Differential branching fraction and angular analysis of Lambda(0)(b) -> Lambda mu(+)mu(-) decays

R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. An; L. Anderlini; 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; V. Battista; L. Beaucourt; J. Beddow; F. Bedeschi; I. Bediaga; L. J. Bel; I. Belyaev; E. Ben-Haim; G. Bencivenni; C. J. G. Onderwater; A. Pellegrino; S. Tolk; LHCb Collaboration

doi:10.1007/JHEP06(2015)115

Differential branching fraction and angular analysis of Lambda(0)(b) -> Lambda mu(+)mu(-) decays

R. Aaij^*, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, M. Andreotti, J. E. AndrewsR. 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, V. Battista, L. Beaucourt, J. Beddow, F. Bedeschi, I. Bediaga, L. J. Bel, I. Belyaev, E. Ben-Haim, G. Bencivenni, C. J. G. Onderwater, A. Pellegrino, S. Tolk, LHCb Collaboration

^*Corresponding author for this work

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Abstract

The differential branching fraction of the rare decay Lambda(0)(b) -> Lambda mu(+)mu(-) is measured as a function of q(2), the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment. Evidence of signal is observed in the q(2) region below the square of the J/psi mass. Integrating over 15 <q(2) <20 GeV2/c(4) the differential branching fraction is measured as

dB(Lambda(0)(b) -> Lambda mu(+)mu(-))/dq(2) = (1.18(-0.08)(+0.09) +/- 0.03 +/- 0.27) x 10(-7) (GeV2/c(4))(-1)

where the uncertainties are statistical, systematic and due to the normalisation mode Lambda(0)(b) -> J/psi Lambda , respectively. In the q(2) intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A(FB)(l)) and hadron (A(FB)(h)) systems are measured for the first time. In the range 15 <q(2) <20GeV(2)/c(4) they are found to be

A(FB)(l) = -0.05 +/- 0.09 (stat) +/- 0.03 (syst) and

A(FB)(h) = -0.29 +/- 0.07 (stat) +/- 0.03 (syst).

Original language	English
Number of pages	29
Journal	Journal of High Energy Physics
Volume	115
Issue number	6
DOIs	https://doi.org/10.1007/JHEP06(2015)115
Publication status	Published - 17-Jun-2015

Keywords

Rare decay
Hadron-Hadron Scattering
Branching fraction
B physics
Flavour Changing Neutral Currents
POLARIZATION
PACKAGE

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Erratum to: Differential branching fraction and angular analysis of Λ b 0 → Λμ+μ− decays
Onderwater, C. J. G. & LHCb Collaboration, Sept-2018, In: Journal of High Energy Physics. 2018, 9, 7 p., 145.
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Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Cartelle, P. A., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreotti, M., ... LHCb Collaboration (2015). Differential branching fraction and angular analysis of Lambda(0)(b) -> Lambda mu(+)mu(-) decays. Journal of High Energy Physics, 115(6). https://doi.org/10.1007/JHEP06(2015)115

@article{c74be6dbebfb4a6688b72231db628805,

title = "Differential branching fraction and angular analysis of Lambda(0)(b) -> Lambda mu(+)mu(-) decays",

abstract = "The differential branching fraction of the rare decay Lambda(0)(b) -> Lambda mu(+)mu(-) is measured as a function of q(2), the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment. Evidence of signal is observed in the q(2) region below the square of the J/psi mass. Integrating over 15 dB(Lambda(0)(b) -> Lambda mu(+)mu(-))/dq(2) = (1.18(-0.08)(+0.09) +/- 0.03 +/- 0.27) x 10(-7) (GeV2/c(4))(-1)where the uncertainties are statistical, systematic and due to the normalisation mode Lambda(0)(b) -> J/psi Lambda , respectively. In the q(2) intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A(FB)(l)) and hadron (A(FB)(h)) systems are measured for the first time. In the range 15 A(FB)(l) = -0.05 +/- 0.09 (stat) +/- 0.03 (syst) andA(FB)(h) = -0.29 +/- 0.07 (stat) +/- 0.03 (syst).",

keywords = "Rare decay, Hadron-Hadron Scattering, Branching fraction, B physics, Flavour Changing Neutral Currents, POLARIZATION, PACKAGE",

