Visualitzant La Salle per autor/a "Vilasís Cardona, Xavier"

First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production

Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2014, Vol. 113, No. 8 (Agosto), 2014-08-20)

The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in b¯b pair production at a hadron collider. The ...

First Measurement of the CP-Violating Phase in B0s→ϕϕ Decays

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 24 (Juny), 2013-06-12)

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the ...

First measurement of time-dependent CP violation in B0s→K+K− decays

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.10 (Octubre), 2013-10-25)

Direct and mixing-induced CP-violating asymmetries in B0s→K+K− decays are measured for the first time using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0 fb−1, collected ...

First observation and amplitude analysis of the B−→D+K−π− decay

Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2015, Vol.91, No.9 (Maig), 2015-05-05)

The B−→D+K−π− decay is observed in a data sample corresponding to 3.0 fb−1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. Its branching fraction is measured to be ...

First observation and measurement of the branching fraction for the decay B 0 s → D ∗ s ∓ K ±

Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.6 (Juny), 2015-06-18)

The first observation of the B 0 s → D ∗ s ∓ K ± decay is reported using 3.0 fb−1 of proton-proton collision data collected by the LHCb experiment. The D ∗ s ∓ mesons are reconstructed through the decay ...

First Observation of a Baryonic B+c Decay

Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2014, Vol. 113, No. 15 (Octubre), 2014-10-10)

A baryonic decay of the B+c meson, B+c→J/ψp¯pπ+, is observed for the first time, with a significance of 7.3 standard deviations, in pp collision data collected with the LHCb detector and corresponding ...

First observation of B0 → D∗+ Xμ−ν decays

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, Vol. 698, No. 1 (Març 2011), 2011)

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays Bs -> Ds+ X mu nu and Bs -> D0 K+ X mu nu are detected. Two structures ...

First observation of B0s → J/ψ f0(980) decays

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, Vol. 698, No 2 (Abril 2011), 2011-01)

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decayB0s→J/ψf0(980) is observed. ThisCP eigenstate mode could be used to measure ...

First Observation of CP Violation in the Decays of B0s Mesons

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 22 (Maig), 2013-05-30)

Using pp collision data corresponding to an integrated luminosity of 1.0 fb−1 and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in ...

First Observation of Excited Ω−b States

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2020, Vol.124, 082002, 2020-02)

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 ...

First observation of the decay B+c → J/ψ K+

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.9 (Setembre), 2013-09-13)

The decay B+c→J/ψK+ is observed for the first time 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-of-mass energy ...

First Observation of the Decay B+c→J/ψπ+π−π+

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 108, No. 25 (Juny), 2012-06-19)

The decay B+c→J/ψπ+π−π+ is observed for the first time, using 0.8 fb−1 of pp collisions at √s=7 TeV collected by the LHCb experiment. The ratio of branching fractions B(B+c→J/ψπ+π−π+)/B(B+c→J/ψπ+) is ...

First observation of the decay B+→π+μ+μ−

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2012, Vol. 2012, No.12 (Desembre), 2012-12-21)

A discovery of the rare decay B + → π + μ + μ − is presented. This decay is observed for the first time, with 5.2 σ significance. The observation is made using pp collision data, corresponding to an ...

First Observation of the Decay B0s→K−μ+νμ and a Measurement of |Vub|/|Vcb|

Calvo Gómez, Míriam; Golobardes, Elisabet; Vilasís Cardona, Xavier (Physical Review Letters, 2021, Vol. 126, 2021-02)

The first observation of the suppressed semileptonic B0s→K−μ+νμ decay is reported. Using a data sample recorded in pp collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity ...

First observation of the decay B0s→K∗0K∗0

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2012,Vol. 709, No. 1-2 (Març 2012), 2012-03-13)

The first observation of the decay $\kstarkstar$ is reported using 35\invpb of data collected by LHCb in proton-proton collisions at a centre-of-mass energy of 7 TeV. A total of $49.8 \pm 7.5$ $B^0_s ...

First observation of the decay B0s→ϕK¯¯¯¯¯∗0

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.10 (Octubre), 2013-10-28)

The first observation of the decay B0s→ϕK¯¯¯¯¯∗0 is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions at s√=7 TeV, collected with ...

First observation of the decay Bbar0s->D0K0 and a measurement of the ratio of branching fractions Br(Bbar0s->D0K0) / Br(Bbar0s->D0 rho0)

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2011, Vol. 706, No. 1 (Novembre), 2011-11-30)

The first observation of the decay B0s →D0K∗0 using pp data collected by the LHCb detector at a centreof- mass energy of 7 TeV, corresponding to an integrated luminosity of 36 pb−1, is reported. A ...

First observation of the decay B¯0s→D0K∗0 and a measurement of the ratio of branching fractions B(B¯0s→D0K∗0)/B(B¯0→D0ρ0)

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, Vol. 706, No. 1 (Novembre 2011), 2011-11-30)

The first observation of the decay B¯s0→D0K⁎0 using pp data collected by the LHCb detector at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 36 pb−1 , is reported. A ...

First Observation of the Decay B∗s2(5840)0→B*+K− and Studies of Excited B0s Mesons

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 15 (Abril), 2013-04-09)

The properties of the orbitally excited (L=1) B0s states are studied by using 1.0 fb−1 of pp collisions at √s=7 TeV collected with the LHCb detector. The first observation of the B∗s2(5840)0 meson ...

First observation of the decays ¯B0(s) → D+sK−π+π− and ¯B0s → Ds1(2536)+π−

Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2012, Vol. 86 , No.11 (Desembre), 2012-12-20)

The first observation of the decays ¯¯¯B0s→D+sK−π+π− and ¯¯¯B0→D+sK−π+π− are reported using an integrated luminosity of 1.0 fb−1 recorded by the LHCb experiment. The branching fractions, normalized ...