Observation of the rare B0<inf>s</inf>→μ+μ- decay from the combined analysis of CMS and LHCb data

V. Khachatryan; A. M. Sirunyan; A. Tumasyan; W. Adam; T. Bergauer; M. Dragicevic; J. Erö; M. Friedl; R. Frühwirth; V. M. Ghete; C. Hartl; N. Hörmann; J. Hrubec; M. Jeitler; W. Kiesenhofer; V. Knünz; M. Krammer; I. Krätschmer; D. Liko; I. Mikulec; D. Rabady; B. Rahbaran; H. Rohringer; R. Schöfbeck; J. Strauss; W. Treberer-Treberspurg; W. Waltenberger; C. E. Wulz; V. Mossolov; N. Shumeiko; J. Suarez Gonzalez; S. Alderweireldt; S. Bansal; T. Cornelis; E. A. De Wolf; X. Janssen; A. Knutsson; J. Lauwers; S. Luyckx; S. Ochesanu; R. Rougny; M. Van De Klundert; H. Van Haevermaet; P. Van Mechelen; N. Van Remortel; A. Van Spilbeeck; F. Blekman; S. Blyweert; J. D'Hondt; N. Daci; N. Heracleous; J. Keaveney; S. Lowette; M. Maes; A. Olbrechts; Q. Python; D. Strom; S. Tavernier; W. Van Doninck; P. Van Mulders; G. P. Van Onsem; I. Villella; C. Caillol; B. Clerbaux; G. De Lentdecker; D. Dobur; L. Favart; A. P.R. Gay; A. Grebenyuk; A. Léonard; A. Mohammadi; L. Perniè; A. Randle-conde; T. Reis; T. Seva; L. Thomas; C. Vander Velde; P. Vanlaer; J. Wang; F. Zenoni; V. Adler; K. Beernaert; L. Benucci; A. Cimmino; S. Costantini; S. Crucy; S. Dildick; A. Fagot; G. Garcia; J. Mccartin; A. A. Ocampo Rios; D. Ryckbosch; S. Salva Diblen; M. Sigamani

doi:10.1038/nature14474

Observation of the rare B0<inf>s</inf>→μ+μ- decay from the combined analysis of CMS and LHCb data

V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, M. Friedl, R. Frühwirth, V. M. Ghete, C. Hartl, N. Hörmann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knünz, M. Krammer, I. Krätschmer, D. Liko, I. MikulecD. Rabady, B. Rahbaran, H. Rohringer, R. Schöfbeck, J. Strauss, W. Treberer-Treberspurg, W. Waltenberger, C. E. Wulz, V. Mossolov, N. Shumeiko, J. Suarez Gonzalez, S. Alderweireldt, S. Bansal, T. Cornelis, E. A. De Wolf, X. Janssen, A. Knutsson, J. Lauwers, S. Luyckx, S. Ochesanu, R. Rougny, M. Van De Klundert, H. Van Haevermaet, P. Van Mechelen, N. Van Remortel, A. Van Spilbeeck, F. Blekman, S. Blyweert, J. D'Hondt, N. Daci, N. Heracleous, J. Keaveney, S. Lowette, M. Maes, A. Olbrechts, Q. Python, D. Strom, S. Tavernier, W. Van Doninck, P. Van Mulders, G. P. Van Onsem, I. Villella, C. Caillol, B. Clerbaux, G. De Lentdecker, D. Dobur, L. Favart, A. P.R. Gay, A. Grebenyuk, A. Léonard, A. Mohammadi, L. Perniè, A. Randle-conde, T. Reis, T. Seva, L. Thomas, C. Vander Velde, P. Vanlaer, J. Wang, F. Zenoni, V. Adler, K. Beernaert, L. Benucci, A. Cimmino, S. Costantini, S. Crucy, S. Dildick, A. Fagot, G. Garcia, J. Mccartin, A. A. Ocampo Rios, D. Ryckbosch, S. Salva Diblen, M. Sigamani

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

292 Citations (Scopus)

Abstract

© 2015 Macmillan Publishers Limited. All rights reserved. The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strangeB meson (B0s ) andtheB0meson decaying into two oppositely charged muons (μ+ and μ-) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B0s→μ+μ- and B0s→μ+μ- decays are very rare, with about four of the former occurring for every billion B0s mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (CompactMuonSolenoid) andLHCb(LargeHadronCollider beauty) collaborations have performed a joint analysis of the data from proton'proton collisions that they collected in 2011 at a centre-ofmass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the B0s→μ+μ- decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the B0s→μ+μ- decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standardmodel. The LHCexperimentswill resume taking data in 2015, recording proton'proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of B0s and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.

