Measurement of the CP-violating phase s in the decay Bs0→J/ψ

The LHCb Collaboration

doi:10.1103/PhysRevLett.108.101803

Measurement of the CP-violating phase _s in the decay Bs0→J/ψ

The LHCb Collaboration

Research output: Contribution to journal › Article › Research › peer-review

136 Citations (Scopus)

Abstract

We present a measurement of the time-dependent CP-violating asymmetry in Bs0→J/ψ decays, using data collected with the LHCb detector at the LHC. The decay time distribution of Bs0→J/ψ is characterized by the decay widths Γ _H and Γ _L of the heavy and light mass eigenstates, respectively, of the Bs0-B̄s0 system and by a CP-violating phase _s. In a sample of about 8500 Bs0→J/ψevents isolated from 0.37fb ^-1 of pp collisions at √s=7TeV, we measure _s=0.15±0.18(stat)±0.06(syst)rad. We also find an average Bs0 decay width Γ _s (Γ _L+Γ _H)/2=0.657±0.009(stat)±0.008(syst)ps ^-1 and a decay width difference ΔΓ _s Γ _L- Γ _H=0.123±0.029(stat)±0.011(syst)ps ^-1. Our measurement is insensitive to the transformation ( _s, ΔΓ _s) (π- _s,-ΔΓ _s).

Original language	English
Article number	101803
Number of pages	8
Journal	Physical Review Letters
Volume	108
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.108.101803
Publication status	Published - 9 Mar 2012
Externally published	Yes

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10.1103/PhysRevLett.108.101803

Cite this

@article{62cce482b9a94cfbaffe8d1244d23d8f,

title = "Measurement of the CP-violating phase s in the decay Bs0→J/ψ",

abstract = "We present a measurement of the time-dependent CP-violating asymmetry in Bs0→J/ψ decays, using data collected with the LHCb detector at the LHC. The decay time distribution of Bs0→J/ψ is characterized by the decay widths Γ H and Γ L of the heavy and light mass eigenstates, respectively, of the Bs0-{\=B}s0 system and by a CP-violating phase s. In a sample of about 8500 Bs0→J/ψevents isolated from 0.37fb -1 of pp collisions at √s=7TeV, we measure s=0.15±0.18(stat)±0.06(syst)rad. We also find an average Bs0 decay width Γ s (Γ L+Γ H)/2=0.657±0.009(stat)±0.008(syst)ps -1 and a decay width difference ΔΓ s Γ L- Γ H=0.123±0.029(stat)±0.011(syst)ps -1. Our measurement is insensitive to the transformation ( s, ΔΓ s) (π- s,-ΔΓ s).",

