Angular analysis of the B0 → K*0e+e− decay in the low-q2 region

LHCb Collaboration; R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. CAlvarez artelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. An; L. Anderlini; J. Anderson; R. Andreassen; M. Andreotti; J. E. Andrews; R. B. Appleby; O. Aquines Gutierrez; F. Archilli; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; S. Bachmann; J. J. Back; A. Badalov; C. Baesso; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; W. Barter; V. Batozskaya; S. Bifani; N. Farley; P. Griffith; I. R. Kenyon; C. Lazzeroni; A. Mazurov; J. McCarthy; C. J. Parkinson; L. Pescatore; N. K. Watson

doi:10.1007/JHEP04(2015)064

Angular analysis of the B⁰ → K^*0e⁺e⁻ decay in the low-q² region

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. CAlvarez artelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonR. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, S. Bifani, N. Farley, P. Griffith, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, N. K. Watson

Physics and Astronomy

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Abstract

An angular analysis of the B⁰ → K^*0e⁺e⁻ decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb⁻¹, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q²) interval between 0.002 and 1.120 GeV²/c⁴. The angular observables F_L and A_T^Re which are related to the K^*0 polarisation and to the lepton forward-backward asymmetry, are measured to be F_L = 0.16 ± 0.06 ± 0.03 and A_T^Re = 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables A_T⁽²⁾ and A_T^Im which are sensitive to the photon polarisation in this q² range, are found to be A_T⁽²⁾ = − 0.23 ± 0.23 ± 0.05 and A_T^Im = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.

Original language	English
Article number	64
Number of pages	23
Journal	Journal of High Energy Physics
Volume	2015
Issue number	4
DOIs	https://doi.org/10.1007/JHEP04(2015)064
Publication status	Published - 14 Apr 2015

Keywords

B physics
Flavour Changing Neutral Currents
Hadron-Hadron Scattering
Polarization
Rare decay

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Cite this

LHCb Collaboration, Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., CAlvarez artelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., ... Watson, N. K. (2015). Angular analysis of the B⁰ → K^*0e⁺e⁻ decay in the low-q² region. Journal of High Energy Physics, 2015(4), Article 64. https://doi.org/10.1007/JHEP04(2015)064

@article{0fea80199467444aa81bbd2a81bb4651,

title = "Angular analysis of the B0 → K*0e+e− decay in the low-q2 region",

abstract = "An angular analysis of the B0 → K*0e+e− decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q2) interval between 0.002 and 1.120 GeV2/c4. The angular observables FL and ATRe which are related to the K*0 polarisation and to the lepton forward-backward asymmetry, are measured to be FL = 0.16 ± 0.06 ± 0.03 and ATRe = 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables AT(2) and ATIm which are sensitive to the photon polarisation in this q2 range, are found to be AT(2) = − 0.23 ± 0.23 ± 0.05 and ATIm = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.",

keywords = "B physics, Flavour Changing Neutral Currents, Hadron-Hadron Scattering, Polarization, Rare decay",

author = "{LHCb Collaboration} and R. Aaij and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and {CAlvarez artelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and J. Anderson and R. Andreassen and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and {Aquines Gutierrez}, O. and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and V. Batozskaya and S. Bifani and N. Farley and P. Griffith and Kenyon, {I. R.} and C. Lazzeroni and A. Mazurov and J. McCarthy and Parkinson, {C. J.} and L. Pescatore and Watson, {N. K.}",

year = "2015",

month = apr,

day = "14",

doi = "10.1007/JHEP04(2015)064",

language = "English",

volume = "2015",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

number = "4",

}

LHCb Collaboration, Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, CAlvarez artelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Anderson, J, Andreassen, R, Andreotti, M, Andrews, JE, Appleby, RB, Aquines Gutierrez, O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Batozskaya, V, Bifani, S, Farley, N, Griffith, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Parkinson, CJ, Pescatore, L & Watson, NK 2015, 'Angular analysis of the B⁰ → K^*0e⁺e⁻ decay in the low-q² region', Journal of High Energy Physics, vol. 2015, no. 4, 64. https://doi.org/10.1007/JHEP04(2015)064

TY - JOUR

T1 - Angular analysis of the B0 → K*0e+e− decay in the low-q2 region

AU - LHCb Collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - CAlvarez artelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Anderson, J.

AU - Andreassen, R.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Aquines Gutierrez, O.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Batozskaya, V.

AU - Bifani, S.

AU - Farley, N.

AU - Griffith, P.

AU - Kenyon, I. R.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - McCarthy, J.

AU - Parkinson, C. J.

AU - Pescatore, L.

AU - Watson, N. K.

PY - 2015/4/14

Y1 - 2015/4/14

N2 - An angular analysis of the B0 → K*0e+e− decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q2) interval between 0.002 and 1.120 GeV2/c4. The angular observables FL and ATRe which are related to the K*0 polarisation and to the lepton forward-backward asymmetry, are measured to be FL = 0.16 ± 0.06 ± 0.03 and ATRe = 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables AT(2) and ATIm which are sensitive to the photon polarisation in this q2 range, are found to be AT(2) = − 0.23 ± 0.23 ± 0.05 and ATIm = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.

AB - An angular analysis of the B0 → K*0e+e− decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q2) interval between 0.002 and 1.120 GeV2/c4. The angular observables FL and ATRe which are related to the K*0 polarisation and to the lepton forward-backward asymmetry, are measured to be FL = 0.16 ± 0.06 ± 0.03 and ATRe = 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables AT(2) and ATIm which are sensitive to the photon polarisation in this q2 range, are found to be AT(2) = − 0.23 ± 0.23 ± 0.05 and ATIm = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.

KW - B physics

KW - Flavour Changing Neutral Currents

KW - Hadron-Hadron Scattering

KW - Polarization

KW - Rare decay

UR - http://www.scopus.com/inward/record.url?scp=84973442076&partnerID=8YFLogxK

U2 - 10.1007/JHEP04(2015)064

DO - 10.1007/JHEP04(2015)064

M3 - Article

AN - SCOPUS:84973442076

SN - 1126-6708

VL - 2015

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 4

M1 - 64

ER -