학술논문

First measurement of the charge asymmetry in beauty-quark pair production at a hadron collider
Document Type
Working Paper
Author
Aaij, R.Adeva, B.Adinolfi, M.Affolder, A.Ajaltouni, Z.Akar, S.Albrecht, J.Alessio, F.Alexander, M.Ali, S.Alkhazov, G.Cartelle, P. AlvarezAlves Jr, A. A.Amato, S.Amerio, S.Amhis, Y.An, L.Anderlini, L.Anderson, J.Andreassen, R.Andreotti, M.Andrews, J. E.Appleby, R. B.Gutierrez, O. AquinesArchilli, F.Artamonov, A.Artuso, M.Aslanides, E.Auriemma, G.Baalouch, M.Bachmann, S.Back, J. J.Badalov, A.Balagura, V.Baldini, W.Barlow, R. J.Barschel, C.Barsuk, S.Barter, W.Batozskaya, V.Battista, V.Bay, A.Beaucourt, L.Beddow, J.Bedeschi, F.Bediaga, I.Belogurov, S.Belous, K.Belyaev, I.Ben-Haim, E.Bencivenni, G.Benson, S.Benton, J.Berezhnoy, A.Bernet, R.Bettler, M. -O.van Beuzekom, M.Bien, A.Bifani, S.Bird, T.Bizzeti, A.Bjørnstad, P. M.Blake, T.Blanc, F.Blouw, J.Blusk, S.Bocci, V.Bondar, A.Bondar, N.Bonivento, W.Borghi, S.Borgia, A.Borsato, M.Bowcock, T. J. V.Bowen, E.Bozzi, C.Brambach, T.Brand, J. van denBressieux, J.Brett, D.Britsch, M.Britton, T.Brodzicka, J.Brook, N. H.Brown, H.Bursche, A.Busetto, G.Buytaert, J.Cadeddu, S.Calabrese, R.Calvi, M.Gomez, M. CalvoCamboni, A.Campana, P.Perez, D. CamporaCarbone, A.Carboni, G.Cardinale, R.Cardini, A.Carranza-Mejia, H.Carson, L.Akiba, K. CarvalhoCasse, G.Cassina, L.Garcia, L. CastilloCattaneo, M.Cauet, Ch.Cenci, R.Charles, M.Charpentier, Ph.Chen, S.Cheung, S. -F.Chiapolini, N.Chrzaszcz, M.Ciba, K.Vidal, X. CidCiezarek, G.Clarke, P. E. L.Clemencic, M.Cliff, H. V.Closier, J.Coco, V.Cogan, J.Cogneras, E.Collins, P.Comerma-Montells, A.Contu, A.Cook, A.Coombes, M.Coquereau, S.Corti, G.Corvo, M.Counts, I.Couturier, B.Cowan, G. A.Craik, D. C.Torres, M. CruzCunliffe, S.Currie, R.D'Ambrosio, C.Dalseno, J.David, P.David, P. N. Y.Davis, A.De Bruyn, K.De Capua, S.De Cian, M.De Miranda, J. M.De Paula, L.De Silva, W.De Simone, P.Decamp, D.Deckenhoff, M.Del Buono, L.Déléage, N.Derkach, D.Deschamps, O.Dettori, F.Di Canto, A.Dijkstra, H.Donleavy, S.Dordei, F.Dorigo, M.Suárez, A. DosilDossett, D.Dovbnya, A.Dreimanis, K.Dujany, G.Dupertuis, F.Durante, P.Dzhelyadin, R.Dziurda, A.Dzyuba, A.Easo, S.Egede, U.Egorychev, V.Eidelman, S.Eisenhardt, S.Eitschberger, U.Ekelhof, R.Eklund, L.Rifai, I. ElElsasser, Ch.Ely, S.Esen, S.Evans, H. -M.Evans, T.Falabella, A.Färber, C.Farinelli, C.Farley, N.Farry, S.Fay, RFFerguson, D.Albor, V. FernandezRodrigues, F. FerreiraFerro-Luzzi, M.Filippov, S.Fiore, M.Fiorini, M.Firlej, M.Fitzpatrick, C.Fiutowski, T.Fontana, M.Fontanelli, F.Forty, R.Francisco, O.Frank, M.Frei, C.Frosini, M.Fu, J.Furfaro, E.Torreira, A. GallasGalli, D.Gallorini, S.Gambetta, S.Gandelman, M.Gandini, P.Gao, Y.Pardiñas, J. GarcíaGarofoli, J.Tico, J. GarraGarrido, L.Gaspar, C.Gauld, R.Gavardi, L.Gavrilov, G.Gersabeck, E.Gersabeck, M.Gershon, T.Ghez, Ph.Gianelle, A.Giani', S.Gibson, V.Giubega, L.Gligorov, V. V.Göbel, C.Golubkov, D.Golutvin, A.Gomes, A.Gordon, H.Gotti, C.Gándara, M. GrabalosaDiaz, R. GracianiCardoso, L. A. GranadoGraugés, E.Graziani, G.Grecu, A.Greening, E.Gregson, S.Griffith, P.Grillo, L.Grünberg, O.Gui, B.Gushchin, E.Guz, Yu.Gys, T.Hadjivasiliou, C.Haefeli, G.Haen, C.Haines, S. C.Hall, S.Hamilton, B.Hampson, T.Han, X.Hansmann-Menzemer, S.Harnew, N.Harnew, S. T.Harrison, J.He, J.Head, T.Heijne, V.Hennessy, K.Henrard, P.Henry, L.Morata, J. A. Hernandovan