Search results for: S. Stracka

Items from 1 to 20 out of 209 results

article

Search for the doubly charmed baryon $$\Xi_{cc}^+$$ Ξ c c +

LHCb Collaboration, R. Aaij, C. Abellán Beteta, T. Ackernley, more

Science China Physics, Mechanics & Astronomy > 2020 > 63 > 2 > 1-15

A search for the doubly charmed baryon $$\Xi_{cc}^+$$ Ξ c c + is performed through its decay to the $$\Lambda_c^ + {K^ -}{\pi ^ +}$$ Λ c + K − π + final state, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV. The data correspond to a total integrated luminosity of 9 fb⁻¹. No significant signal is observed in...

article

A search for Ξ cc + + $$ {\Xi}_{\mathrm{cc}}^{++} $$ → D⁺pK⁻π⁺ decays

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 10 > 1-21

Abstract A search for the Ξ cc + + $$ {\Xi}_{cc}^{++} $$ baryon through the Ξ cc + + $$ {\Xi}_{cc}^{++} $$ → D⁺pK⁻π⁺ decay is performed with a data sample corresponding to an integrated luminosity of 1.7 fb⁻¹ recorded by the LHCb experiment in pp collisions at a centre-of-mass energy of 13 TeV. No significant signal is observed in the mass range from the kinematic threshold of...

article

Measurements of CP asymmetries in charmless four-body $${\varLambda } ^0_{b} $$ Λb0 and $${\varXi } ^0_{b} $$ Ξb0 decays

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, more

The European Physical Journal C > 2019 > 79 > 9 > 1-19

A search for $$C\!P$$ CP violation in charmless four-body decays of $${\varLambda } ^0_{b} $$ Λb0 and $${\varXi } ^0_{b} $$ Ξb0 baryons with a proton and three charged mesons in the final state is performed. To cancel out production and detection charge-asymmetry effects, the search is carried out by measuring the difference between the $$C\!P$$ CP asymmetries in a charmless decay and in a decay...

article

Observation of the Λ b 0 → χ c 1 $$ {\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1} $$ (3872) pK⁻ decay

The LHCb collaboration, R. Aaij, C. Abellán Beteta, T. Ackernley, more

Journal of High Energy Physics > 2019 > 2019 > 9 > 1-20

Abstract Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb⁻¹ of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λ b 0 → χ c 1 $$ {\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1} $$ (3872)pK⁻ with χ_c1(3872) → J/ψ π⁺π⁻ is observed for the first time. The significance of the observed...

article

Updated measurement of time-dependent $$CP$$ CP -violating observables in $${{B} ^0_{s}} \rightarrow J/\psi K^+ K^-$$ Bs0→J/ψK+K- decays

R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva, more

The European Physical Journal C > 2019 > 79 > 8 > 1-26

The decay-time-dependent $$CP$$ CP asymmetry in $${{B} ^0_{s}} \rightarrow J/\psi {{K} ^+} {{K} ^-} $$ Bs0→J/ψK+K- decays is measured using proton–proton collision data, corresponding to an integrated luminosity of $$1.9\,\mathrm{fb}^{-1} $$ 1.9fb-1 , collected with the LHCb detector at a centre-of-mass energy of $$13\,\mathrm {TeV}$$ 13TeV in 2015 and 2016. Using a sample of approximately 117 000...

article

Search for the rare decay $${{{B} ^+}} \!\rightarrow {\mu ^+} {\mu ^-} {\mu ^+} {{\upnu } _\mu } $$ B+→μ+μ-μ+νμ

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, more

The European Physical Journal C > 2019 > 79 > 8 > 1-12

A search for the rare leptonic decay $${{{B} ^+}} \!\rightarrow {\mu ^+} {\mu ^-} {\mu ^+} {{\upnu } _\mu } $$ B+→μ+μ-μ+νμ is performed using proton-proton collision data corresponding to an integrated luminosity of $$4.7 \, {\hbox {fb}}^{-1}$$ 4.7fb-1 collected by the LHCb experiment. The search is carried out in the region where the lowest of the two $${\mu ^+\mu ^-} $$ μ+μ- mass combinations...

