Test of lepton universality with Λb0→pK−                             ℓ+                             ℓ− decays

The LHCb Collaboration

doi:10.1007/JHEP05(2020)040

Test of lepton universality with Λb0→^pK− ^ℓ+ ^ℓ− decays

The LHCb Collaboration

School of Physics and Astronomy

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

71 Citations (Scopus)

Abstract

The ratio of branching fractions of the decays Λb0 → pK⁻e⁺e⁻ and Λb0 → pK⁻μ⁺μ⁻,RpK−1, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb⁻¹ recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q²< 6.0 GeV²/c⁴ and the pK⁻ mass range m(pK⁻) < 2600 MeV/c², the ratio of branching fractions is measured to be RpK−1=1.17−0.16+0.18±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λb0 → pK⁻e⁺e⁻. [Figure not available: see fulltext.].

Original language	English
Article number	40
Number of pages	27
Journal	Journal of High Energy Physics
Volume	2020
Issue number	5
DOIs	https://doi.org/10.1007/JHEP05(2020)040
Publication status	Published - 11 May 2020

Keywords

B physics
Branching fraction
Flavour Changing Neutral Currents
Hadron- Hadron scattering (experiments)
Rare decay

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10.1007/JHEP05(2020)040

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@article{d449a610476f448eb205ef2e368a8a24,

title = "Test of lepton universality with Λb0→pK− ℓ+ ℓ− decays",

abstract = "The ratio of branching fractions of the decays Λb0 → pK−e+e− and Λb0 → pK−μ+μ−,RpK−1, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2< 6.0 GeV2/c4 and the pK− mass range m(pK−) < 2600 MeV/c2, the ratio of branching fractions is measured to be RpK−1=1.17−0.16+0.18±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λb0 → pK−e+e−. [Figure not available: see fulltext.].",

keywords = "B physics, Branching fraction, Flavour Changing Neutral Currents, Hadron- Hadron scattering (experiments), Rare decay",

author = "R. Aaij and {Abell{\'a}n Beteta}, C. and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, {C. A.} and S. Aiola and Z. Ajaltouni and S. Akar and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and F. Archilli and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and Back, {J. J.} and S. Baker and V. Balagura and W. Baldini and A. Baranov and Barlow, {R. J.} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and G. Bassi and V. Batozskaya and B. Batsukh and A. Battig and A. Bay and M. Becker and F. Bedeschi and I. Bediaga and A. Beiter and Bel, {L. J.} and V. Belavin and S. Belin and N. Beliy and V. Bellee and K. Belous and I. Belyaev and G. Bencivenni and E. Ben-Haim and S. Benson and S. Beranek and A. Berezhnoy and R. Bernet and D. Berninghoff and Bernstein, {H. C.} and C. Bertella and E. Bertholet and A. Bertolin and C. Betancourt and F. Betti and Bettler, {M. O.} and Ia Bezshyiko and S. Bhasin and J. Bhom and Bieker, {M. S.} and S. Bifani and P. Billoir and A. Bizzeti and M. Bj{\o}rn and Blago, {M. P.} and T. Blake and F. Blanc and S. Blusk and D. Bobulska and V. Bocci and {Boente Garcia}, O. and T. Boettcher and A. Boldyrev and A. Bondar and N. Bondar and S. Borghi and M. Borisyak and M. Borsato and Borsuk, {J. T.} and Bowcock, {T. J.V.} and C. Bozzi and Bradley, {M. J.} and S. Braun and {Brea Rodriguez}, A. and M. Brodski and J. Brodzicka and {Brossa Gonzalo}, A. and D. Brundu and E. Buchanan and A. B{\"u}chler-Germann and A. Buonaura and C. Burr and A. Bursche and Butter, {J. S.} and J. Buytaert and W. Byczynski and S. Cadeddu and H. Cai and R. Calabrese and {Calero Diaz}, L. and S. Cali and R. Calladine and M. Calvi and {Calvo Gomez}, M. and {Camargo Magalhaes}, P. and A. Camboni and P. Campana and {Campora Perez}, {D. H.} and L. Capriotti and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and P. Carniti and {Carvalho Akiba}, K. and {Casais Vidal}, A. and G. Casse and M. Cattaneo and G. Cavallero and S. Celani and R. Cenci and J. Cerasoli and Chapman, {M. G.} and M. Charles and Ph Charpentier and G. Chatzikonstantinidis and M. Chefdeville and V. Chekalina and C. Chen and S. Chen and A. Chernov and Chitic, {S. G.} and V. Chobanova and M. Chrzaszcz and A. Chubykin and P. Ciambrone and Cicala, {M. F.} and {Cid Vidal}, X. and G. Ciezarek and F. Cindolo and Clarke, {P. E.L.} and M. Clemencic and Cliff, {H. V.} and J. Closier and Cobbledick, {J. L.} and V. Coco and Coelho, {J. A.B.} and J. Cogan and E. Cogneras and L. Cojocariu and P. Collins and T. Colombo and A. Comerma-Montells and A. Contu and N. Cooke and G. Coombs and S. Coquereau and G. Corti and {Costa Sobral}, {C. M.} and B. Couturier and Craik, {D. C.} and J. Crkovsk{\'a} and A. Crocombe and {Cruz Torres}, M. and R. Currie and {Da Silva}, {C. L.} and E. Dall{\textquoteright}Occo and J. Dalseno and C. D{\textquoteright}Ambrosio and A. Danilina and P. d{\textquoteright}Argent and A. Davis and {De Aguiar Francisco}, O. and {De Bruyn}, K. and {De Capua}, S. and {De Cian}, M. and {De Miranda}, {J. M.} and {De Paula}, L. and {De Serio}, M. and {De Simone}, P. and {de Vries}, {J. A.} and Dean, {C. T.} and W. Dean and D. Decamp and {Del Buono}, L. and B. Delaney and Dembinski, {H. P.} and M. Demmer and A. Dendek and V. Denysenko and D. Derkach and O. Deschamps and F. Desse and F. Dettori and B. Dey and {Di Canto}, A. and {Di Nezza}, P. and S. Didenko and H. Dijkstra and V. Dobishuk and F. Dordei and M. Dorigo and {dos Reis}, {A. C.} and L. Douglas and A. Dovbnya and K. Dreimanis and Dudek, {M. W.} and L. Dufour and G. Dujany and P. Durante and Durham, {J. M.} and D. Dutta and M. Dziewiecki and A. Dziurda and A. Dzyuba and S. Easo and U. Egede and V. Egorychev and S. Eidelman and S. Eisenhardt and R. Ekelhof and S. Ek-In and L. Eklund and S. Ely and A. Ene and E. Epple and S. Escher and S. Esen and T. Evans and A. Falabella and J. Fan and N. Farley and T. Hadavizadeh and Lane, {Jake J.} and {The LHCb Collaboration}",

