO Upgrade Module Construction Open
The LHCb detector has undergone a major upgrade for LHC Run 3. This Upgrade I detector facilitates operation at higher luminosity and utilises full-detector information at the LHC collision rate, critically including the use of vertex info…
View article: A quantum algorithm for track reconstruction in the LHCb vertex detector
A quantum algorithm for track reconstruction in the LHCb vertex detector Open
High-energy physics is facing increasingly demanding computational challenges in real-time event reconstruction for the near-future high-luminosity era. Using the LHCb vertex detector as a use case, we explore a new algorithm for particle …
View article: A quantum algorithm for track reconstruction in the LHCb vertex detector
A quantum algorithm for track reconstruction in the LHCb vertex detector Open
High-energy physics is facing increasingly computational challenges in real-time event reconstruction for the near-future high-luminosity era. Using the LHCb vertex detector as a use-case, we explore a new algorithm for particle track reco…
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: Readout Firmware of the Vertex Locator for LHCb Run 3 and Beyond
Readout Firmware of the Vertex Locator for LHCb Run 3 and Beyond Open
The new LHCb Vertex Locator (VELO) for LHCb, comprising a new pixel detector and readout electronics, will be installed in 2021 for data taking in Run 3 at the LHC. The electronics centers around the “VeloPix” ASIC at the front-end operati…
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: The upgrade I of LHCb VELO—towards an intelligent monitoring platform
The upgrade I of LHCb VELO—towards an intelligent monitoring platform Open
The Large Hadron Collider beauty (LHCb) detector is designed to detect decays\nof b- and c- hadrons for the study of CP violation and rare decays. At the end\nof the LHC Run 2, many of the LHCb measurements remained statistically\ndominate…
View article: Phase I Upgrade of the Readout System of the Vertex Detector at the LHCb Experiment
Phase I Upgrade of the Readout System of the Vertex Detector at the LHCb Experiment Open
This article describes the high-speed system designed to meet the challenging requirements for the readout of the new pixel VErtex LOcator (VELO) of the upgraded LHCb experiment. All elements of the electronics readout chain will be renewe…
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: Velo Upgrade Module Nomenclature
Velo Upgrade Module Nomenclature Open
The nomenclature and geometry of the various constituents of velo upgrade hybrid sensors are defined, as well as their position within the modules. The modules nomenclature and their position along the z-axis are defined.
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: Measurement of the $CP$ asymmetry in $B^-\to D_s^-D^0$ and $B^-\to D^-D^0$ decays
Measurement of the $CP$ asymmetry in $B^-\to D_s^-D^0$ and $B^-\to D^-D^0$ decays Open
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 result…
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: 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…