article

Measurement of CP observables in the process B⁰ → DK^*0 with two- and four-body D decays

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 8 > 1-30

Abstract Measurements of CP observables in B⁰ → DK^∗0 decays are presented, where D represents a superposition of D⁰ and D ¯ 0 $$ {\overline{D}}^0 $$ states. The D meson is reconstructed in the two-body final states K⁺π⁻, π⁺K⁻, K⁺K⁻ and π⁺π⁻, and, for the first time, in the fourbody final states K⁺π⁻π⁺π⁻, π⁺K⁻π⁺π⁻ and π⁺π⁻π⁺π⁻. The analysis uses a sample of neutral B mesons produced in proton-proton...

article

Near-threshold D D ¯ $$ \mathrm{D}\overline{\mathrm{D}} $$ spectroscopy and observation of a new charmonium state

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 7 > 1-23

Abstract Using proton-proton collision data, corresponding to an integrated luminosity of 9 fb⁻¹, collected with the LHCb detector between 2011 and 2018, a new narrow charmonium state, the X(3842) resonance, is observed in the decay modes X 3842 → D 0 D ¯ 0 $$ \mathrm{X}(3842)\to {D}^0{\overline{D}}^0 $$ and X(3842) → D⁺D⁻. The mass and the natural width of this state are measured to...

article

Amplitude analysis of the B s 0 → K ∗ 0 K ¯ ∗ 0 $$ {B}_{(s)}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$ decays and measurement of the branching fraction of the B 0 → K ∗ 0 K ¯ ∗ 0 $$ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$ decay

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 7 > 1-31

Abstract The B 0 → K ∗ 0 K ¯ ∗ 0 $$ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$ and B s 0 → K ∗ 0 K ¯ ∗ 0 $$ {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$ decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3 fb⁻¹. An untagged and timeintegrated amplitude analysis of B_(s)⁰ → (K⁺π⁻)(K⁻π⁺) decays in two-body...

article

Measurement of the branching fraction and $$C\!P$$ CP asymmetry in $${{{B} ^+}} \!\rightarrow {{J /\psi }} {{\rho } ^+} $$ B+→J/ψρ+ decays

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, more

The European Physical Journal C > 2019 > 79 > 6 > 1-13

The branching fraction and direct $$C\!P$$ CP asymmetry of the decay $${{{B} ^+}} \!\rightarrow {{J /\psi }} {{\rho } ^+} $$ B+→J/ψρ+ 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$$\,\text{ fb }^{-1}$$ fb-1 . The following results are obtained: $$\begin{aligned} \mathcal...

article

Amplitude analysis of B_s⁰ → K_S⁰K^±π^∓ decays

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 6 > 1-28

Abstract The first untagged decay-time-integrated amplitude analysis of B_s⁰ → K_S⁰K^±π^∓ decays is performed using a sample corresponding to 3.0 fb⁻¹ of pp collision data recorded with the LHCb detector during 2011 and 2012. The data are described with an amplitude model that contains contributions from the intermediate resonances K^*(892)^0,+, K₂^* (1430)^0,+ and K₀^* (1430)^0,+, and their charge conjugates...

article

Erratum to: Measurement of ϒ production in pp collisions at s $$ \sqrt{\mathrm{s}} $$ = 13 TeV

The LHCb collaboration, R. Aaij, B. Adeva, M. Adinolfi, more

Journal of High Energy Physics > 2019 > 2019 > 5 > 1-7

The top plot shown in figure 3 of ref. [1] is the result of 8 TeV.

article

Study of the B⁰ → ρ(770)°K^*(892)⁰ decay with an amplitude analysis of B⁰ → (π⁺π⁻)(K⁺π⁻) decays