Original language	English
Pages (from-to)	68-72
Number of pages	5
Journal	Nature
DOIs	https://doi.org/10.1038/nature14474
Publication status	Published - 4 Jun 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

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Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., Kiesenhofer, W., Knünz, V., Krammer, M., Krätschmer, I., Liko, D., ... Sigamani, M. (2015). Observation of the rare B0<inf>s</inf>→μ+μ- decay from the combined analysis of CMS and LHCb data. Nature, 68-72. https://doi.org/10.1038/nature14474

Khachatryan, V. ; Sirunyan, A. M. ; Tumasyan, A. ; Adam, W. ; Bergauer, T. ; Dragicevic, M. ; Erö, J. ; Friedl, M. ; Frühwirth, R. ; Ghete, V. M. ; Hartl, C. ; Hörmann, N. ; Hrubec, J. ; Jeitler, M. ; Kiesenhofer, W. ; Knünz, V. ; Krammer, M. ; Krätschmer, I. ; Liko, D. ; Mikulec, I. ; Rabady, D. ; Rahbaran, B. ; Rohringer, H. ; Schöfbeck, R. ; Strauss, J. ; Treberer-Treberspurg, W. ; Waltenberger, W. ; Wulz, C. E. ; Mossolov, V. ; Shumeiko, N. ; Suarez Gonzalez, J. ; Alderweireldt, S. ; Bansal, S. ; Cornelis, T. ; De Wolf, E. A. ; Janssen, X. ; Knutsson, A. ; Lauwers, J. ; Luyckx, S. ; Ochesanu, S. ; Rougny, R. ; Van De Klundert, M. ; Van Haevermaet, H. ; Van Mechelen, P. ; Van Remortel, N. ; Van Spilbeeck, A. ; Blekman, F. ; Blyweert, S. ; D'Hondt, J. ; Daci, N. ; Heracleous, N. ; Keaveney, J. ; Lowette, S. ; Maes, M. ; Olbrechts, A. ; Python, Q. ; Strom, D. ; Tavernier, S. ; Van Doninck, W. ; Van Mulders, P. ; Van Onsem, G. P. ; Villella, I. ; Caillol, C. ; Clerbaux, B. ; De Lentdecker, G. ; Dobur, D. ; Favart, L. ; Gay, A. P.R. ; Grebenyuk, A. ; Léonard, A. ; Mohammadi, A. ; Perniè, L. ; Randle-conde, A. ; Reis, T. ; Seva, T. ; Thomas, L. ; Vander Velde, C. ; Vanlaer, P. ; Wang, J. ; Zenoni, F. ; Adler, V. ; Beernaert, K. ; Benucci, L. ; Cimmino, A. ; Costantini, S. ; Crucy, S. ; Dildick, S. ; Fagot, A. ; Garcia, G. ; Mccartin, J. ; Ocampo Rios, A. A. ; Ryckbosch, D. ; Salva Diblen, S. ; Sigamani, M. / Observation of the rare B0<inf>s</inf>→μ+μ- decay from the combined analysis of CMS and LHCb data. In: Nature. 2015 ; pp. 68-72.

@article{66cc8cae97d644a8a9caa2c3bb7a8d66,

title = "Observation of the rare B0s→μ+μ- decay from the combined analysis of CMS and LHCb data",

abstract = "{\textcopyright} 2015 Macmillan Publishers Limited. All rights reserved. The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strangeB meson (B0s ) andtheB0meson decaying into two oppositely charged muons (μ+ and μ-) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B0s→μ+μ- and B0s→μ+μ- decays are very rare, with about four of the former occurring for every billion B0s mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (CompactMuonSolenoid) andLHCb(LargeHadronCollider beauty) collaborations have performed a joint analysis of the data from proton'proton collisions that they collected in 2011 at a centre-ofmass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the B0s→μ+μ- decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the B0s→μ+μ- decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standardmodel. The LHCexperimentswill resume taking data in 2015, recording proton'proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of B0s and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.",

