Measurements of DirectCP-Violating Asymmetries in Charmless Decays of Bottom Baryons
T. Aaltonen,S. Amerio,D. Amidei,A. Anastassov,A. Annovi,J. Antoš,G. Apollinari,J. A. Appel,T. Arisawa,A. Artikov,J. Asaadi,W. Ashmanskas,B. Auerbach,A. Aurisano,F. Azfar,W. Badgett,T. Bae,A. Barbaro-Galtieri,V. E. Barnes,B. A. Barnett,P. Barria,P. Bartoš,M. Bauce,F. Bedeschi,S. Behari,G. Bellettini,J. Bellinger,D. Benjamin,A. Beretvas,A. Bhatti,K. R. Bland,B. Blumenfeld,A. Bocci,A. Bodek,D. Bortoletto,J. Boudreau,A. Boveia,L. Brigliadori,C. Bromberg,E. Brücken,J. Budagov,H. S. Budd,K. Burkett,G. Busetto,P. Bussey,P. Butti,A. Buzatu,A. Calamba,S. Camarda,M. Campanelli,F. Canelli,B. Carls,D. Carlsmith,R. Carosi,S. Carrillo,B. Casal,M. Casarsa,A. Castro,P. Catastini,D. Cauz,V. Cavaliere,M. Cavalli‐Sforza,A. Cerri,L. Cerrito,Y. C. Chen,M. Chertok,G. Chiarelli,G. Chlachidze,K. Cho,D. Chokheli,A. R. Clark,Christopher Clarke,M. E. Convery,J. Conway,M. Corbo,M. Cordelli,C. A. Cox,D. J. Cox,M. Cremonesi,D. Cruz,J. Cuevas,R. Culbertson,N. D’Ascenzo,M. Datta,P. de Barbaro,L. Demortier,M. Deninno,M. D’Errico,F. Devoto,A. Di Canto,B. Di Ruzza,J. Dittmann,S. Donati,M. D’Onofrio,M. Dorigo,A. Driutti,K. Ebina,R. C. Edgar,A. Elagin,R. Erbacher,S. Errede,B. Esham,S. M. Farrington,J. P. Fernández Ramos,R. D. Field,G. Flanagan,R. Forrest,M. Franklin,J. Freeman,H. Frisch,Y. Funakoshi,C. Galloni,A. F. Garfinkel,P. Garosi,H. Gerberich,E. Gerchtein,S. Giagu,V. A. Giakoumopoulou,K. Gibson,C. M. Ginsburg,N. Giokaris,P. Giromini,G. Giurgiu,V. Glagolev,D. Glenzinskí,M. Gold,D. Goldin,A. Golossanov,G. Gómez,G. Gómez-Ceballos,M. Goncharov,O. González López,I. Gorelov,A. T. Goshaw,K. Goulianos,E. Gramellini,S. Grinstein,C. Grosso-Pilcher,R. C. Group,J. Guimarães da Costa,S. R. Hahn,J. Han,F. Happacher,K. Hara,M. Hare,R. Harr,T. Harrington-Taber,K. Hatakeyama,C. P. Hays,J. Heinrich,M. Herndon,A. Höcker,Z. Hong,W. H. Hopkins,S. Hou,R. Hughes,U. Husemann,M. Jahjah Hussein,J. Huston,G. Introzzi,M. Iori,A. Ivanov,E. James,D. Jang,B. Jayatilaka,E. J. Jeon,S. Jindariani,M. Jones,K. K. Joo,S. Y. Jun,T. R. Junk,M. Kambeitz,T. Kamon,P. E. Karchin,A. Kasmi,Y. Kato,W. Ketchum,J. Keung,B. Kilminster,D. H. Kim,H. S. Kim,J. E. Kim,M. J. Kim,S. H. Kim,S. B. Kim,Y. J. Kim,Y. K. Kim,N. Kimura,M. Kirby,K. J. Knoepfel,K. Kondo,D. J. Kong,J. Königsberg,A. Kotwal,M. Kreps,J. Kroll,M. Kruse,T. Kuhr,M. Kurata,A. T. Laasanen,S. Lammel,M. Lancaster,K. Lannon,G. Latino,H. S. Lee,J. S. Lee,S. Leo,S. Leone,J. D. Lewis,A. Limosani,E. Lipeles,A. Lister,H. Liu,Q. Liu,T. Liu,S. Lockwitz,A. Loginov,D. Lucchesi,Andrea Di Luca,J. Lueck,P. Lujan,P. Lukens,G. Lungu,J. Lys,R. Lysák,R. Madrak,P. Maestro,S. Malik,G. Manca,A. Manousakis-Katsikakis,L. Marchese,F. Margaroli,P. Marino,M. Lucio