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 5 > 1-31

Abstract An amplitude analysis of B⁰ → (π⁺π⁻)(K⁺π⁻) decays is performed in the two-body invariant mass regions 300 < m(π⁺π⁻) < 1100 MeV/c², accounting for the ρ⁰, ω, f₀(500), f₀(980) and f₀(1370) resonances, and 750 < m(K⁺π⁻) < 1200 MeV/c², which is dominated by the K^*(892)⁰ meson. The analysis uses 3 fb⁻¹ of proton-proton collision data collected by the LHCb experiment at centre-of-mass...

article

Observation of the doubly Cabibbo-suppressed decay Ξ_c⁺ → pϕ

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 4 > 1-18

Abstract The doubly Cabibbo-suppressed decay Ξ_c⁺ → pϕ with ϕ → K⁺K⁻ is observed for the first time, with a statistical significance of more than fifteen standard deviations. The data sample used in this analysis corresponds to an integrated luminosity of 2 fb⁻¹ recorded with the LHCb detector in pp collisions at a centre-of-mass energy of 8 TeV. The ratio of branching fractions between the decay...

article

Dalitz plot analysis of the D⁺ → K⁻K⁺K⁺ decay

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 4 > 1-36

Abstract The resonant structure of the doubly Cabibbo-suppressed decay D⁺→K⁻K⁺K⁺ is studied for the first time. The measurement is based on a sample of pp-collision data, collected at a centre-of-mass energy of 8 TeV with the LHCb detector and corresponding to an integrated luminosity of 2 fb⁻¹. The amplitude analysis of this decay is performed with the isobar model and a phenomenological model based...

article

Measurement of the branching fractions of the decays D⁺ → K⁻K⁺K⁺, D⁺ → π⁻π⁺K⁺ and D_s⁺ → π⁻K⁺K⁺

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 3 > 1-24

Abstract The branching fractions of the doubly Cabibbo-suppressed decays D⁺ → K⁻K⁺K⁺, D⁺ → π⁻π⁺K⁺ and D_s⁺ → π⁻K⁺K⁺ are measured using the decays D⁺ → K⁻π⁺π⁺ and D_s⁺ → K⁻K⁺π⁺ as normalisation channels. The measurements are performed using proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2.0 fb⁻¹. The results...

article

Measurement of the ratio of branching fractions of the decays Λ _b⁰ → ψ(2S)Λ and Λ _b⁰ → J/ψΛ

The LHCb collaboration, R. Aaij, B. Adeva, M. Adinolfi, more

Journal of High Energy Physics > 2019 > 2019 > 3 > 1-16

Abstract Using pp collisions corresponding to 3 fb⁻¹ integrated luminosity, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, the ratio of branching fractions ℬ Λ b 0 → ψ 2 S Λ / ℬ Λ b 0 → J / ψ Λ = 0.513 ± 0.023 stat ± 0.016 syst ± 0.011 ℬ $$ \mathrm{\mathcal{B}}\left({\Lambda}_b^0\to \psi (2S)\Lambda \right)/\mathrm{\mathcal{B}}\left({\Lambda}_b^0\to...

article

Search for CP violation through an amplitude analysis of D⁰ → K⁺K⁻π⁺π⁻ decays

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, more

Journal of High Energy Physics > 2019 > 2019 > 2 > 1-34

Abstract A search for CP violation in the Cabibbo-suppressed D⁰ → K⁺K⁻π⁺π⁻ decay mode is performed using an amplitude analysis. The measurement uses a sample of pp collisions recorded by the LHCb experiment during 2011 and 2012, corresponding to an integrated luminosity of 3.0 fb⁻¹. The D⁰ mesons are reconstructed from semileptonic b-hadron decays into D⁰μ⁻X final states. The selected sample contains...

article

Prompt Λ _c⁺ production in pPb collisions at s N N = 5.02 $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ TeV

The LHCb collaboration, R. Aaij, B. Adeva, M. Adinolfi, more

Journal of High Energy Physics > 2019 > 2019 > 2 > 1-26

Abstract The prompt production of Λ _c⁺ baryons is studied in proton-lead collisions collected with the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of 1.58 nb⁻¹ recorded at a nucleon-nucleon centre-of-mass energy of s N N = 5.02 $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ TeV. Measurements of the differential cross-section and the forwardbackward production...

