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EP Preprints

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2021-04-15
11:14
Precise determination of the $B^0_s$-$\overline{B}^0_s$ oscillation frequency
Mesons comprising a beauty quark and a strange quark can oscillate between particle ($B^0_s$) and antiparticle ($\overline{B}^0_s$) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, $\Delta m_{s}$. [...]
CERN-EP-2021-047 ; LHCB-PAPER-2021-005. - 2021.
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2021-03-22
14:52
Test of lepton universality in beauty-quark decays / LHCb Collaboration
The Standard Model of particle physics currently provides our best description of fundamental particles and their interactions. [...]
arXiv:2103.11769 ; LHCb-PAPER-2021-004 ; CERN-EP-2021-042 ; LHCB-PAPER-2021-004. - 2021. - 36 p.
CERN News article - LHCb News article - Interactions.org article - BBC News article - Scientific American article - Supplementary information - Fulltext - Related data file(s) - Fulltext

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2021-03-22
11:02
Search for $CP$ violation in $D_{(s)}^{+}\rightarrow h^{+}\pi^{0}$ and $D_{(s)}^{+}\rightarrow h^{+}\eta$ decays / LHCb Collaboration
Searches for $CP$ violation in the two-body decays $D_{(s)}^{+}\rightarrow h^{+}\pi^{0}$ and $D_{(s)}^{+} \rightarrow h^{+}\eta$ (where $h^{+}$ denotes a $\pi^{+}$ or $K^{+}$ meson) are performed using $pp$ collision data collected by the LHCb experiment corresponding to either 9 fb$^{-1}$ or 6 fb$^{-1}$ of integrated luminosity. [...]
arXiv:2103.11058 ; LHCb-PAPER-2021-001 ; CERN-EP-2021-036 ; LHCB-PAPER-2021-001. - 2021. - 25 p, 25 p.
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2021-03-15
11:44
Measurement of prompt-production cross-section ratio $\sigma(\chi_{c2})/\sigma(\chi_{c1})$ in $p$Pb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV / LHCb Collaboration
This Letter reports the first measurement of prompt $\chi_{c1}$ and $\chi_{c2}$ charmonium production in nuclear collisions at LHC energies. [...]
arXiv:2103.07349 ; LHCb-PAPER-2020-048 ; CERN-EP-2021-024F ; LHCB-PAPER-2020-048. - 2021. - 18 p.
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2021-03-12
14:31
Precise measurement of the $f_s/f_d$ ratio of fragmentation fractions and of $B^0_s$ decay branching fractions / LHCb Collaboration
The ratio of the $B^0_s$ and $B^0$ fragmentation fractions, $f_s/f_d$, in proton-proton collisions at the LHC, is obtained as a function of $B$-meson transverse momentum and collision centre-of-mass energy from the combined analysis of different $B$-decay channels measured by the LHCb experiment. [...]
arXiv:2103.06810 ; LHCb-PAPER-2020-046 ; CERN-EP-2021-027 ; LHCB-PAPER-2020-046. - 2021. - 33 p.
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2021-03-09
15:28
Observation of the decay $\Lambda_{b}^0\to\chi_{c1} p \pi^-$ / LHCb Collaboration
The Cabibbo-suppressed decay $\Lambda_b^0\rightarrow\chi_{c1}p\pi^-$ is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6fb$^{-1}$, collected with the LHCb detector at a centre-of-mass energy of 13TeV. [...]
arXiv:2103.04949 ; CERN-EP-2021-037 ; LHCb-PAPER-2021-003 ; LHCB-PAPER-2021-003. - 2021. - 21 p.
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2021-03-09
05:02
Forecasting performance in particle identification with potential TOF detectors at HL-LHC / Maire, Antonin (Institut Pluridisciplinaire Hubert Curien (FR))
The document addresses comparative performances expected for various configurations of Time-Of-Flight detectors, for several CERN experiments (ALICE-1, ALICE-3, ATLAS, CMS). [...]
CERN-OPEN-2021-003 ; CERN-PH-EP-2021-ANA-1073. - 2021. - 103 p.
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2021-02-05
19:42
Observation of new resonances decaying to $J/ \psi K^{+}$and $J \psi\phi$ / LHCb Collaboration
The first observation of exotic states with a new quark content ccus decaying to the $J/\psi K^{+}$ final state is reported with high significance from an amplitude analysis of the $B^{+} \to J/\psi \phi K^{+} $ decay [...]
arXiv:2103.01803 ; LHCb-PAPER-2020-044 ; CERN-EP-2021-025 ; LHCB-PAPER-2020-044. - 2021. - 18 p.
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2021-01-05
10:04
Angular analysis of the $B^{+}\rightarrow K^{\ast+}\mu^{+}\mu^{-}$ decay
We present an angular analysis of the $B^{+}\rightarrow K^{\ast+}(\rightarrow K_{S}^{0}\pi^{+})\mu^{+}\mu^{-}$ decay using 9$\,\mbox{fb}^{-1}$ of $pp$ collision data collected with the LHCb experiment. [...]
arXiv:2012.13241 ; LHCb-PAPER-2020-041 ; CERN-EP-2020-239. - 2021. - 35 p.
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2021-01-04
13:37
Evidence of a $J/\psi \varLambda$ structure and observation of excited $\varXi^-$ states in the $\varXi_b^-\to J/\psi \varLambda K^-$ decay / LHCb Collaboration
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. [...]
arXiv:2012.10380 ; LHCb-PAPER-2020-039 ; CERN-EP-2020-233. - 2021. - 20 p.
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