Visualitzant La Salle per matèria "Col·lisions (Física nuclear)"
Ara mostrant els elements 141-160 de 219
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Observation of associated production of a Z boson with a D meson in the forward region
(Journal of High Energy Physics, 2014, Vol. 2014, No.4 (Abril), 2014-04-14)A search for associated production of a Z boson with an open charm meson is presented using a data sample, corresponding to an integrated luminosity of 1.0 fb−1 of proton-proton collisions at a ... -
Observation of B(s)(0) → J/ψf(2)'(1525) in J/ψK+ K- final states
(Physical Review Letters, 2012, Vol. 108, No. 15 (Abril), 2012-04-09)The decay ¯¯¯B0s→J/ψK+K− is investigated using 0.16 fb−1 of data collected with the LHCb detector using 7 TeV pp collisions. Although the J/ψϕ channel is well known, final states at higher K+K− masses ... -
Observation of B0 s→K 7 K ∓ and evidence for B0 s→K − π + decays
(New Journal of Physics, 2014, Vol. 16, 2014-12)Measurements of the branching fractions of → ± ∓ B KK * s 0 and → π± ∓ B K* s 0 decays are performed using a data sample corresponding to − 1.0 fb 1 of protonproton collision data collected with the ... -
Observation of B0s –B¯¯¯¯0s mixing and measurement of mixing frequencies using semileptonic B decays
(The European Physical Journal C, 2013, Vol. 73, no. 12 (Desembre), 2013-12-04)The B0s and B 0 mixing frequencies, Δm s and Δm d , are measured using a data sample corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in pp collisions at a centre ... -
Observation of B0s→χc1φ decay and study of B0→χ c1,2K∗0 decays
(Nuclear Physics B, 2013, Vol. 874, No. 3, 2013-09)The first observation of the decay B0s→χc1φ and a study of B0→χc1,2K∗0 decays are presented. The analysis is performed using a dataset, corresponding to an integrated luminosity of 1.0 fb−1, collected ... -
Observation of B0→¯¯¯D0K+K− and Evidence for B0s→¯¯¯D0K+K−
(Physical Review Letters, 2012, Vol. 109, No. 13 (Setembre), 2012-09-26)The first observation of the decay B0→¯¯¯D0K+K− is reported from an analysis of 0.62 fb−1 of pp collision data collected with the LHCb detector. Its branching fraction is measured relative to that of ... -
Observation of charmonium pairs produced exclusively in pp collisions
(Journal of Physics G-Nuclear and Particle Physics, 2014, Vol. 41, No. 11, 2014-09)A search is performed for the central exclusive production of pairs of charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity of 3 fb−1 collected at ... -
Observation of Excited Λ0b Baryons
(Physical Review Letters, 2012, Vol. 109, No. 7 (Octubre), 2012-10-26)Using pp collision data corresponding to 1.0 fb−1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Λ0bπ+π− spectrum with masses 5911.97±0.12(stat)±0.02(syst ... -
Observation of J/ψ-pair production in pp collisions at s=7 TeV
(Physics Letters B, Vol. 707, No. 1 (Gener 2012), 2012-01-16)The production of J/ψpairs in proton–proton collisions at a centre-of-mass energy of 7 TeV has beenobserved using an integrated luminosity of 37.5 pb−1collected with the LHCb detector. The productionc ... -
Observation of Overlapping Spin-1 and Spin-3 ¯D0K− Resonances at Mass 2.86 GeV/c2
(Physical Review Letters, 2014, Vol. 113, No. 16 (Octubre), 2014-10-14)The resonant substructure of B0s→¯D0K−π+ decays is studied using a data sample corresponding to an integrated luminosity of 3.0 fb−1 of pp collision data recorded by the LHCb detector. An excess at ... -
Observation of Photon Polarization in the b→sγ Transition
(Physical Review Letters, 2014, Vol. 112, No. 16 (Abril), 2014-04-22)This Letter presents a study of the flavor-changing neutral current radiative B±→K±π∓π±γ decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass ... -
Observation of several sources of CP violation in B+ → π+ π+ π− decays
(Physical Review Letters, 2020, Vol.124, 031801, 2020-01)Observations are reported of different sources of CP violation from an amplitude analysis of B+→π+π+π− decays, based on a data sample corresponding to an integrated luminosity of 3 fb−1 of pp collisions ... -
Observation of the B0s→η′η′ Decay
(Physical Review Letters, 2015, Vol. 115, No. 5 (Juliol), 2015-07-28)The first observation of the B0s→η′η′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0 fb−1 of integrated luminosity collected with the LHCb detector. ... -
Observation of the Decay B+c → B0s π+
(Physical Review Letters , 2013, Vol. 111, No.18 (Novembre), 2013-11-01)The result of a search for the decay B+c→B0sπ+ is presented, using the B0s→D−sπ+ and B0s→J/ψϕ channels. The analysis is based on a data sample of pp collisions collected with the LHCb detector, corresponding ... -
Observation of the decay B+c → J/ψ K + K − π +
(Journal of High Energy Physics, 2013, Vol. 2013, No.11 (Noviembre), 2013-11-12)The decay B+c → J/ψK + K − π + is observed for the first time, using protonproton collisions collected with the LHCb detector corresponding to an integrated luminosity of 3 fb−1. A signal yield of 78 ± ... -
Observation of the decay B+c → ψ(2S)π+
(Physical Review D, 2013, Vol. 87 , No.7 (Abril), 2013-04-26)The decay B+c→ψ(2S)π+ with ψ(2S)→μ+μ− is observed with a significance of 5.2σ using pp collision data corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment. The branching ... -
Observation of the decay B0s → ψ(2S) K+ π−
(Physics Letters B , 2015, Vol. 747, (Juliol), 2015-07-30)The decay B-0s → ψ(2S)K+π- is observed using a data set corresponding to an integrated luminosity of 3.0fb-1 collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. ... -
Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data
(Nature, 2015, Vol. 522, 2015-05)The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities ... -
Observation of the Resonant Character of the Z(4430)− State
(Physical Review Letters, 2014, Vol. 112, No. 22 (Juny), 2014-06-04)Resonant structures in B0→ψ′π−K+ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb−1 collected with the LHCb detector. The ... -
Observation of the semileptonic decay B+→pp¯¯¯μ+νμ
(Journal of High Energy Physics, 2020, 146, 2020-03)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 ...