Publications
1177 results found
Aaij R, Beteta CA, Adeva B, et al., 2020, Measurement of vertical bar V-cb vertical bar with B-s(0) -> D-s(()*()-) mu(+)nu(mu) decays, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 101, Pages: 072004-1-072004-25, ISSN: 1550-2368
The element |Vcb| of the Cabibbo-Kobayashi-Maskawa matrix is measured using semileptonic B0s decays produced in proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. Rates of B0s→D−sμ+νμ and B0s→D*−sμ+νμ decays are analyzed using hadronic form-factor parametrizations derived either by Caprini, Lellouch and Neubert (CLN) or by Boyd, Grinstein and Lebed (BGL). The measured values of |Vcb| are (41.4±0.6±0.9±1.2)×10−3 and (42.3±0.8±0.9±1.2)×10−3 in the CLN and BGL parametrization, respectively. The first uncertainty is statistical, the second systematic, and the third is due to the external inputs used in the measurement. These results are in agreement with those obtained from decays of B+ and B0 mesons. They are the first determinations of |Vcb| at a hadron-collider experiment and the first using B0s meson decays.
Aaij R, Beteta CA, Ackernley T, et al., 2020, Measurement of, Physical Review D, Vol: 101, ISSN: 2470-0010
The element |Vcb| of the Cabibbo-Kobayashi-Maskawa matrix is measured using semileptonic Bs0 decays produced in proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. Rates of Bs0→Ds-μ+νμ and Bs0→Ds∗-μ+νμ decays are analyzed using hadronic form-factor parametrizations derived either by Caprini, Lellouch and Neubert (CLN) or by Boyd, Grinstein and Lebed (BGL). The measured values of |Vcb| are (41.4±0.6±0.9±1.2)×10-3 and (42.3±0.8±0.9±1.2)×10-3 in the CLN and BGL parametrization, respectively. The first uncertainty is statistical, the second systematic, and the third is due to the external inputs used in the measurement. These results are in agreement with those obtained from decays of B+ and B0 mesons. They are the first determinations of |Vcb| at a hadron-collider experiment and the first using Bs0 meson decays.
Aaij R, Beteta CA, Adeva B, et al., 2020, Measurement off f(s)/f(u) variation with proton-proton collision energy and B-meson kinematics, Physical Review Letters, Vol: 124, Pages: 122002-1-122002-11, ISSN: 0031-9007
The ratio of the B0s and B+ fragmentation fractions fs and fu is studied with B0s→J/ψϕ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio fs/fu is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of fs/fu as a function of collision energy.
Aaij R, Abellán Beteta C, Ackernley T, et al., 2020, Observation of the semileptonic decay B+→pp¯¯¯μ+νμ, The Journal of High Energy Physics, Vol: 2020, Pages: 1-22, ISSN: 1029-8479
Aaij R, Beteta CA, Ackernley T, et al., 2020, Observation of the semileptonic decay B+-> p(p)over-bar mu(+)nu(mu), The Journal of High Energy Physics, Vol: 2020, Pages: 1-22, ISSN: 1029-8479
The Cabibbo-suppressed semileptonic decay B+→pp¯¯¯μ+νμ is observed for the first time using a sample of pp collisions corresponding to an integrated luminosity of 1.0, 2.0 and 1.7 fb−1 at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The differential branching fraction is measured as a function of the pp¯¯¯ invariant mass using the decay mode B+→ J/ψK+ for normalisation. The total branching fraction is measured to beB(B+→pp¯¯¯μ+νμ)=(5.27+0.23−0.24±0.21±0.15)×10−6,where the first uncertainty is statistical, the second systematic and the third is from the uncertainty on the branching fraction of the normalisation channel.
Aaij R, Beteta CA, Ackernley T, et al., 2020, Isospin amplitudes in lambda(0)(b) -> J/psi lambda (Sigma(0)) and Xi(0)(b)-> J/psi Xi(0) (Lambda) decays, Physical Review Letters, Vol: 124, Pages: 111802-1-111802-11, ISSN: 0031-9007
Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb−1, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A1(Λ0b→J/ψΣ0)/A0(Λ0b→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95% confidence level. The Cabibbo suppressed Ξ0b→J/ψΛ decay is observed for the first time, allowing for the measurement |A0(Ξ0b→J/ψΛ)/A1/2(Ξ0b→J/ψΞ0)|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.