author = "R. Aaij and {Abellan Beteta}, C. and B. Adeva and M. Adinolfi and C. Adrover and A. Affolder and Z. Ajaltouni and J. Albrecht and F. Alessio and M. Alexander and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and Y. Amhis and J. Anderson and Appleby, {R. B.} and {Aquines Gutierrez}, O. and F. Archilli and L. Arrabito and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and S. Bachmann and Back, {J. J.} and Bailey, {D. S.} and V. Balagura and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and A. Bates and C. Bauer and Th Bauer and A. Bay and I. Bediaga and S. Belogurov and K. Belous and I. Belyaev and E. Ben-Haim and M. Benayoun and G. Bencivenni and S. Benson and J. Benton and R. Bernet and Bettler, {M. O.} and {Van Beuzekom}, M. and A. Bien and S. Bifani and T. Bird and A. Bizzeti and Bj{\o}rnstad, {P. M.} and T. Blake and F. Blanc and C. Blanks and J. Blouw and S. Blusk and A. Bobrov and V. Bocci and A. Bondar and N. Bondar and W. Bonivento and S. Borghi and A. Borgia and Bowcock, {T. J.V.} and C. Bozzi and T. Brambach and {Van Den Brand}, J. and J. Bressieux and D. Brett and M. Britsch and T. Britton and Brook, {N. H.} and H. Brown and A. B{\"u}chler-Germann and I. Burducea and A. Bursche and J. Buytaert and S. Cadeddu and O. Callot and M. Calvi and {Calvo Gomez}, M. and A. Camboni and P. Campana and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and L. Carson and {Carvalho Akiba}, K. and G. Casse and M. Cattaneo and Ch Cauet and M. Charles and Ph Charpentier and N. Chiapolini and K. Ciba and {Cid Vidal}, X. and G. Ciezarek and Clarke, {P. E.L.} and M. Clemencic and Cliff, {H. V.} and J. Closier and C. Coca and V. Coco and J. Cogan and P. Collins and A. Comerma-Montells and F. Constantin and A. Contu and A. Cook and M. Coombes and G. Corti and Cowan, {G. A.} and R. Currie and C. D'Ambrosio and P. David and David, {P. N.Y.} and {De Bonis}, I. and {De Capua}, S. and {De Cian}, M. and {De Lorenzi}, F. and {De Miranda}, {J. M.} and {De Paula}, L. and {De Simone}, P. and D. Decamp and M. Deckenhoff and H. Degaudenzi and {Del Buono}, L. and C. Deplano and D. Derkach and O. Deschamps and F. Dettori and J. Dickens and H. Dijkstra and {Diniz Batista}, P. and F. Bonal and {Domingo Donleavy}, S. and F. Dordei and {Dosil Su{\'a}rez}, A. and D. Dossett and A. Dovbnya and F. Dupertuis and R. Dzhelyadin and A. Dziurda and S. Easo and U. Egede and V. Egorychev and S. Eidelman and {Van Eijk}, D. and F. Eisele and S. Eisenhardt and R. Ekelhof and L. Eklund and Ch Elsasser and D. Elsby and {Esperante Pereira}, D. and L. Est{\`e}ve and A. Falabella and E. Fanchini and C. F{\"a}rber and G. Fardell and C. Farinelli and S. Farry and V. Fave and {Fernandez Albor}, V. and M. Ferro-Luzzi and S. Filippov and C. Fitzpatrick and M. Fontana and F. Fontanelli and R. Forty and M. Frank and C. Frei and M. Frosini and S. Furcas and {Gallas Torreira}, A. and D. Galli and M. Gandelman and P. Gandini and Y. Gao and Garnier, {J. C.} and J. Garofoli and {Garra Tico}, J. and L. Garrido and D. Gascon and C. Gaspar and N. Gauvin and M. Gersabeck and T. Gershon and Ph Ghez and V. Gibson and Gligorov, {V. V.} and C. G{\"o}bel and D. Golubkov and A. Golutvin and A. Gomes and H. Gordon and {Grabalosa G{\'a}ndara}, M. and {Graciani Diaz}, R. and {Granado Cardoso}, {L. A.} and E. Graug{\'e}s and G. Graziani and A. Grecu and E. Greening and S. Gregson and B. Gui and E. Gushchin and Yu Guz and T. Gys and G. Haefeli and C. Haen and Haines, {S. C.} and T. Hampson and S. Hansmann-Menzemer and R. Harji and N. Harnew and J. Harrison and Harrison, {P. F.} and T. Hartmann and J. He and V. Heijne and K. Hennessy and P. Henrard and {Hernando Morata}, {J. A.} and {Van Herwijnen}, E. and E. Hicks and K. Holubyev and P. Hopchev and W. Hulsbergen and P. Hunt and T. Huse and Huston, {R. S.} and D. Hutchcroft and D. Hynds and V. Iakovenko and P. Ilten and J. Imong and R. Jacobsson and A. Jaeger and {Jahjah Hussein}, M. and E. Jans and F. Jansen and P. Jaton and B. Jean-Marie and F. Jing and M. John and D. Johnson and {The LHCb Collaboration}",

year = "2012",

month = mar,

day = "9",

doi = "10.1103/PhysRevLett.108.101803",

language = "English",

volume = "108",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "10",

}

TY - JOUR

T1 - Measurement of the CP-violating phase s in the decay Bs0→J/ψ

AU - Aaij, R.

AU - Abellan Beteta, C.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adrover, C.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - Anderson, J.

AU - Appleby, R. B.

AU - Aquines Gutierrez, O.

AU - Archilli, F.

AU - Arrabito, L.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Bachmann, S.

AU - Back, J. J.

AU - Bailey, D. S.

AU - Balagura, V.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Bates, A.

AU - Bauer, C.

AU - Bauer, Th

AU - Bay, A.

AU - Bediaga, I.

AU - Belogurov, S.

AU - Belous, K.

