123 research outputs found
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Procedures for application of Don Cossairt's CASIM calculations in TM-1140 to bulk shielding
No full textAs part of the methodology documentation for the site-wide radiation shielding assessment, these two related notes were written showing how to apply the CASIM calculations of TM-1140 to determine required shielding for various beam intensities and steel-soil composites. These notes have been reviewed by the Fermilab ES H Section and approved for use in evaluating shielding requirements
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Charm photoproduction dynamics
No full textPhotoproduction of open charm is reviewed, both as a tool for studying the properties of charm particles such as spectroscopy, decays, and lifetimes, and as a testing ground for theoretical calculations of production dynamics. Many characteristics of charm photoproduction are described in terms of the leading order (LO) {alpha}{sub EM}{alpha}{sub S} Photon-Gluon Fusion (PGF) model. The next-to-leading order (NLO) corrections of strength {alpha}{sub EM}{alpha}{sub S}{sup 2} due to radiation of additional gluons are then added. The sensitivities of the NLO calculations on the mass of the charm quark, m{sub c}, and on the choice of the gluon structure function of the nucleon are illustrated for the energy dependence of the cross section for charm photoproduction. These are compared with fixed target data and new HERA data. The single charm particle inclusive distributions in x{sub f} and p{sub {perpendicular}}{sup 2}, along with {sigma}({gamma}N {yields} c{anti c}X) give good estimates of m{sub c} and n{sub g}, the shape parameter for the gluon distribution within the nucleon. As in hadroproduction, some disagreements between prediction and observation begin to appear in trying to simultaneously match the distributions in both p{sub {perpendicular}}{sup 2} for single charm particles and in the {Delta}{Phi} acoplanarity angle between pairs of charm particles. These can be partially remedied by modifying the fragmentation function for c-quarks into charm particles, and by including extra k{sub {perpendicular}}{sup 2} transverse smearing of the gluon distributions within the target nucleon. Initial studies of the relative production between charm particles and anti-particles indicate disagreement with the predictions of the independent string fragmentation model
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Fixed Target Beauty Physics Experimental Programs
No full textThe current and near term future fixed target physics efforts in observing particles with open beauty are reviewed. This includes a compilation of the non-observation upper limits and the observation of both upsilon and b-states. A short discussion of the theoretical predictions for the hadro-produced beauty pairs is included. The major part of this review is devoted to the techniques and tricks employed, a survey of the current and proposed experiments. A personal summary of the experimental prospects concludes this report. 28 refs., 26 figs
Effects of potting on training and quench propagation in a large stored energy superconducting dipole coil
No full textA superconducting racetrack dipole coil was constructed to compare directly training and quench behavior in potted and non-potted coils. The stored energy of this coil was 175 KJoules at the conductor's short sample limit of 238 Amp with a peak field on the coil of 7.6 Tesla. The outward magnetic forces were restrained by rows of tie rods between side plates. Comparisons of training behavior were made for both steel and aluminum tie rods. Helium flow was provided by channels in the fiberglass cable tape allowing 1/4 of the conductor direct access to the helium supply. After training the coil to 90% of short sample limit, the tie rods were relaxed and the entire coil was vacuum impregnated with a standard clear magnet epoxy. After potting, the previous tie rod preloads were re-established. This resulted in a much shallower training curve, and required retraining after thermal cycling. The unpotted coil showed no evidence of internal quench propagation below 80% short sample, whereas the potted coil exhibited good quench propagation and energy dissipation at all currents, simplifying protection strategies. Fully impregnated coils of this design are not practical for thermally cycled magnets designed to operate above 80% of short sample limit