Aaij R, Beteta CA, Ackernley T, et al., 2020, Measurement of the η<i><sub>c</sub></i>(1S) production cross-section in <i>p p</i> collisions at √<i>s</i>=13TeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 80, ISSN: 1434-6044
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- Citations: 14
Aaij R, Beteta CA, Ackernley T, et al., 2020, Measurement of the ηc(1S) production cross-section in p p collisions at s√=13 TeV, The European Physical Journal C, Vol: 80, Pages: 1-18, ISSN: 1434-6044
Using a data sample corresponding to an integrated luminosity of 2.0 fb−1, collected by the LHCb experiment, the production of the ηc(1S) state in proton–proton collisions at a centre-of-mass energy of s√=13 TeV is studied in the rapidity range 2.0<y<4.5 and in the transverse momentum range 6.5<pT<14.0GeV. The cross-section for prompt production of ηc(1S) mesons relative to that of the J/ψ meson is measured using the p p¯¯¯ decay mode and is found to be σηc(1S)/σJ/ψ=1.69±0.15±0.10±0.18. The quoted uncertainties are, in order, statistical, systematic and due to uncertainties on the branching fractions of the J/ψ→pp¯¯¯ and ηc→pp¯¯¯ decays. The prompt ηc(1S) production cross-section is determined to be σηc(1S)=1.26±0.11±0.08±0.14μb, where the last uncertainty includes that on the J/ψ meson cross-section. The ratio of the branching fractions of b-hadron decays to the ηc(1S) and J/ψ states is measured to be Bb→ηcX/Bb→J/ψX=0.48±0.03±0.03±0.05, where the last uncertainty is due to those on the branching fractions of the J/ψ→pp¯¯¯ and ηc→pp¯¯¯ decays. The difference between the J/ψ and ηc(1S) masses is also determined to be 113.0±0.7±0.1MeV, which is the most precise single measurement of this quantity to date.
Aaij R, Beteta CA, Adeva B, et al., 2020, Measurement of psi (2S) production cross-sections in proton-proton collisions at v s=7 and 13 TeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 80, ISSN: 1434-6044
Aaij R, Beteta CA, Adeva B, et al., 2020, First observation of excited omega(-)(b) states, Physical Review Letters, Vol: 124, Pages: 082002-1-082002-12, ISSN: 0031-9007
We report four narrow peaks in the Ξ0bK− mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb−1 recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[Ωb(6316)−]=6315.64±0.31±0.07±0.50 MeV, m[Ωb(6330)−]=6330.30±0.28±0.07±0.50 MeV, m[Ωb(6340)−]=6339.71±0.26±0.05±0.50 MeV, m[Ωb(6350)−]=6349.88±0.35±0.05±0.50 MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the Ξ0b mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be Γ[Ωb(6316)−]<2.8 MeV, Γ[Ωb(6330)−]<3.1 MeV and Γ[Ωb(6340)−]<1.5 MeV. The natural width of the Ωb(6350)− peak is 1.4+1.0−0.8±0.1 MeV, which is 2.5σ from zero and corresponds to an upper limit of 2.8 MeV. The peaks have local significances ranging from 3.6σ to 7.2σ. After accounting for the look-elsewhere effect, the significances of the Ωb(6316)− and Ωb(6330)− peaks are reduced to 2.1σ and 2.6σ, respectively, while the two higher mass peaks exceed 5σ. The observed peaks are consistent with expectations for excited Ω−b resonances.
Aaij R, Beteta CA, Adeva B, et al., 2020, Determination of quantum numbers for several excited charmed mesons observed in B- -> D*(+)pi(-) pi(-) decays, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 101, Pages: 032005-1-032005-24, ISSN: 1550-2368
A four-body amplitude analysis of the B−→D*+π−π− decay is performed, where fractions and relative phases of the various resonances contributing to the decay are measured. Several quasi-model-independent analyses are performed aimed at searching for the presence of new states and establishing the quantum numbers of previously observed charmed meson resonances. In particular the resonance parameters and quantum numbers are determined for the D1(2420), D1(2430), D0(2550), D∗1(2600), D2(2740) and D∗3(2750) states. The mixing between the D1(2420) and D1(2430) resonances is studied and the mixing parameters are measured. The dataset corresponds to an integrated luminosity of 4.7 fb−1, collected in proton-proton collisions at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector.