Herwijnen, E.Heß, M.Hicheur, A.Hill, D.Hoballah, M.Hombach, C.Hulsbergen, W.Hunt, P.Hussain, N.Hutchcroft, D.Hynds, D.Idzik, M.Ilten, P.Jacobsson, R.Jaeger, A.Jalocha, J.Jans, E.Jaton, P.Jawahery, A.Jing, F.John, M.Johnson, D.Jones, C. R.Joram, C.Jost, B.Jurik, N.Kaballo, M.Kandybei, S.Kanso, W.Karacson, M.Karbach, T. M.Karodia, S.Kelsey, M.Kenyon, I. R.Ketel, T.Khanji, B.Khurewathanakul, C.Klaver, S.Klimaszewski, K.Kochebina, O.Kolpin, M.Komarov, I.Koopman, R. F.Koppenburg, P.Korolev, M.Kozlinskiy, A.Kravchuk, L.Kreplin, K.Kreps, M.Krocker, G.Krokovny, P.Kruse, F.Kucewicz, W.Kucharczyk, M.Kudryavtsev, V.Kurek, K.Kvaratskheliya, T.La Thi, V. N.Lacarrere, D.Lafferty, G.Lai, A.Lambert, D.Lambert, R. W.Lanciotti, E.Lanfranchi, G.Langenbruch, C.Langhans, B.Latham, T.Lazzeroni, C.Gac, R. Levan Leerdam, J.Lees, J. -P.Lefèvre, R.Leflat, A.Lefrançois, J.Leo, S.Leroy, O.Lesiak, T.Leverington, B.Li, Y.Liles, M.Lindner, R.Linn, C.Lionetto, F.Liu, B.Liu, G.Lohn, S.Longstaff, I.Lopes, J. H.Lopez-March, N.Lowdon, P.Lu, H.Lucchesi, D.Luo, H.Lupato, A.Luppi, E.Lupton, O.Machefert, F.Machikhiliyan, I. V.Maciuc, F.Maev, O.Malde, S.Manca, G.Mancinelli, G.Maratas, J.Marchand, J. F.Marconi, U.Benito, C. MarinMarino, P.Märki, R.Marks, J.Martellotti, G.Martens, A.Sánchez, A. MartínMartinelli, M.Santos, D. MartinezVidal, F. MartinezTostes, D. MartinsMassafferri, A.Matev, R.Mathe, Z.Matteuzzi, C.Mazurov, A.McCann, M.McCarthy, J.McNab, A.McNulty, R.McSkelly, B.Meadows, B.Meier, F.Meissner, M.Merk, M.Milanes, D. A.Minard, M. -N.Moggi, N.Rodriguez, J. MolinaMonteil, S.Morandin, M.Morawski, P.Mordà, A.Morello, M. J.Moron, J.Morris, A. -B.Mountain, R.Muheim, F.Müller, K.Muresan, R.Mussini, M.Muster, B.Naik, P.Nakada, T.Nandakumar, R.Nasteva, I.Needham, M.Neri, N.Neubert, S.Neufeld, N.Neuner, M.Nguyen, A. D.Nguyen, T. D.Nguyen-Mau, C.Nicol, M.Niess, V.Niet, R.Nikitin, N.Nikodem, T.Novoselov, A.O'Hanlon, D. P.Oblakowska-Mucha, A.Obraztsov, V.Oggero, S.Ogilvy, S.Okhrimenko, O.Oldeman, R.Onderwater, G.Orlandea, M.Goicochea, J. M. OtaloraOwen, P.Oyanguren, A.Pal, B. K.Palano, A.Palombo, F.Palutan, M.Panman, J.Papanestis, A.Pappagallo, M.Parkes, C.Parkinson, C. J.Passaleva, G.Patel, G. D.Patel, M.Patrignani, C.Alvarez, A. PazosPearce, A.Pellegrino, A.Altarelli, M. PepePerazzini, S.Trigo, E. 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Source
Phys. Rev. Lett. 113, 082003 (2014)
Subject
High Energy Physics - Experiment
Language
Abstract
The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in $b\bar{b}$ pair production at a hadron collider. The data used correspond to an integrated luminosity of 1.0fb$^{-1}$ collected at 7TeV center-of-mass energy in proton-proton collisions with the LHCb detector. The measurement is performed in three regions of the invariant mass of the $b\bar{b}$ system. The results obtained are: \begin{eqnarray} A_{C}^{b\bar{b}}(40 < M_{b\bar{b}} < 75\,\rm{GeV/c^2}) &=& 0.4 \pm 0.4(\rm{stat}) \pm 0.3(\rm{syst})\%\newline A_{C}^{b\bar{b}}(75 < M_{b\bar{b}} < 105\,\rm{GeV/c^2}) &=& 2.0 \pm 0.9(\rm{stat}) \pm 0.6(\rm{syst})\%\newline A_{C}^{b\bar{b}}(M_{b\bar{b}} > 105\,\rm{GeV/c^2}) &=&1.6 \pm 1.7(\rm{stat}) \pm 0.6(\rm{syst})\% \end{eqnarray} where $A_{C}^{b\bar{b}}$ is defined as the asymmetry in the difference in rapidity between jets formed from the beauty quark and antiquark. The beauty jets are required to satisfy $2<\eta<4$, $E_{\rm T} > 20$GeV, and have an opening angle in the transverse plane $\Delta\phi>2.6$rad. These measurements are consistent with the predictions of the Standard Model.