article

Evidence for an $$\eta _c(1S) \pi ^-$$ ηc(1S)π- resonance in $$B^0 \rightarrow \eta _c(1S) K^+\pi ^-$$ B0→ηc(1S)K+π- decays

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, more

The European Physical Journal C > 2018 > 78 > 12 > 1-23

A Dalitz plot analysis of $${{B} ^0} \!\rightarrow \eta _c(1S) {{K} ^+} {{\pi } ^-} $$ B0→ηc(1S)K+π- decays is performed using data samples of pp collisions collected with the $$\text{ LHCb } $$ LHCb detector at centre-of-mass energies of $${\sqrt{s}} =7,~8$$ s=7,8 and $$13{\,\mathrm {Te}\mathrm {V}} $$ 13TeV , corresponding to a total integrated luminosity of $$4.7 \,\text{ fb }^{-1} $$ 4.7fb-1...

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INFONA - science communication portal

Search results for: S. Stracka

Search for the doubly charmed baryon $$\Xi_{cc}^+$$ Ξ c c +

A search for Ξ cc + + $$ {\Xi}_{\mathrm{cc}}^{++} $$ → D⁺pK⁻π⁺ decays

Measurements of CP asymmetries in charmless four-body $${\varLambda } ^0_{b} $$ Λb0 and $${\varXi } ^0_{b} $$ Ξb0 decays

Observation of the Λ b 0 → χ c 1 $$ {\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1} $$ (3872) pK⁻ decay

Updated measurement of time-dependent $$CP$$ CP -violating observables in $${{B} ^0_{s}} \rightarrow J/\psi K^+ K^-$$ Bs0→J/ψK+K- decays

Search for the rare decay $${{{B} ^+}} \!\rightarrow {\mu ^+} {\mu ^-} {\mu ^+} {{\upnu } _\mu } $$ B+→μ+μ-μ+νμ

Measurement of CP observables in the process B⁰ → DK^*0 with two- and four-body D decays

Near-threshold D D ¯ $$ \mathrm{D}\overline{\mathrm{D}} $$ spectroscopy and observation of a new charmonium state

Amplitude analysis of the B s 0 → K ∗ 0 K ¯ ∗ 0 $$ {B}_{(s)}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$ decays and measurement of the branching fraction of the B 0 → K ∗ 0 K ¯ ∗ 0 $$ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$ decay

Measurement of the branching fraction and $$C\!P$$ CP asymmetry in $${{{B} ^+}} \!\rightarrow {{J /\psi }} {{\rho } ^+} $$ B+→J/ψρ+ decays

Amplitude analysis of B_s⁰ → K_S⁰K^±π^∓ decays

Erratum to: Measurement of ϒ production in pp collisions at s $$ \sqrt{\mathrm{s}} $$ = 13 TeV

Study of the B⁰ → ρ(770)°K^*(892)⁰ decay with an amplitude analysis of B⁰ → (π⁺π⁻)(K⁺π⁻) decays

Observation of the doubly Cabibbo-suppressed decay Ξ_c⁺ → pϕ

Dalitz plot analysis of the D⁺ → K⁻K⁺K⁺ decay

Measurement of the branching fractions of the decays D⁺ → K⁻K⁺K⁺, D⁺ → π⁻π⁺K⁺ and D_s⁺ → π⁻K⁺K⁺

Measurement of the ratio of branching fractions of the decays Λ _b⁰ → ψ(2S)Λ and Λ _b⁰ → J/ψΛ

Search for CP violation through an amplitude analysis of D⁰ → K⁺K⁻π⁺π⁻ decays

Prompt Λ _c⁺ production in pPb collisions at s N N = 5.02 $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ TeV

Evidence for an $$\eta _c(1S) \pi ^-$$ ηc(1S)π- resonance in $$B^0 \rightarrow \eta _c(1S) K^+\pi ^-$$ B0→ηc(1S)K+π- decays

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