AU - Belyaev, I.

AU - Ben-Haim, E.

AU - Benayoun, M.

AU - Bencivenni, G.

AU - Benson, S.

AU - Benton, J.

AU - Bernet, R.

AU - Bettler, M. O.

AU - Van Beuzekom, M.

AU - Bien, A.

AU - Bifani, S.

AU - Bird, T.

AU - Bizzeti, A.

AU - Bjørnstad, P. M.

AU - Blake, T.

AU - Blanc, F.

AU - Blanks, C.

AU - Blouw, J.

AU - Blusk, S.

AU - Bobrov, A.

AU - Bocci, V.

AU - Bondar, A.

AU - Bondar, N.

AU - Bonivento, W.

AU - Borghi, S.

AU - Borgia, A.

AU - Bowcock, T. J.V.

AU - Bozzi, C.

AU - Brambach, T.

AU - Van Den Brand, J.

AU - Bressieux, J.

AU - Brett, D.

AU - Britsch, M.

AU - Britton, T.

AU - Brook, N. H.

AU - Brown, H.

AU - Büchler-Germann, A.

AU - Burducea, I.

AU - Bursche, A.

AU - Buytaert, J.

AU - Cadeddu, S.

AU - Callot, O.

AU - Calvi, M.

AU - Calvo Gomez, M.

AU - Camboni, A.

AU - Campana, P.

AU - Carbone, A.

AU - Carboni, G.

AU - Cardinale, R.

AU - Cardini, A.

AU - Carson, L.

AU - Carvalho Akiba, K.

AU - Casse, G.

AU - Cattaneo, M.

AU - Cauet, Ch

AU - Charles, M.

AU - Charpentier, Ph

AU - Chiapolini, N.

AU - Ciba, K.

AU - Cid Vidal, X.

AU - Ciezarek, G.

AU - Clarke, P. E.L.

AU - Clemencic, M.

AU - Cliff, H. V.

AU - Closier, J.

AU - Coca, C.

AU - Coco, V.

AU - Cogan, J.

AU - Collins, P.

AU - Comerma-Montells, A.

AU - Constantin, F.

AU - Contu, A.

AU - Cook, A.

AU - Coombes, M.

AU - Corti, G.

AU - Cowan, G. A.

AU - Currie, R.

AU - D'Ambrosio, C.

AU - David, P.

AU - David, P. N.Y.

AU - De Bonis, I.

AU - De Capua, S.

AU - De Cian, M.

AU - De Lorenzi, F.

AU - De Miranda, J. M.

AU - De Paula, L.

AU - De Simone, P.

AU - Decamp, D.

AU - Deckenhoff, M.

AU - Degaudenzi, H.

AU - Del Buono, L.

AU - Deplano, C.

AU - Derkach, D.

AU - Deschamps, O.

AU - Dettori, F.

AU - Dickens, J.

AU - Dijkstra, H.

AU - Diniz Batista, P.

AU - Bonal, F.

AU - Domingo Donleavy, S.

AU - Dordei, F.

AU - Dosil Suárez, A.

AU - Dossett, D.

AU - Dovbnya, A.

AU - Dupertuis, F.

AU - Dzhelyadin, R.

AU - Dziurda, A.

AU - Easo, S.

AU - Egede, U.

AU - Egorychev, V.

AU - Eidelman, S.

AU - Van Eijk, D.

AU - Eisele, F.

AU - Eisenhardt, S.

AU - Ekelhof, R.

AU - Eklund, L.

AU - Elsasser, Ch

AU - Elsby, D.

AU - Esperante Pereira, D.

AU - Estève, L.

AU - Falabella, A.

AU - Fanchini, E.

AU - Färber, C.

AU - Fardell, G.

AU - Farinelli, C.

AU - Farry, S.

AU - Fave, V.

AU - Fernandez Albor, V.

AU - Ferro-Luzzi, M.

AU - Filippov, S.

AU - Fitzpatrick, C.

AU - Fontana, M.

AU - Fontanelli, F.

AU - Forty, R.

AU - Frank, M.

AU - Frei, C.

AU - Frosini, M.

AU - Furcas, S.

AU - Gallas Torreira, A.

AU - Galli, D.

AU - Gandelman, M.

AU - Gandini, P.

AU - Gao, Y.

AU - Garnier, J. C.

