A Measurement of the CP Asymmetry Difference between Λ[subscript c][superscript +] → PK[superscript −]K[superscript +] and Pπ[superscript −]π[superscript +] Decays

Abstract: The difference between the CP asymmetries in the decays Λ [superscript +][subscript c] → pK[superscript −]K[superscript +] and Λ [superscript +][subscript c] → pπ[superscript −]π[superscript +] is presented. Proton-proton collision data taken at centre-of-mass energies of 7 and 8 TeV col...

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Main Authors: Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A, Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J. E, Appleby, R. B, Archilli, F., d’Argent, P., Arnau Romeu, J., Artamonov, A., Artuso, M., Aslanides, E., Atzeni, M., Auriemma, G., Baalouch, M., Babuschkin, I., Bachmann, S., Back, J. J, Badalov, A., Baesso, C., Baker, S., Balagura, V., Baldini, W., Baranov, A., Barlow, R. J, Barschel, C., Barsuk, S., Barter, W., Baryshnikov, F., Batozskaya, V., Battista, V., Bay, A., Beaucourt, L., Beddow, J., Bedeschi, F., Bediaga, I., Beiter, A., Bel, L. J, 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, M. O, van Beuzekom, M., Bezshyiko, Ia., Bifani, S., Billoir, P., Birnkraut, A., Bizzeti, A., Bjørn, M., Blake, T., Blanc, F., Blusk, S., Bocci, V., Bondar, A., Bondar, N., Bordyuzhin, I., Borghi, S., Borisyak, M., Borsato, M., Bossu, F., Boubdir, M., Bowcock, T. J V, Bowen, E., Bozzi, C., Braun, S., Brodzicka, J., Brundu, D., Buchanan, E., Burr, C., Bursche, A., Buytaert, J., Byczynski, W., Cadeddu, S., Cai, H., Calabrese, R., Calladine, R., Calvi, M., Calvo Gomez, M., Camboni, A., Campana, P., Campora Perez, D. H, Capriotti, L., Carbone, A., Carboni, G., Cardinale, R., Cardini, A., Carniti, P., Carson, L., Carvalho Akiba, K., Casse, G., Cassina, L., Cattaneo, M., Cavallero, G., Cenci, R., Chamont, D., Chapman, M. G, Charles, M., Charpentier, Ph., Chatzikonstantinidis, G., Chefdeville, M., Chen, S., Cheung, S. F, Chitic, S.-G., Chobanova, V., Chrzaszcz, M., Chubykin, A., Ciambrone, P., Cid Vidal, X., Ciezarek, G., Clarke, P. E L, Clemencic, M., Cliff, H. V, Closier, J., Coco, V., Cogan, J., Cogneras, E., Cogoni, V., Cojocariu, L., Collins, P., Colombo, T., Comerma-Montells, A., Contu, A., Coombs, G., Coquereau, S., Corti, G., Corvo, M., Costa Sobral, C. M, Couturier, B., Cowan, G. A, Crocombe, A., Cruz Torres, M., Currie, R., D’Ambrosio, C., Da Cunha Marinho, F., Da Silva, C. L, Dall’Occo, E., Dalseno, J., Davis, A., De Aguiar Francisco, O., De Bruyn, K., De Capua, S., De Cian, M., De Miranda, J. M, De Paula, L., De Serio, M., De Simone, P., Dean, C. T, Decamp, D., Del Buono, L., Dembinski, H.-P., Demmer, M., Dendek, A., Derkach, D., Deschamps, O., Dettori, F., Dey, B., Di Canto, A., Di Nezza, P., Dijkstra, H., Dordei, F., Dorigo, M., Dosil Suárez, A., Douglas, L., Dovbnya, A., Dreimanis, K., Dufour, L., Dujany, G., Durante, P., Durham, J. M, Dutta, D., Dzhelyadin, R., Dziewiecki, M., Dziurda, A., Dzyuba, A., Easo, S., Ebert, M., Egede, U., Egorychev, V., Eidelman, S., Eisenhardt, S., Eitschberger, U., Ekelhof, R., Eklund, L., Ely, S., Esen, S., Evans, H. M, Evans, T., Falabella, A., Farley, N., Farry, S., Fazzini, D., Federici, L., Ferguson, D., Fernandez, G., Fernandez Declara, P., Fernandez Prieto, A., Ferrari, F., Ferreira Lopes, L., Ferreira Rodrigues, F., Ferro-Luzzi, M., Filippov, S., Fini, R. A, Fiorini, M., Firlej, M., Fitzpatrick, C., Fiutowski, T., Fleuret, F., Fontana, M., Fontanelli, F., Forty, R., Franco Lima, V., Frank, M., Frei, C., Fu, J., Funk, W., Furfaro, E., Färber, C., Gabriel, E., Gallas Torreira, A., Galli, D., Gallorini, S., Gambetta, S., Gandelman, M., Gandini, P., Gao, Y., Garcia Martin, L. M, García Pardiñas, J., Garra Tico, J., Garrido, L., Gascon, D., Gaspar, C., Gavardi, L., Gazzoni, G., Gerick, D., Gersabeck, E., Gersabeck, M., Gershon, T., Ghez, Ph., Gianì, S., Gibson, V., Girard, O. G, Giubega, L., Gizdov, K., Gligorov, V. V, Golubkov, D., Golutvin, A., Gomes, A., Gorelov, I. V, Gotti, C., Govorkova, E., Grabowski, J. P, Graciani Diaz, R., Granado Cardoso, L. A, Graugés, E., Graverini, E., Graziani, G., Grecu, A., Greim, R., Griffith, P., Grillo, L., Gruber, L., Gruberg