Test of lepton universality using B+→K+l+l- decays

LHCb Collaboration; R. Aaij; Simone Bifani; Nathanael Farley; Peter Griffith; Ian Kenyon; Cristina Lazzeroni; Alexander Mazurov; Luca Pescatore; Nigel Watson; Timothy Williams

doi:10.1103/PhysRevLett.113.151601

Test of lepton universality using B⁺→K⁺l⁺l^- decays

LHCb Collaboration, R. Aaij, Simone Bifani, Nathanael Farley, Peter Griffith, Ian Kenyon, Cristina Lazzeroni, Alexander Mazurov, Luca Pescatore, Nigel Watson, Timothy Williams

Physics and Astronomy

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Abstract

A measurement of the ratio of the branching fractions of the B⁺→K⁺μ⁺μ^- and B⁺→K⁺e⁺e^- decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb^-1, recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 1<q²<6 GeV²/c⁴ is measured to be 0.745^+0.090_−0.074(stat)±0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.

Original language	English
Article number	151601
Number of pages	10
Journal	Physical Review Letters
Volume	113
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.113.151601
Publication status	Published - 6 Oct 2014

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AaijR2014TestFinal published version, 591 KBLicence: Creative Commons: Attribution (CC BY)

PPGP Capital Equipment Call
Newman, P. (Principal Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/10/13 → 30/09/14
Project: Research Councils
ATLAS - UK Tracker Upgrade
Newman, P. (Principal Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/10/12 → 30/09/13
Project: Research Councils
Birmimgham Experimental Particle Physics Consolidated Grant
Newman, P. (Principal Investigator), Charlton, D. (Co-Investigator), Hawkes, C. (Co-Investigator), Lazzeroni, C. (Co-Investigator), Nikolopoulos, K. (Co-Investigator), Watson, A. (Co-Investigator), Watson, N. (Co-Investigator) & Wilson, J. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
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Project: Research Councils
Wakeham Efficiency Saving PP
Newman, P. (Principal Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
9/03/12 → 31/03/12
Project: Research Councils
Experimental Particle Physics 2009-2014
Newman, P. (Principal Investigator), Charlton, D. (Co-Investigator), Hawkes, C. (Co-Investigator), Watkins, P. (Co-Investigator), Watson, A. (Co-Investigator), Watson, N. (Co-Investigator), Wilson, J. (Co-Investigator) & Lazzeroni, C. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/10/09 → 30/09/12
Project: Research Councils
Experimental Particle Physics 2006-2011
Watkins, P. (Principal Investigator), Charlton, D. (Co-Investigator), Evans, P. (Co-Investigator), Hawkes, C. (Co-Investigator), Newman, P. (Co-Investigator), Watson, A. (Co-Investigator), Watson, N. (Co-Investigator) & Wilson, J. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/10/06 → 30/09/11
Project: Research Councils

Cite this

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title = "Test of lepton universality using B+→K+l+l- decays",

abstract = "A measurement of the ratio of the branching fractions of the B+→K+μ+μ- and B+→K+e+e- decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb-1, recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 12<6 GeV2/c4 is measured to be 0.745+0.090−0.074(stat)±0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.",

author = "{LHCb Collaboration} and R. Aaij and Simone Bifani and Nathanael Farley and Peter Griffith and Ian Kenyon and Cristina Lazzeroni and Alexander Mazurov and Luca Pescatore and Nigel Watson and Timothy Williams",

year = "2014",

month = oct,

day = "6",

doi = "10.1103/PhysRevLett.113.151601",

language = "English",

volume = "113",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "15",

}

TY - JOUR

T1 - Test of lepton universality using B+→K+l+l- decays

AU - LHCb Collaboration

AU - Aaij, R.

AU - Bifani, Simone

AU - Farley, Nathanael

AU - Griffith, Peter

AU - Kenyon, Ian

AU - Lazzeroni, Cristina

AU - Mazurov, Alexander

AU - Pescatore, Luca

AU - Watson, Nigel

AU - Williams, Timothy

PY - 2014/10/6

Y1 - 2014/10/6

N2 - A measurement of the ratio of the branching fractions of the B+→K+μ+μ- and B+→K+e+e- decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb-1, recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 12<6 GeV2/c4 is measured to be 0.745+0.090−0.074(stat)±0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.

AB - A measurement of the ratio of the branching fractions of the B+→K+μ+μ- and B+→K+e+e- decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb-1, recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 12<6 GeV2/c4 is measured to be 0.745+0.090−0.074(stat)±0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.

U2 - 10.1103/PhysRevLett.113.151601

DO - 10.1103/PhysRevLett.113.151601

M3 - Article

SN - 0031-9007

VL - 113

JO - Physical Review Letters

JF - Physical Review Letters

IS - 15

M1 - 151601

ER -

Test of lepton universality using B+→K+l+l- decays

Abstract

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Projects

PPGP Capital Equipment Call

ATLAS - UK Tracker Upgrade

Birmimgham Experimental Particle Physics Consolidated Grant

Wakeham Efficiency Saving PP

Experimental Particle Physics 2009-2014

Experimental Particle Physics 2006-2011

Cite this

Test of lepton universality using B⁺→K⁺l⁺l^- decays