author = "V. Khachatryan and Sirunyan, {A. M.} and A. Tumasyan and W. Adam and T. Bergauer and M. Dragicevic and J. Er{\"o} and M. Friedl and R. Fr{\"u}hwirth and Ghete, {V. M.} and C. Hartl and N. H{\"o}rmann and J. Hrubec and M. Jeitler and W. Kiesenhofer and V. Kn{\"u}nz and M. Krammer and I. Kr{\"a}tschmer and D. Liko and I. Mikulec and D. Rabady and B. Rahbaran and H. Rohringer and R. Sch{\"o}fbeck and J. Strauss and W. Treberer-Treberspurg and W. Waltenberger and Wulz, {C. E.} and V. Mossolov and N. Shumeiko and {Suarez Gonzalez}, J. and S. Alderweireldt and S. Bansal and T. Cornelis and {De Wolf}, {E. A.} and X. Janssen and A. Knutsson and J. Lauwers and S. Luyckx and S. Ochesanu and R. Rougny and {Van De Klundert}, M. and {Van Haevermaet}, H. and {Van Mechelen}, P. and {Van Remortel}, N. and {Van Spilbeeck}, A. and F. Blekman and S. Blyweert and J. D'Hondt and N. Daci and N. Heracleous and J. Keaveney and S. Lowette and M. Maes and A. Olbrechts and Q. Python and D. Strom and S. Tavernier and {Van Doninck}, W. and {Van Mulders}, P. and {Van Onsem}, {G. P.} and I. Villella and C. Caillol and B. Clerbaux and {De Lentdecker}, G. and D. Dobur and L. Favart and Gay, {A. P.R.} and A. Grebenyuk and A. L{\'e}onard and A. Mohammadi and L. Perni{\`e} and A. Randle-conde and T. Reis and T. Seva and L. Thomas and {Vander Velde}, C. and P. Vanlaer and J. Wang and F. Zenoni and V. Adler and K. Beernaert and L. Benucci and A. Cimmino and S. Costantini and S. Crucy and S. Dildick and A. Fagot and G. Garcia and J. Mccartin and {Ocampo Rios}, {A. A.} and D. Ryckbosch and {Salva Diblen}, S. and M. Sigamani",

year = "2015",

month = jun,

day = "4",

doi = "10.1038/nature14474",

language = "English",

pages = "68--72",

journal = "Nature",

issn = "0028-0836",

publisher = "Nature Publishing Group",

}

Khachatryan, V, Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Friedl, M, Frühwirth, R, Ghete, VM, Hartl, C, Hörmann, N, Hrubec, J, Jeitler, M, Kiesenhofer, W, Knünz, V, Krammer, M, Krätschmer, I, Liko, D, Mikulec, I, Rabady, D, Rahbaran, B, Rohringer, H, Schöfbeck, R, Strauss, J, Treberer-Treberspurg, W, Waltenberger, W, Wulz, CE, Mossolov, V, Shumeiko, N, Suarez Gonzalez, J, Alderweireldt, S, Bansal, S, Cornelis, T, De Wolf, EA, Janssen, X, Knutsson, A, Lauwers, J, Luyckx, S, Ochesanu, S, Rougny, R, Van De Klundert, M, Van Haevermaet, H, Van Mechelen, P, Van Remortel, N, Van Spilbeeck, A, Blekman, F, Blyweert, S, D'Hondt, J, Daci, N, Heracleous, N, Keaveney, J, Lowette, S, Maes, M, Olbrechts, A, Python, Q, Strom, D, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Onsem, GP, Villella, I, Caillol, C, Clerbaux, B, De Lentdecker, G, Dobur, D, Favart, L, Gay, APR, Grebenyuk, A, Léonard, A, Mohammadi, A, Perniè, L, Randle-conde, A, Reis, T, Seva, T, Thomas, L, Vander Velde, C, Vanlaer, P, Wang, J, Zenoni, F, Adler, V, Beernaert, K, Benucci, L, Cimmino, A, Costantini, S, Crucy, S, Dildick, S, Fagot, A, Garcia, G, Mccartin, J, Ocampo Rios, AA, Ryckbosch, D, Salva Diblen, S & Sigamani, M 2015, 'Observation of the rare B0<inf>s</inf>→μ+μ- decay from the combined analysis of CMS and LHCb data', Nature, pp. 68-72. https://doi.org/10.1038/nature14474

Observation of the rare B0<inf>s</inf>→μ+μ- decay from the combined analysis of CMS and LHCb data. / Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C. E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Knutsson, A.; Lauwers, J.; Luyckx, S.; Ochesanu, S.; Rougny, R.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; D'Hondt, J.; Daci, N.; Heracleous, N.; Keaveney, J.; Lowette, S.; Maes, M.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Caillol, C.; Clerbaux, B.; De Lentdecker, G.; Dobur, D.; Favart, L.; Gay, A. P.R.; Grebenyuk, A.; Léonard, A.; Mohammadi, A.; Perniè, L.; Randle-conde, A.; Reis, T.; Seva, T.; Thomas, L.; Vander Velde, C.; Vanlaer, P.; Wang, J.; Zenoni, F.; Adler, V.; Beernaert, K.; Benucci, L.; Cimmino, A.; Costantini, S.; Crucy, S.; Dildick, S.; Fagot, A.; Garcia, G.; Mccartin, J.; Ocampo Rios, A. A.; Ryckbosch, D.; Salva Diblen, S.; Sigamani, M.