Aaij R, Abellán Beteta C, Adeva B, et al., 2020, Erratum to: Study of ϒ production in pPb collisions at root sNN= 8.16 TeV, The Journal of High Energy Physics, Vol: 2020, Pages: 1-8, ISSN: 1029-8479
Aaij R, Abellan Beteta C, Ackernley T, et al., 2020, Precision measurement of the Xi(++)(cc) mass, The Journal of High Energy Physics, Vol: 2020, ISSN: 1029-8479
A measurement of the Ξ++cc mass is performed using data collected by the LHCb experiment between 2016 and 2018 in pp collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 fb−1. The Ξ++cc candidates are reconstructed via the decay modes Ξ++cc→Λ+cK−π+π+ and Ξ++cc→Ξ+cπ+. The result, 3621.55 ± 0.23 (stat) ± 0.30 (syst) MeV/c2, is the most precise measurement of the Ξ++cc mass to date.
Aaij R, Beteta CA, Ackernley T, et al., 2020, Measurement of Xi(++)(cc) production in pp collisions at root s=13 TeV, Chinese Physics C, Vol: 44, Pages: 1-11, ISSN: 0254-3052
The production of $\varXi _{cc}^ {++}$ baryons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13\;{\rm{TeV}}$ is measured in the transverse-momentum range $4 \lt p_{\rm{T}} \lt 15\;{\rm{GeV}}/c$ and the rapidity range $2.0 \lt y \lt 4.5$. The data used in this measurement correspond to an integrated luminosity of $1.7\;{\rm{fb}}^{-1}$, recorded by the LHCb experiment during 2016. The ratio of the $\varXi _{cc}^ {++}$ production cross-section times the branching fraction of the $\varXi _{cc}^ {++} \to \varLambda _c^ + K^-\pi^+ \pi^+$ decay relative to the prompt $\varLambda _c^ + $ production cross-section is found to be $(2.22\pm 0.27 \pm 0.29)\times 10^{-4}$, assuming the central value of the measured $\varXi _{cc}^ {++}$ lifetime, where the first uncertainty is statistical and the second systematic.
Aaij R, Abellán Beteta C, Ackernley T, et al., 2020, Search for A^{'}→μ^{+}μ^{-} Decays., Physical Review Letters, Vol: 124, Pages: 041801-1-041801-12, ISSN: 0031-9007
Searches are performed for both promptlike and long-lived dark photons, A^{'}, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for A^{'}→μ^{+}μ^{-} decays using a data sample corresponding to an integrated luminosity of 5.5 fb^{-1} collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the γ-A^{'} kinetic mixing strength. The promptlike A^{'} search explores the mass region from near the dimuon threshold up to 70 GeV and places the most stringent constraints to date on dark photons with 214<m(A^{'})≲740 MeV and 10.6<m(A^{'})≲30 GeV. The search for long-lived A^{'}→μ^{+}μ^{-} decays places world-leading constraints on low-mass dark photons with lifetimes O(1) ps.
Aaij R, Beteta CA, Ackernley T, et al., 2020, Search for A ' -> mu(+)mu(-) decays, Physical Review Letters, Vol: 124, Pages: 041801-1-041801-12, ISSN: 0031-9007
Searches are performed for both promptlike and long-lived dark photons, A′, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for A′→μ+μ− decays using a data sample corresponding to an integrated luminosity of 5.5 fb−1 collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the γ–A′ kinetic mixing strength. The promptlike A′ search explores the mass region from near the dimuon threshold up to 70 GeV and places the most stringent constraints to date on dark photons with 214<m(A′)≲740 MeV and 10.6<m(A′)≲30 GeV. The search for long-lived A′→μ+μ− decays places world-leading constraints on low-mass dark photons with lifetimes O(1) ps.