AU - Garofoli, J.

AU - Garra Tico, J.

AU - Garrido, L.

AU - Gascon, D.

AU - Gaspar, C.

AU - Gauvin, N.

AU - Gersabeck, M.

AU - Gershon, T.

AU - Ghez, Ph

AU - Gibson, V.

AU - Gligorov, V. V.

AU - Göbel, C.

AU - Golubkov, D.

AU - Golutvin, A.

AU - Gomes, A.

AU - Gordon, H.

AU - Grabalosa Gándara, M.

AU - Graciani Diaz, R.

AU - Granado Cardoso, L. A.

AU - Graugés, E.

AU - Graziani, G.

AU - Grecu, A.

AU - Greening, E.

AU - Gregson, S.

AU - Gui, B.

AU - Gushchin, E.

AU - Guz, Yu

AU - Gys, T.

AU - Haefeli, G.

AU - Haen, C.

AU - Haines, S. C.

AU - Hampson, T.

AU - Hansmann-Menzemer, S.

AU - Harji, R.

AU - Harnew, N.

AU - Harrison, J.

AU - Harrison, P. F.

AU - Hartmann, T.

AU - He, J.

AU - Heijne, V.

AU - Hennessy, K.

AU - Henrard, P.

AU - Hernando Morata, J. A.

AU - Van Herwijnen, E.

AU - Hicks, E.

AU - Holubyev, K.

AU - Hopchev, P.

AU - Hulsbergen, W.

AU - Hunt, P.

AU - Huse, T.

AU - Huston, R. S.

AU - Hutchcroft, D.

AU - Hynds, D.

AU - Iakovenko, V.

AU - Ilten, P.

AU - Imong, J.

AU - Jacobsson, R.

AU - Jaeger, A.

AU - Jahjah Hussein, M.

AU - Jans, E.

AU - Jansen, F.

AU - Jaton, P.

AU - Jean-Marie, B.

AU - Jing, F.

AU - John, M.

AU - Johnson, D.

AU - The LHCb Collaboration

PY - 2012/3/9

Y1 - 2012/3/9

N2 - We present a measurement of the time-dependent CP-violating asymmetry in Bs0→J/ψ decays, using data collected with the LHCb detector at the LHC. The decay time distribution of Bs0→J/ψ is characterized by the decay widths Γ H and Γ L of the heavy and light mass eigenstates, respectively, of the Bs0-B̄s0 system and by a CP-violating phase s. In a sample of about 8500 Bs0→J/ψevents isolated from 0.37fb -1 of pp collisions at √s=7TeV, we measure s=0.15±0.18(stat)±0.06(syst)rad. We also find an average Bs0 decay width Γ s (Γ L+Γ H)/2=0.657±0.009(stat)±0.008(syst)ps -1 and a decay width difference ΔΓ s Γ L- Γ H=0.123±0.029(stat)±0.011(syst)ps -1. Our measurement is insensitive to the transformation ( s, ΔΓ s) (π- s,-ΔΓ s).

AB - We present a measurement of the time-dependent CP-violating asymmetry in Bs0→J/ψ decays, using data collected with the LHCb detector at the LHC. The decay time distribution of Bs0→J/ψ is characterized by the decay widths Γ H and Γ L of the heavy and light mass eigenstates, respectively, of the Bs0-B̄s0 system and by a CP-violating phase s. In a sample of about 8500 Bs0→J/ψevents isolated from 0.37fb -1 of pp collisions at √s=7TeV, we measure s=0.15±0.18(stat)±0.06(syst)rad. We also find an average Bs0 decay width Γ s (Γ L+Γ H)/2=0.657±0.009(stat)±0.008(syst)ps -1 and a decay width difference ΔΓ s Γ L- Γ H=0.123±0.029(stat)±0.011(syst)ps -1. Our measurement is insensitive to the transformation ( s, ΔΓ s) (π- s,-ΔΓ s).

UR - http://www.scopus.com/inward/record.url?scp=84863230661&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.108.101803

DO - 10.1103/PhysRevLett.108.101803

M3 - Article

AN - SCOPUS:84863230661

SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 10

M1 - 101803

ER -

Measurement of the CP-violating phase s in the decay Bs0→J/ψ

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Measurement of the CP-violating phase _s in the decay Bs0→J/ψ