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Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F et al (show 834 more authors) , Alexander, M, Albero, A Alfonso, Alkhazov, G, Cartelle, P Alvarez, Alves, AA Jr, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barrand, GC, Barsuk, S, Barter, W, Bartolini, M, baryshnikov, F, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belin, S, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, van Beuzekom, M, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bifani, S, Billoir, P, Birnkraut, A, Bizzeti, A, Bjorn, M, Blago, MP, Blake, T, Blanc, F, Blusk, S, Bobulska, D, Bocci, V, Boente Garcia, O, Boettcher, T, Bondar, A, Bondar, N, Borghi, S, Borisyak, M, Borsato, M, Bossu, F, Boubdir, M, Bowcock, TJV 
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Heinicke, K, Heister, A, Hennessy, K ORCID: 0000-0002-1529-8087, Henry, L, van Herwijnen, E, Heuel, J, Hess, M, Hicheur, A, Charman, R Hidalgo, Hill, D, Hilton, M, Hopchev, PH, Hu, J, Hu, W, Huang, W, Huard, ZC, Hulsbergen, W, Humair, T, Hushchyn, M, Hutchcroft, D ORCID: 0000-0002-4174-6509, Hynds, D, Ibis, P, Idzik, M, Ilten, P, Inglessi, A, Inyakin, A, Ivshin, K, Jacobsson, R, Jalocha, J, Jans, E, Jashal, BK, Jawahery, A, Jiang, F, John, M, Johnson, D, Jones, CR, Joram, C, Jost, B, Jurik, N, Kandybei, S, Karacson, M, Kariuki, JM, Karodia, S, Kazeev, N, Kecke, M, Keizer, F, Kelsey, M, Kenzie, M, Ketel, T, Khairullin, E, Khanji, B, Khurewathanakul, C, Kim, KE, Kirn, T, Kirsebom, VS, Klaver, S, Klimaszewski, K, Klimkovich, T, Koliiev, S, Kolpin, M, Kopecna, R, Koppenburg, P, Kostiuk, I, Kotriakhova, S, Kozeiha, M, Kravchuk, L, Kreps, M, Kress, F, Krokovny, P, Krupa, W, Krzemien, W, Kucewicz, W, Kucharczyk, M, Kudryavtsev, V, Kuonen, AK, Kvaratskheliya, T, Lacarrere, D, Lafferty, G, Lai, 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(2020)
Strong constraints on the <i>b</i> → <i>sγ</i> photon polarisation from <i>B</i><SUP>0</SUP> → <i>K</i><SUP>*0</SUP><i>e</i><SUP>+</SUP><i>e<SUP>-</SUP></i> decays.
JOURNAL OF HIGH ENERGY PHYSICS, 12 (12).
081-.
Abstract
An angular analysis of the $B^0 \to K^{*0} e^+ e^-$ decay is performed using
a data sample corresponding to an integrated luminosity of $9~{\rm fb}^{-1}$ of
$pp$ collisions collected with the LHCb experiment. The analysis is conducted
in the very low dielectron mass squared ($q^2$) interval between $0.0008$ and
$0.257~{\rm GeV}^2$, where the rate is dominated by the $B^0\to K^{\ast
0}\gamma$ transition with a virtual photon. The fraction of longitudinal
polarisation of the $K^{\ast 0}$ meson, $F_{\rm L}$, is measured to be $F_{\rm
L} = (4.4 \pm 2.6 \pm 1.4)\%$, where the first uncertainty is statistical and
the second systematic. The $A_{\rm T}^{\rm Re}$ observable, which is related to
the lepton forward-backward asymmetry, is measured to be $A_{\rm T}^{\rm
Re}=-0.06 \pm 0.08 \pm 0.02$. The $A_{\rm T}^{(2)}$ and $A_{\rm T}^{\rm Im}$
transverse asymmetries, which are sensitive to the virtual photon polarisation,
are found to be $A_{\rm T}^{(2)} = 0.11 \pm 0.10 \ \pm 0.02$ and $A_{\rm
T}^{\rm Im} = 0.02 \pm 0.10 \pm 0.01$. The results are consistent with Standard
Model predictions and provide the world's best constraint on the $b\to s\gamma$
photon polarisation.
| Item Type: |
Article
|
| Additional Information: |
All figures and tables, along with machine-readable versions and any
supplementary material and additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-020.html (LHCb
public pages) |
| Uncontrolled Keywords: |
Rare decay, Flavour Changing Neutral Currents, Polarization, B physics, Hadron-Hadron scattering (experiments) |
| Divisions: |
Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: |
Symplectic Admin
|
| Date Deposited: |
01 Sep 2021 10:36 |
| Last Modified: |
14 Mar 2024 23:05 |
| DOI: |
10.1007/JHEP12(2020)081 |
| Related URLs: |
|
| URI: |
https://livrepository.liverpool.ac.uk/id/eprint/3134996 |
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