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Measurement of spin correlation between and antitop quarks produced in p¯p collisions at √s=1.96 TeV
No full textWe present a measurement of the correlation between the spins of t and t quarks produced in proton–
antiproton collisions at the Tevatron Collider at a center-of-mass energy of 1.96 TeV. We apply a matrix
element technique to dilepton and single-lepton+jets final states in data accumulated with the D0 detector
that correspond to an integrated luminosity of 9.7 fb⁻¹. The measured value of the correlation
coefficient in the off-diagonal basis, 0ₒff = 0.89 ± 0.22 (stat + syst), is in agreement with the standard
model prediction, and represents evidence for a top–antitop quark spin correlation difference from zero
at a level of 4.2 standard deviations
STUDY OF D(0)->K(S)0-PI+PI- AND D(0)->K(S)0K+K- IN HIGH-ENERGY PHOTOPRODUCTION
No full textAnalysis of the resonant and non-resonant branching fractions for the decays D0→KS0π+π−and D0→KS0K+K− is presented. For the D0→KS0π+π− decay, a fit to the observed Dalitz plot was performed to determine the complex amplitudes of the sub-component modes. For the D0→KS0K+K− decay, measurements of the branching ratios D0→KS0K+K− (inclusive), D0→KS0φ, and D0→KS0(K+K−)non-φ relative to the D0→KS0π+π− mode are reported. The data were collected by the Fermilab high energy photoproduction experiment E687
Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron
No full textMinistry of Science and Innovation, and the Consolider-Ingenio 2010 Program (Spain)Aaltonen, T., Abazov, V.M., Abbott, B., Acharya, B.S., Adams, M., Adams, T., Agnew, J.P., Alexeev, G.D., Alkhazov, G., Alton, A., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Apollinari, G., Appel, J.A., Arisawa, T., Artikov, A., Asaadi, J., Ashmanskas, W., Askew, A., Atkins, S., Auerbach, B., Augsten, K., Aurisano, A., Aushev, V., Aushev, Y., Avila, C., Azfar, F., Badaud, F., Badgett, W., Bae, T., Bagby, L., Baldin, B., Bandurin, D.V., Banerjee, S., Barbaro-Galtieri, A., Barberis, E., Baringer, P., Barnes, V.E., Barnett, B.A., Barria, P., Bartlett, J.F., Bartos, P., Bassler, U., Bauce, M., Bazterra, V., Bean, A., Bedeschi, F., Begalli, M., Behari, S., Bellantoni, L., Bellettini, G., Bellinger, J., Benjamin, D., Beretvas, A., Beri, S.B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Beuselinck, R., Bhat, P.C., Bhatia, S., Bhatnagar, V., Bhatti, A., Bland, K.R., Blazey, G., Blessing, S., Bloom, K., Blumenfeld, B., Bocci, A., Bodek, A., Boehnlein, A., Boline, D., Boos, E.E., Borissov, G., Bortoletto, D., Borysova, M., Boudreau, J., Boveia, A., Brandt, A., Brandt, O., Brigliadori, L., Brochmann, M., Brock, R., Bromberg, C., Bross, A., Brown, D., Brucken, E., Bu, X.B., Budagov, J., Budd, H.S., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Burkett, K., Busetto, G., Bussey, P., Buszello, C.P., Butti, P., Buzatu, A., Calamba, A., Camacho-Pérez, E., Camarda, S., Campanelli, M., Canelli, F., Carls, B., Carlsmith, D., Carosi, R., Carrillo, S., Casal, B., Casarsa, M., Casey, B.C.K., Castilla-Valdez, H., Castro, A., Catastini, P., Caughron, S., Cauz, D., Cavaliere, V., Cerri, A., Cerrito, L., Chakrabarti, S., Chan, K.M., Chandra, A., Chapelain, A., Chapon, E., Chen, G., Chen, Y.C., Chertok, M., Chiarelli, G., Chlachidze, G., Cho, K., Cho, S.W., Choi, S., Chokheli, D., Choudhary, B., Cihangir, S., Claes, D., Clark, A., Clarke, C., Clutter, J., Convery, M.E., Conway, J., Cooke, M., Cooper, W.E., Corbo, M., Corcoran, M., Cordelli, M., Couderc, F., Cousinou, M.