Cazon, B. R, Grünberg, O., Gushchin, E., Guz, Yu., Gys, T., Göbel, C., Hadavizadeh, T., Hadjivasiliou, C., Haefeli, G., Haen, C., Haines, S.C., Hamilton, B., Han, X., Hancock, T. H, Hansmann-Menzemer, S., Harnew, N., Harnew, S. T, Hasse, C., Hatch, M., He, J., Hecker, M., Heinicke, K., Heister, A., Hennessy, K., Henrard, P., Henry, L., van Herwijnen, E., Heß, M., Hicheur, A., Hill, D., Hopchev, P. H, Hu, W., Huang, W., Huard, Z. C, Hulsbergen, W., Humair, T., Hushchyn, M., Hutchcroft, D., Ibis, P., Idzik, M., Ilten, P., Jacobsson, R., Jalocha, J., Jans, E., Jawahery, A., Jiang, F., John, M., Johnson, D., Jones, C. R, Joram, C., Jost, B., Jurik, N., Kandybei, S., Karacson, M., Kariuki, J. M, Karodia, S., Kazeev, N., Kecke, M., Keizer, F., Kelsey, M., Kenzie, M., Ketel, T., Khairullin, E., Khanji, B., Khurewathanakul, C., Kirn, T., Klaver, S., Klimaszewski, K., Klimkovich, T., Koliiev, S., Kolpin, M., Kopecna, R., Koppenburg, P., Kosmyntseva, A., Kotriakhova, S., Kozeiha, M., Kravchuk, L., Kreps, M., Kress, F., Krokovny, P., Krzemien, W., Kucewicz, W., Kucharczyk, M., Kudryavtsev, V., Kuonen, A. K, Kvaratskheliya, T., Lacarrere, D., Lafferty, G., Lai, A., Lanfranchi, G., Langenbruch, C., Latham, T., Lazzeroni, C., Le Gac, R., Leflat, A., Lefrançois, J., Lefèvre, R., Lemaitre, F., Lemos Cid, E., Leroy, O., Lesiak, T., Leverington, B., Li, P.-R., Li, T., Li, Y., Li, Z., Liang, X., Likhomanenko, T., Lindner, R., Lionetto, F., Lisovskyi, V., Liu, X., Loh, D., Loi, A., Longstaff, I., Lopes, J. 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B, Mountain, R., Muheim, F., Mulder, M., Müller, D., Müller, J., Müller, K., Müller, V., Naik, P., Nakada, T., Nandakumar, R., Nandi, A., Nasteva, I., Needham, M., Neri, N., Neubert, S., Neufeld, N., Neuner, M., Nguyen, T. D, Nguyen-Mau, C., Nieswand, S., Niet, R., Nikitin, N., Nikodem, T., Nogay, A., O’Hanlon, D. P, Oblakowska-Mucha, A., Obraztsov, V., Ogilvy, S., Oldeman, R., Onderwater, C. J G, Ossowska, A., Otalora Goicochea, J. M, Owen, P., Oyanguren, A., Pais, P. R, Palano, A., Palutan, M., Papanestis, A., Pappagallo, M., Pappalardo, L. 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A, Wyllie, K., Xie, Y., Xu, M., Xu, Q., Xu, Z., Yang, Z., Yao, Y., Yin, H., Yu, J., Yuan, X., Yushchenko, O., Zarebski, K. A, Zavertyaev, M., Zhang, L., Zhang, Y., Zhelezov, A., Zheng, Y., Zhu, X., Zhukov, V., Zonneveld, J. B, Zucchelli, S., Boettcher, Thomas Julian, Craik, Daniel C, Weisser, Constantin, Williams, Michael
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: Springer Berlin Heidelberg 2018
Online Access:http://hdl.handle.net/1721.1/116637
https://orcid.org/0000-0002-3684-1560
https://orcid.org/0000-0001-8285-3346
Description
Summary:Abstract: The difference between the CP asymmetries in the decays Λ [superscript +][subscript c] → pK[superscript −]K[superscript +] and Λ [superscript +][subscript c] → pπ[superscript −]π[superscript +] is presented. Proton-proton collision data taken at centre-of-mass energies of 7 and 8 TeV collected by the LHCb detector in 2011 and 2012 are used, corresponding to an integrated luminosity of 3 fb[superscript −1]. The Λ[superscript +][subscript c] candidates are reconstructed as part of the Λ[superscript 0] [subscript b] → Λ[superscript +][subscript c] µ[superscript −]X decay chain. In order to maximize the cancellation of production and detection asymmetries in the difference, the final-state kinematic distributions of the two samples are aligned by applying phase-space-dependent weights to the Λ[superscript +][subscript c] → pπ[superscript −]π[superscript +] sample. This alters the definition of the integrated CP asymmetry to A[superscript wgt][subscript CP] (pπ[superscript −]π[superscript +]). Both samples are corrected for reconstruction and selection efficiencies across the five-dimensional Λ[superscript +][subscript c] decay phase space. The difference in CP asymmetries is found to be ∆A[superscript wgt][subscript CP] = ACP (pK[superscript −]K[superscript +]) − A[superscript wgt][subscript CP] (pπ[superscript −]π[superscript +]) = (0.30 ± 0.91 ± 0.61) %, where the first uncertainty is statistical and the second is systematic. Keywords: Charm physics, CP violation, Flavor physics, Hadron-Hadron scattering (experiments