year = "2020",

month = may,

day = "11",

doi = "10.1007/JHEP05(2020)040",

language = "English",

volume = "2020",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer-Verlag London Ltd.",

number = "5",

}

TY - JOUR

T1 - Test of lepton universality with Λb0→pK− ℓ+ ℓ− decays

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Archilli, F.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Baranov, A.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Bassi, G.

AU - Batozskaya, V.

AU - Batsukh, B.

AU - Battig, A.

AU - Bay, A.

AU - Becker, M.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Beiter, A.

AU - Bel, L. J.

AU - Belavin, V.

AU - Belin, S.

AU - Beliy, N.

AU - Bellee, V.

AU - Belous, K.

AU - Belyaev, I.

AU - Bencivenni, G.

AU - Ben-Haim, E.

AU - Benson, S.

AU - Beranek, S.

AU - Berezhnoy, A.

AU - Bernet, R.

AU - Berninghoff, D.

AU - Bernstein, H. C.

AU - Bertella, C.

AU - Bertholet, E.

AU - Bertolin, A.

AU - Betancourt, C.

AU - Betti, F.

AU - Bettler, M. O.

AU - Bezshyiko, Ia

AU - Bhasin, S.

AU - Bhom, J.

AU - Bieker, M. S.

AU - Bifani, S.

AU - Billoir, P.

AU - Bizzeti, A.

AU - Bjørn, M.

AU - Blago, M. P.

AU - Blake, T.

AU - Blanc, F.

AU - Blusk, S.

AU - Bobulska, D.

AU - Bocci, V.

AU - Boente Garcia, O.

AU - Boettcher, T.

AU - Boldyrev, A.

AU - Bondar, A.

AU - Bondar, N.

AU - Borghi, S.

AU - Borisyak, M.

AU - Borsato, M.

AU - Borsuk, J. T.

AU - Bowcock, T. J.V.

AU - Bozzi, C.

AU - Bradley, M. J.

AU - Braun, S.

AU - Brea Rodriguez, A.

AU - Brodski, M.

AU - Brodzicka, J.

AU - Brossa Gonzalo, A.

AU - Brundu, D.

AU - Buchanan, E.

AU - Büchler-Germann, A.

AU - Buonaura, A.

AU - Burr, C.

AU - Bursche, A.

AU - Butter, J. S.

AU - Buytaert, J.

AU - Byczynski, W.

AU - Cadeddu, S.

AU - Cai, H.

AU - Calabrese, R.

AU - Calero Diaz, L.

AU - Cali, S.

AU - Calladine, R.

AU - Calvi, M.

AU - Calvo Gomez, M.

AU - Camargo Magalhaes, P.

AU - Camboni, A.

AU - Campana, P.

AU - Campora Perez, D. H.

AU - Capriotti, L.

AU - Carbone, A.

AU - Carboni, G.

AU - Cardinale, R.

AU - Cardini, A.

AU - Carniti, P.

AU - Carvalho Akiba, K.

AU - Casais Vidal, A.

AU - Casse, G.

AU - Cattaneo, M.

AU - Cavallero, G.

AU - Celani, S.

AU - Cenci, R.