-C., Cox, C.A., Cox, D.J., Cremonesi, M., Cruz, D., Cuevas, J., Culbertson, R., Cuth, J., Cutts, D., Das, A., D'Ascenzo, N., Datta, M., Davies, G., De Barbaro, P., De Jong, S.J., De La Cruz-Burelo, E., Déliot, F., Demina, R., Demortier, L., Deninno, M., Denisov, D., Denisov, S.P., D'Errico, M., Desai, S., Deterre, C., Devaughan, K., Devoto, F., Di Canto, A., Di Ruzza, B., Diehl, H.T., Diesburg, M., Ding, P.F., Dittmann, J.R., Dominguez, A., Donati, S., D'Onofrio, M., Dorigo, M., Driutti, A., Drutskoy, A., Dubey, A., Dudko, L.V., Duperrin, A., Dutt, S., Eads, M., Ebina, K., Edgar, R., Edmunds, D., Elagin, A., Ellison, J., Elvira, V.D., Enari, Y., Erbacher, R., Errede, S., Esham, B., Evans, H., Evdokimov, A., Evdokimov, V.N., Farrington, S., Fauré, A., Feng, L., Ferbel, T., Fernández Ramos, J.P., Fiedler, F., Field, R., Filthaut, F., Fisher, W., Fisk, H.E., Flanagan, G., Forrest, R., Fortner, M., Fox, H., Franc, J., Franklin, M., Freeman, J.C., Frisch, H., Fuess, S., Funakoshi, Y., Galloni, C., Garbincius, P.H., Garcia-Bellido, A., García-González, J.A., Garfinkel, A.F., Garosi, P., Gavrilov, V., Geng, W., Gerber, C.E., Gerberich, H., Gerchtein, E., Gershtein, Y., Giagu, S., Giakoumopoulou, V., Gibson, K., Ginsburg, C.M., Ginther, G., Giokaris, N., Giromini, P., Glagolev, V., Glenzinski, D., Gogota, O., Gold, M., Goldin, D., Golossanov, A., Golovanov, G., Gomez, G., Gomez-Ceballos, G., Goncharov, M., González López, O., Gorelov, I., Goshaw, A.T., Goulianos, K., Gramellini, E., Grannis, P.D., Greder, S., Greenlee, H., Grenier, G., Gris, P., Grivaz, J.-F., Grohsjean, A., Grosso-Pilcher, C., Grünendahl, S., Grünewald, M.W., Guillemin, T., Guimaraes Da Costa, J., Gutierrez, G., Gutierrez, P., Hahn, S.R., Haley, J., Han, J.Y., Han, L., Happacher, F., Hara, K., Harder, K., Hare, M., Harel, A., Harr, R.F., Harrington-Taber, T., Hatakeyama, K., Hauptman, J.M., Hays, C., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinrich, J., Heinson, A.P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Herndon, M., Herner, K., Hesketh, G., Hildreth, M.D., Hirosky, R., Hoang, T., Hobbs, J.D., Hocker, A., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J.L., Hong, Z., Hopkins, W., Hou, S., Howley, I., Hubacek, Z., Hughes, R.E., Husemann, U., Hussein, M., Huston, J., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Introzzi, G., Iori, M., Ito, A.S., Ivanov, A., Jabeen, S., Jaffré, M., James, E., Jang, D., Jayasinghe, A., Jayatilaka, B., Jeon, E.J., Jeong, M.S., Jesik, R., Jiang, P., Jindariani, S., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jones, M., Jonsson, P., Joo, K.K., Joshi, J., Jun, S.Y., Jung, A.W., Junk, T.R., Juste, A., Kajfasz, E., Kambeitz, M., Kamon, T., Karchin, P.E., Karmanov, D., Kasmi, A., Kato, Y., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Ketchum, W., Keung, J., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y.N., Kilminster, B., Kim, D.H., Kim, H.S., Kim, J.E., Kim, M.J., Kim, S.H., Kim, S.B., Kim, Y.J., Kim, Y.K., Kimura, N., Kirby, M., Kiselevich, I., Kohli, J.M., Kondo, K., Kong, D.J., Konigsberg, J., Kotwal, A.V., Kozelov, A.V., Kraus, J., Kreps, M., Kroll, J., Kruse, M., Kuhr, T., Kumar, A., Kupco, A., Kurata, M., Kurča, T., Kuzmin, V.A., Laasanen, A.T., Lammel, S., Lammers, S., Lancaster, M., Lannon, K., Latino, G., Lebrun, P., Lee, H.S., Lee, H.S., Lee, J.S., Lee, S.W., Lee, W.M., Lei, X., Lellouch, J., Leo, S., Leone, S., Lewis, J.D., Li, D., Li, H., Li, L., Li, Q.Z., Lim, J.K., Limosani, A., Lincoln, D., Linnemann, J., Lipaev, V.V., Lipeles, E., Lipton, R., Lister, A., Liu, H., Liu, Q., Liu, T., Liu, Y., Lobodenko, A., Lockwitz, S., Loginov, A., Lokajicek, M., Lopes De