author = "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 Cartelle, {P. Alvarez} and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and Gutierrez, {O. Aquines} 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 V. Battista and L. Beaucourt and J. Beddow and F. Bedeschi and I. Bediaga and Bel, {L. J.} and I. Belyaev and E. Ben-Haim and G. Bencivenni and Onderwater, {C. J. G.} and A. Pellegrino and S. Tolk and {LHCb Collaboration}",

year = "2015",

month = jun,

day = "17",

doi = "10.1007/JHEP06(2015)115",

language = "English",

volume = "115",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer",

number = "6",

}

Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Cartelle, PA, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreotti, M, Andrews, JE, Appleby, RB, Gutierrez, OA, 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, Battista, V, Beaucourt, L, Beddow, J, Bedeschi, F, Bediaga, I, Bel, LJ, Belyaev, I, Ben-Haim, E, Bencivenni, G, Onderwater, CJG, Pellegrino, A, Tolk, S & LHCb Collaboration 2015, 'Differential branching fraction and angular analysis of Lambda(0)(b) -> Lambda mu(+)mu(-) decays', Journal of High Energy Physics, vol. 115, no. 6. https://doi.org/10.1007/JHEP06(2015)115

TY - JOUR

T1 - Differential branching fraction and angular analysis of Lambda(0)(b) -> Lambda mu(+)mu(-) decays

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 - Cartelle, P. Alvarez

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Gutierrez, O. Aquines

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 - Battista, V.

AU - Beaucourt, L.

AU - Beddow, J.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Bel, L. J.

AU - Belyaev, I.

AU - Ben-Haim, E.

AU - Bencivenni, G.

AU - Onderwater, C. J. G.

AU - Pellegrino, A.

AU - Tolk, S.

AU - LHCb Collaboration

PY - 2015/6/17

Y1 - 2015/6/17

N2 - The differential branching fraction of the rare decay Lambda(0)(b) -> Lambda mu(+)mu(-) is measured as a function of q(2), the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment. Evidence of signal is observed in the q(2) region below the square of the J/psi mass. Integrating over 15 dB(Lambda(0)(b) -> Lambda mu(+)mu(-))/dq(2) = (1.18(-0.08)(+0.09) +/- 0.03 +/- 0.27) x 10(-7) (GeV2/c(4))(-1)where the uncertainties are statistical, systematic and due to the normalisation mode Lambda(0)(b) -> J/psi Lambda , respectively. In the q(2) intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A(FB)(l)) and hadron (A(FB)(h)) systems are measured for the first time. In the range 15 A(FB)(l) = -0.05 +/- 0.09 (stat) +/- 0.03 (syst) andA(FB)(h) = -0.29 +/- 0.07 (stat) +/- 0.03 (syst).

AB - The differential branching fraction of the rare decay Lambda(0)(b) -> Lambda mu(+)mu(-) is measured as a function of q(2), the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment. Evidence of signal is observed in the q(2) region below the square of the J/psi mass. Integrating over 15 dB(Lambda(0)(b) -> Lambda mu(+)mu(-))/dq(2) = (1.18(-0.08)(+0.09) +/- 0.03 +/- 0.27) x 10(-7) (GeV2/c(4))(-1)where the uncertainties are statistical, systematic and due to the normalisation mode Lambda(0)(b) -> J/psi Lambda , respectively. In the q(2) intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A(FB)(l)) and hadron (A(FB)(h)) systems are measured for the first time. In the range 15 A(FB)(l) = -0.05 +/- 0.09 (stat) +/- 0.03 (syst) andA(FB)(h) = -0.29 +/- 0.07 (stat) +/- 0.03 (syst).

KW - Rare decay

KW - Hadron-Hadron Scattering

KW - Branching fraction

KW - B physics

KW - Flavour Changing Neutral Currents

KW - POLARIZATION

KW - PACKAGE

U2 - 10.1007/JHEP06(2015)115

DO - 10.1007/JHEP06(2015)115

M3 - Article

SN - 1029-8479

VL - 115

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 6

ER -

Differential branching fraction and angular analysis of Lambda(0)(b) -> Lambda mu(+)mu(-) decays

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Erratum to: Differential branching fraction and angular analysis of Λ b 0 → Λμ+μ− decays

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