AU - Cerasoli, J.

AU - Chapman, M. G.

AU - Charles, M.

AU - Charpentier, Ph

AU - Chatzikonstantinidis, G.

AU - Chefdeville, M.

AU - Chekalina, V.

AU - Chen, C.

AU - Chen, S.

AU - Chernov, A.

AU - Chitic, S. G.

AU - Chobanova, V.

AU - Chrzaszcz, M.

AU - Chubykin, A.

AU - Ciambrone, P.

AU - Cicala, M. F.

AU - Cid Vidal, X.

AU - Ciezarek, G.

AU - Cindolo, F.

AU - Clarke, P. E.L.

AU - Clemencic, M.

AU - Cliff, H. V.

AU - Closier, J.

AU - Cobbledick, J. L.

AU - Coco, V.

AU - Coelho, J. A.B.

AU - Cogan, J.

AU - Cogneras, E.

AU - Cojocariu, L.

AU - Collins, P.

AU - Colombo, T.

AU - Comerma-Montells, A.

AU - Contu, A.

AU - Cooke, N.

AU - Coombs, G.

AU - Coquereau, S.

AU - Corti, G.

AU - Costa Sobral, C. M.

AU - Couturier, B.

AU - Craik, D. C.

AU - Crkovská, J.

AU - Crocombe, A.

AU - Cruz Torres, M.

AU - Currie, R.

AU - Da Silva, C. L.

AU - Dall’Occo, E.

AU - Dalseno, J.

AU - D’Ambrosio, C.

AU - Danilina, A.

AU - d’Argent, P.

AU - Davis, A.

AU - De Aguiar Francisco, O.

AU - De Bruyn, K.

AU - De Capua, S.

AU - De Cian, M.

AU - De Miranda, J. M.

AU - De Paula, L.

AU - De Serio, M.

AU - De Simone, P.

AU - de Vries, J. A.

AU - Dean, C. T.

AU - Dean, W.

AU - Decamp, D.

AU - Del Buono, L.

AU - Delaney, B.

AU - Dembinski, H. P.

AU - Demmer, M.

AU - Dendek, A.

AU - Denysenko, V.

AU - Derkach, D.

AU - Deschamps, O.

AU - Desse, F.

AU - Dettori, F.

AU - Dey, B.

AU - Di Canto, A.

AU - Di Nezza, P.

AU - Didenko, S.

AU - Dijkstra, H.

AU - Dobishuk, V.

AU - Dordei, F.

AU - Dorigo, M.

AU - dos Reis, A. C.

AU - Douglas, L.

AU - Dovbnya, A.

AU - Dreimanis, K.

AU - Dudek, M. W.

AU - Dufour, L.

AU - Dujany, G.

AU - Durante, P.

AU - Durham, J. M.

AU - Dutta, D.

AU - Dziewiecki, M.

AU - Dziurda, A.

AU - Dzyuba, A.

AU - Easo, S.

AU - Egede, U.

AU - Egorychev, V.

AU - Eidelman, S.

AU - Eisenhardt, S.

AU - Ekelhof, R.

AU - Ek-In, S.

AU - Eklund, L.

AU - Ely, S.

AU - Ene, A.

AU - Epple, E.

AU - Escher, S.

AU - Esen, S.

AU - Evans, T.

AU - Falabella, A.

AU - Fan, J.

AU - Farley, N.

AU - Hadavizadeh, T.

AU - Lane, Jake J.

AU - The LHCb Collaboration

PY - 2020/5/11

Y1 - 2020/5/11

N2 - The ratio of branching fractions of the decays Λb0 → pK−e+e− and Λb0 → pK−μ+μ−,RpK−1, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2< 6.0 GeV2/c4 and the pK− mass range m(pK−) < 2600 MeV/c2, the ratio of branching fractions is measured to be RpK−1=1.17−0.16+0.18±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λb0 → pK−e+e−. [Figure not available: see fulltext.].

AB - The ratio of branching fractions of the decays Λb0 → pK−e+e− and Λb0 → pK−μ+μ−,RpK−1, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2< 6.0 GeV2/c4 and the pK− mass range m(pK−) < 2600 MeV/c2, the ratio of branching fractions is measured to be RpK−1=1.17−0.16+0.18±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λb0 → pK−e+e−. [Figure not available: see fulltext.].

KW - B physics

KW - Branching fraction

KW - Flavour Changing Neutral Currents

KW - Hadron- Hadron scattering (experiments)

KW - Rare decay

UR - http://www.scopus.com/inward/record.url?scp=85084568728&partnerID=8YFLogxK

U2 - 10.1007/JHEP05(2020)040

DO - 10.1007/JHEP05(2020)040

M3 - Article

AN - SCOPUS:85084568728

SN - 1126-6708

VL - 2020

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 5

M1 - 40

ER -

Test of lepton universality with Λb0→pK− ℓ+ ℓ− decays

Abstract

Keywords

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Test of lepton universality with Λb0→^pK− ^ℓ+ ^ℓ− decays