In: Nature, 04.06.2015, p. 68-72.

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

TY - JOUR

T1 - Observation of the rare B0s→μ+μ- decay from the combined analysis of CMS and LHCb data

AU - Khachatryan, V.

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Bergauer, T.

AU - Dragicevic, M.

AU - Erö, J.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hartl, C.

AU - Hörmann, N.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Kiesenhofer, W.

AU - Knünz, V.

AU - Krammer, M.

AU - Krätschmer, I.

AU - Liko, D.

AU - Mikulec, I.

AU - Rabady, D.

AU - Rahbaran, B.

AU - Rohringer, H.

AU - Schöfbeck, R.

AU - Strauss, J.

AU - Treberer-Treberspurg, W.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Mossolov, V.

AU - Shumeiko, N.

AU - Suarez Gonzalez, J.

AU - Alderweireldt, S.

AU - Bansal, S.

AU - Cornelis, T.

AU - De Wolf, E. A.

AU - Janssen, X.

AU - Knutsson, A.

AU - Lauwers, J.

AU - Luyckx, S.

AU - Ochesanu, S.

AU - Rougny, R.

AU - Van De Klundert, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Van Spilbeeck, A.

AU - Blekman, F.

AU - Blyweert, S.

AU - D'Hondt, J.

AU - Daci, N.

AU - Heracleous, N.

AU - Keaveney, J.

AU - Lowette, S.

AU - Maes, M.

AU - Olbrechts, A.

AU - Python, Q.

AU - Strom, D.

AU - Tavernier, S.

AU - Van Doninck, W.

AU - Van Mulders, P.

AU - Van Onsem, G. P.

AU - Villella, I.

AU - Caillol, C.

AU - Clerbaux, B.

AU - De Lentdecker, G.

AU - Dobur, D.

AU - Favart, L.

AU - Gay, A. P.R.

AU - Grebenyuk, A.

AU - Léonard, A.

AU - Mohammadi, A.

AU - Perniè, L.

AU - Randle-conde, A.

AU - Reis, T.

AU - Seva, T.

AU - Thomas, L.

AU - Vander Velde, C.

AU - Vanlaer, P.

AU - Wang, J.

AU - Zenoni, F.

AU - Adler, V.

AU - Beernaert, K.

AU - Benucci, L.

AU - Cimmino, A.

AU - Costantini, S.

AU - Crucy, S.

AU - Dildick, S.

AU - Fagot, A.

AU - Garcia, G.

AU - Mccartin, J.

AU - Ocampo Rios, A. A.

AU - Ryckbosch, D.

AU - Salva Diblen, S.

AU - Sigamani, M.

PY - 2015/6/4

Y1 - 2015/6/4

N2 - © 2015 Macmillan Publishers Limited. All rights reserved. The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strangeB meson (B0s ) andtheB0meson decaying into two oppositely charged muons (μ+ and μ-) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B0s→μ+μ- and B0s→μ+μ- decays are very rare, with about four of the former occurring for every billion B0s mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (CompactMuonSolenoid) andLHCb(LargeHadronCollider beauty) collaborations have performed a joint analysis of the data from proton'proton collisions that they collected in 2011 at a centre-ofmass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the B0s→μ+μ- decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the B0s→μ+μ- decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standardmodel. The LHCexperimentswill resume taking data in 2015, recording proton'proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of B0s and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.

AB - © 2015 Macmillan Publishers Limited. All rights reserved. The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strangeB meson (B0s ) andtheB0meson decaying into two oppositely charged muons (μ+ and μ-) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B0s→μ+μ- and B0s→μ+μ- decays are very rare, with about four of the former occurring for every billion B0s mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (CompactMuonSolenoid) andLHCb(LargeHadronCollider beauty) collaborations have performed a joint analysis of the data from proton'proton collisions that they collected in 2011 at a centre-ofmass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the B0s→μ+μ- decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the B0s→μ+μ- decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standardmodel. The LHCexperimentswill resume taking data in 2015, recording proton'proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of B0s and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.

U2 - 10.1038/nature14474

DO - 10.1038/nature14474

M3 - Article

SP - 68

EP - 72

JO - Nature

JF - Nature

SN - 0028-0836

ER -

Observation of the rare B<sup>0</sup><inf>s</inf>→μ<sup>+</sup>μ<sup>-</sup> decay from the combined analysis of CMS and LHCb data

Abstract

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