Aaij R, Beteta CA, Adeva B, et al., 2020, Measurement of psi(2S) meson production in pp collisions at root s = 7TeV (vol 72, 2100, 2012), European Physical Journal C: Particles and Fields, Vol: 80, Pages: 1-7, ISSN: 1124-1861
Aaij R, Abellán Beteta C, Adeva B, et al., 2020, Amplitude analysis of the B+→π+π+π− decay, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 101, Pages: 012006-1-012006-46, ISSN: 1550-2368
The results of an amplitude analysis of the charmless three-body decay B+→π+π+π−, in which CP-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of 3 fb−1 of pp collisions recorded with the LHCb detector. The most challenging aspect of the analysis is the description of the behavior of the π+π− S-wave contribution, which is achieved by using three complementary approaches based on the isobar model, the K-matrix formalism, and a quasi-model-independent procedure. Additional resonant contributions for all three methods are described using a common isobar model, and include the ρ(770)0, ω(782) and ρ(1450)0 resonances in the π+π− P-wave, the f2(1270) resonance in the π+π− D-wave, and the ρ3(1690)0 resonance in the π+π− F-wave. Significant CP-violation effects are observed in both S- and D-waves, as well as in the interference between the S- and P-waves. The results from all three approaches agree and provide new insight into the dynamics and the origin of CP-violation effects in B+→π+π+π− decays.
Aaij R, Beteta CA, Adeva B, et al., 2020, Amplitude analysis of the B+ -> pi(+)pi(+)pi(-) decay, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 101, Pages: 012006-1-012006-46, ISSN: 1550-2368
The results of an amplitude analysis of the charmless three-body decay B+→π+π+π−, in which CP-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of 3 fb−1 of pp collisions recorded with the LHCb detector. The most challenging aspect of the analysis is the description of the behavior of the π+π− S-wave contribution, which is achieved by using three complementary approaches based on the isobar model, the K-matrix formalism, and a quasi-model-independent procedure. Additional resonant contributions for all three methods are described using a common isobar model, and include the ρ(770)0, ω(782) and ρ(1450)0 resonances in the π+π− P-wave, the f2(1270) resonance in the π+π− D-wave, and the ρ3(1690)0 resonance in the π+π− F-wave. Significant CP-violation effects are observed in both S- and D-waves, as well as in the interference between the S- and P-waves. The results from all three approaches agree and provide new insight into the dynamics and the origin of CP-violation effects in B+→π+π+π− decays.
Aaij R, Beteta CA, Adeva B, et al., 2020, Updated measurement of decay-time-dependent <i>CP</i> asymmetries in <i>D</i><SUP>0</SUP> → <i>K</i><SUP>+</SUP> <i>K</i><SUP>-</SUP> and <i>D</i><SUP>0</SUP> → π<SUP>+</SUP>π<SUP>-</SUP> decays, Publisher: AMER PHYSICAL SOC
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- Citations: 9
Aaij R, Beteta CA, Adeva B, et al., 2020, Search for the doubly charmed baryon Xi(+)(cc), SCIENCE CHINA Physics, Mechanics and Astronomy, Vol: 63, ISSN: 1674-7348
A search for the doubly charmed baryon Ξ+cc is performed through its decay to the Λ+cK−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 the mass range from 3.4 to 3.8 GeV/c2. Upper limits are set at 95% credibility level on the ratio of the Ξ+cc production cross-section times the branching fraction to that of Λ+c and Ξ++cc baryons. The limits are determined as functions of the Ξ+cc mass for different lifetime hypotheses, in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 4 to 15 GeV/c.
Aaij R, Beteta CA, Adeva B, et al., 2019, Measurement of CP violation in the B-s(0)-> phi phi decay and search for the B-0 -> phi phi decay, The Journal of High Energy Physics, Vol: 2019, Pages: 1-34, ISSN: 1029-8479
A measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0 fb−1 collected by the LHCb experiment at centre-of-mass energies s√ = 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 B0s→ϕϕ decays is obtained. The CP-violating phase ϕss¯¯¯ss is measured to be −0.073 ± 0.115(stat) ± 0.027(syst) rad, under the assumption it is independent of the helicity of the ϕϕ decay. In addition, the CP-violating phases of the transverse polarisations under the assumption of CP conservation of the longitudinal phase are measured. The helicity-independent direct CP-violation parameter is also measured, and is found to be |λ| = 0.99 ± 0.05(stat) ± 0.01(syst). In addition, T-odd triple-product asymmetries are measured. The results obtained are consistent with the hypothesis of CP conservation in b¯¯→s¯¯¯ss¯¯¯s transitions. Finally, a limit on the branching fraction of the B0 → ϕϕ decay is determined to be B(B0→ϕϕ)<2.7×10−8 at 90 % confidence level.