Martínez,K. Matera,M. E. Mattson,A. Mazzacane,P. Mazzanti,R. McNulty,A. Mehta,P. Mehtälä,C. Mesropian,T. Miao,D. Mietlicki,A. Mitra,H. Miyake,S. Moëd,N. Moggi,C. S. Moon,R. W. Moore,M. J. Morello,A. Mukherjee,Th. Müller,P. Murat,M. Mussini,J. Nachtman,Y. Nagai,J. Naganoma,I. Nakano,A. Napier,J. Nett,C. Neu,T. Nigmanov,L. Nodulman,S. Y. Noh,O. Norniella,L. Oakes,S. H. Oh,Y. D. Oh,I. Oksuzian,T. Okusawa,R. Orava,L. Ortolan,C. Pagliarone,E. Palencia,P. Palni,V. Papadimitriou,W. Parker,G. Pauletta,M. Paulini,C. Paus,T. J. Phillips,G. Piacentino,E. Pianori,J. Pilot,K. Pitts,C. Plager,L. Pondrom,S. Poprocki,K. Potamianos,A. Pranko,F. Prokoshin,F. Ptohos,G. Punzi,N. Ranjan,I. Redondo,P. Renton,M. Rescigno,F. Rimondi,L. Ristori,A. Robson,T. Rodriguez,S. Rolli,M. Ronzani,R. Roser,Jonathan L. Rosner,F. Ruffini,A. Ruiz,J. Russ,V. Rusu,W. K. Sakumoto,Y. Sakurai,L. Santi,K. Sato,V. Saveliev,A. Savoy-Navarro,P. Schlabach,E. E. Schmidt,Thomas Schwarz,L. Scodellaro,F. Scuri,S. C. Seidel,Y. Seiya,A. Semenov,F. Sforza,S. Shalhout,T. Shears,P. F. Shepard,M. Shimojima,M. Shochet,I. Shreyber-Tecker,А. Симоненко,K. Sliwa,J. Smith,F. D. Snider,H. Y. Song,V. Sorı́n,R. St. Denis,M. Stancari,D. Stentz,J. Strologas,Y. Sudo,А. Суханов,И. Суслов,K. Takemasa,Y. Takeuchi,J. Tang,M. Tecchio,P. K. Teng,J. Thom,E. Thomson,V. Thukral,D. Toback,S. Tokár,K. Tollefson,T. Tomura,D. Tonelli,S. Torre,D. Torretta,P. Totaro,M. Trovato,F. Ukegawa,S. Uozumi,F. Vázquez,G. Velev,C. Vellidis,C. Vernieri,M. Vidal,R. Vilar,J. Vizán,M. Vogel,G. Volpi,P. Wagner,R. Wallny,S. M. Wang,D. Waters,W. C. Wester,D. Whiteson,A. B. Wicklund,S. Wilbur,H. H. Williams,J. S. Wilson,P. Wilson,B. L. Winer,P. Wittich,S. Wolbers,H. Wolfe,T. Wright,X. Wu,Z. Wu,K. Yamamoto,D. Yamato,Tong-Zhi Yang,U. K. Yang,Youhua Yang,Wei-Ming Yao,G. P. Yeh,K. Yi,J. Yoh,K. Yorita,T. Yoshida,G. B. Yu,I. Yu,A. Zanetti,Yun Zeng,C. Zhou,S. Zucchelli
Physical Review Letters(2014)
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摘要
We report final measurements of direct $\mathit{CP}$--violating asymmetries in charmless decays of neutral bottom hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using the complete $\sqrt{s}=1.96$ TeV proton-antiproton collisions data set, corresponding to 9.3 fb$^{-1}$ of integrated luminosity, we measure $\mathcal{A}(\Lambda^0_b \rightarrow p\pi^{-}) = +0.06 \pm 0.07\mathrm{(stat)} \pm 0.03\mathrm{(syst)}$ and $\mathcal{A}(\Lambda^0_b \rightarrow pK^{-}) = -0.10 \pm 0.08\mathrm{(stat)} \pm 0.04\mathrm{(syst)}$, compatible with no asymmetry. In addition we measure the $\mathit{CP}$--violating asymmetries in $B^0_s \rightarrow K^{-}\pi^{+}$ and $B^0 \rightarrow K^{+}\pi^{-}$ decays to be $\mathcal{A}(B^0_s \rightarrow K^{-}\pi^{+}) = +0.22 \pm 0.07\mathrm{stat)} \pm 0.02\mathrm{(syst)}$ and $\mathcal{A}(B^0 \rightarrow K^{+}\pi^{-}) = -0.083\pm 0.013 \mathrm{(stat)} \pm 0.004\mathrm{(syst)}$, respectively, which are significantly different from zero and consistent with current world averages.