Aaij R, Beteta CA, Adeva B, et al., 2019, Measurement of the <i>B<sub>c</sub></i><SUP>-</SUP> meson production fraction and asymmetry in 7 and 13 TeV <i>pp</i> collisions, Publisher: AMER PHYSICAL SOC
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- Citations: 13
Aaij R, Beteta CA, Adeva B, et al., 2019, Search for Lepton-Flavor Violating Decays <i>B</i><SUP>+</SUP> → <i>K</i><SUP>+</SUP> μ<SUP>±</SUP> <i>e</i><SUP>∓</SUP>, PHYSICAL REVIEW LETTERS, Vol: 123, ISSN: 0031-9007
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- Citations: 13
Aaij R, Abellán Beteta C, Ackernley T, et al., 2019, Search for lepton-flavor violating decays B+→K+μ±e∓, Physical Review Letters, Vol: 123, Pages: 241802-1-241802-11, ISSN: 0031-9007
A search for the lepton-flavor violating decays B+→K+μ±e∓ is performed using a sample of proton-proton collision data, collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of 3 fb−1. No significant signal is observed, and upper limits on the branching fractions are set as B(B+→K+μ−e+)<7.0(9.5)×10−9 and B(B+→K+μ+e−)<6.4(8.8)×10−9 at 90% (95)% confidence level. The results improve the current best limits on these decays by more than one order of magnitude.
Aaij R, Beteta CA, Adeva B, et al., 2019, Amplitude Analysis of <i>B</i><SUP>±</SUP> → π<SUP>±</SUP><i>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP> Decays, PHYSICAL REVIEW LETTERS, Vol: 123, ISSN: 0031-9007
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- Citations: 35
Aaij R, Abellán Beteta C, Adeva B, et al., 2019, Amplitude analysis of B^{±}→π^{±}K^{+}K^{-} decays., Physical Review Letters, Vol: 123, Pages: 231802-231802, ISSN: 0031-9007
The first amplitude analysis of the B^{±}→π^{±}K^{+}K^{-} decay is reported based on a data sample corresponding to an integrated luminosity of 3.0 fb^{-1} of pp collisions recorded in 2011 and 2012 with the LHCb detector. The data are found to be best described by a coherent sum of five resonant structures plus a nonresonant component and a contribution from ππ↔KK S-wave rescattering. The dominant contributions in the π^{±} K^{∓} and K^{+} K^{-} systems are the nonresonant and the B^{±}→ρ(1450)^{0}π^{±} amplitudes, respectively, with fit fractions around 30%. For the rescattering contribution, a sizable fit fraction is observed. This component has the largest CP asymmetry reported to date for a single amplitude of (-66±4±2)%, where the first uncertainty is statistical and the second systematic. No significant CP violation is observed in the other contributions.
Aaij R, Beteta CA, Adeva B, et al., 2019, Measurement of charged hadron production in Z-tagged jets in proton-Proton collisions at root s=8 TeV, Physical Review Letters, Vol: 123, Pages: 232001-1-232001-11, ISSN: 0031-9007
The production of charged hadrons within jets recoiling against a Z boson is measured in proton-proton collision data at √s=8 TeV recorded by the LHCb experiment. The charged-hadron structure of the jet is studied longitudinally and transverse to the jet axis for jets with transverse momentum pT>20 GeV and in the pseudorapidity range 2.5<η<4. These are the first measurements of jet hadronization at these forward rapidities and also the first where the jet is produced in association with a Z boson. In contrast to previous hadronization measurements at the Large Hadron Collider, which are dominated by gluon jets, these measurements probe predominantly light-quark jets which are found to be more longitudinally and transversely collimated with respect to the jet axis when compared to the previous gluon dominated measurements. Therefore, these results provide valuable information on differences between quarks and gluons regarding nonperturbative hadronization dynamics.
Poulsen C, Egede U, Robbins D, et al., 2019, Evaluation and comparison of a machine learning cloud identification algorithm for the SLSTR in polar regions
Albrecht J, Alves AA, Amadio G, et al., 2019, A Roadmap for HEP Software and Computing R&D for the 2020s, Computing and Software for Big Science, Vol: 3
Particle physics has an ambitious and broad experimental programme for the coming decades. This programme requires large investments in detector hardware, either to build new facilities and experiments, or to upgrade existing ones. Similarly, it requires commensurate investment in the R&D of software to acquire, manage, process, and analyse the shear amounts of data to be recorded. In planning for the HL-LHC in particular, it is critical that all of the collaborating stakeholders agree on the software goals and priorities, and that the efforts complement each other. In this spirit, this white paper describes the R&D activities required to prepare for this software upgrade.
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