Sa, R., Lucchesi, D., Lucà, A., Lueck, J., Lujan, P., Lukens, P., Luna-Garcia, R., Lungu, G., Lyon, A.L., Lys, J., Lysak, R., Maciel, A.K.A., Madar, R., Madrak, R., Maestro, P., Magaña-Villalba, R., Malik, S., Malik, S., Malyshev, V.L., Manca, G., Manousakis-Katsikakis, A., Mansour, J., Marchese, L., Margaroli, F., Marino, P., Martínez-Ortega, J., Matera, K., Mattson, M.E., Mazzacane, A., Mazzanti, P., McCarthy, R., McGivern, C.L., McNulty, R., Mehta, A., Mehtala, P., Meijer, M.M., Melnitchouk, A., Menezes, D., Mercadante, P.G., Merkin, M., Mesropian, C., Meyer, A., Meyer, J., Miao, T., Miconi, F., Mietlicki, D., Mitra, A., Miyake, H., Moed, S., Moggi, N., Mondal, N.K., Moon, C.S., Moore, R., Morello, M.J., Mukherjee, A., Mulhearn, M., Muller, T., Murat, P., Mussini, M., Nachtman, J., Nagai, Y., Naganoma, J., Nagy, E., Nakano, I., Napier, A., Narain, M., Nayyar, R., Neal, H.A., Negret, J.P., Nett, J., Neustroev, P., Nguyen, H.T., Nigmanov, T., Nodulman, L., Noh, S.Y., Norniella, O., Nunnemann, T., Oakes, L., Oh, S.H., Oh, Y.D., Okusawa, T., Orava, R., Orduna, J., Ortolan, L., Osman, N., Pagliarone, C., Pal, A., Palencia, E., Palni, P., Papadimitriou, V., Parashar, N., Parihar, V., Park, S.K., Parker, W., Partridge, R., Parua, N., Patwa, A., Pauletta, G., Paulini, M., Paus, C., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Pétroff, P., Phillips, T.J., Piacentino, G., Pianori, E., Pilot, J., Pitts, K., Plager, C., Pleier, M.-A., Podstavkov, V.M., Pondrom, L., Popov, A.V., Poprocki, S., Potamianos, K., Pranko, A., Prewitt, M., Price, D., Prokopenko, N., Prokoshin, F., Ptohos, F., Punzi, G., Qian, J., Quadt, A., Quinn, B., Ratoff, P.N., Razumov, I., Redondo Fernández, I., Renton, P., Rescigno, M., Rimondi, F., Ripp-Baudot, I., Ristori, L., Rizatdinova, F., Robson, A., Rodriguez, T., Rolli, S., Rominsky, M., Ronzani, M., Roser, R., Rosner, J.L., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Ruffini, F., Ruiz, A., Russ, J., Rusu, V., Sajot, G., Sakumoto, W.K., Sakurai, Y., Sánchez-Hernández, A., Sanders, M.P., Santi, L., Santos, A.S., Sato, K., Savage, G., Saveliev, V., Savitskyi, M., Savoy-Navarro, A., Sawyer, L., Scanlon, T., Schamberger, R.D., Scheglov, Y., Schellman, H., Schlabach, P., Schmidt, E.E., Schott, M., Schwanenberger, C., Schwarz, T., Schwienhorst, R., Scodellaro, L., Scuri, F., Seidel, S., Seiya, Y., Sekaric, J., Semenov, A., Severini, H., Sforza, F., Shabalina, E., Shalhout, S.Z., Shary, V., Shaw, S., Shchukin, A.A., Shears, T., Shepard, P.F., Shimojima, M., Shkola, O., Shochet, M., Shreyber-Tecker, I., Simak, V., Simonenko, A., Skubic, P., Slattery, P., Sliwa, K., Smith, J.R., Snider, F.D., Snow, G.R., Snow, J., Snyder, S., Söldner-Rembold, S., Song, H., Sonnenschein, L., Sorin, V., Soustruznik, K., St Denis, R., Stancari, M., Stark, J., Stefaniuk, N., Stentz, D., Stoyanova, D.A., Strauss, M., Strologas, J., Sudo, Y., Sukhanov, A., Suslov, I., Suter, L., Svoisky, P., Takemasa, K., Takeuchi, Y., Tang, J., Tecchio, M., Teng, P.K., Thom, J., Thomson, E., Thukral, V., Titov, M., Toback, D., Tokar, S., Tokmenin, V.V., Tollefson, K., Tomura, T., Tonelli, D., Torre, S., Torretta, D., Totaro, P., Trovato, M., Tsai, Y.-T., Tsybychev, D., Tuchming, B., Tully, C., Ukegawa, F., Uozumi, S., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., Van Leeuwen, W.M., Varelas, N., Varnes, E.W., Vasilyev, I.A., Vázquez, F., Velev, G., Vellidis, C., Verkheev, A.Y., Vernieri, C., Vertogradov, L.S., Verzocchi, M., Vesterinen, M., Vidal, M., Vilanova, D., Vilar, R., Vizán, J., Vogel, M., Vokac, P., Volpi, G., Wagner, P., Wahl, H.D., Wallny, R., Wang, M.H.L.S., Wang, S.M., Warchol, J., Waters, D., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Wester, W.C., III, Whiteson, D., Wicklund, A.B., Wilbur, S., Williams, H.H., Williams, M.R.J., Wilson, G.W., Wilson, J.S., Wilson, P., Winer, B.L., Wittich, P., Wobisch, M., Wolbers, S., Wolfmeister, H., Wood, D.R., Wright, T., Wu, X., Wu, Z., Wyatt, T.R., Xie, Y., Yamada, R., Yamamoto, K., Yamato, D., Yang, S., Yang, T., Yang, U.K., Yang, Y.C., Yao, W.-M., Yasuda, T., Yatsunenko, Y.A., Ye, W., Ye, Z., Yeh, G.P., Yi, K., Yin, H., Yip, K., Yoh, J., Yorita, K., Yoshida, T., Youn, S.W., Yu, G.B., Yu, I., Yu, J.M., Zanetti, A.M., Zeng, Y., Zennamo, J., Zhao, T.G., Zhou, B., Zhou, C., Zhu, J., Zielinski, M., Zieminska, D., Zivkovic, L., Zucchelli, S
Tevatron Run II combination of the effective leptonic electroweak mixing angle
No full textThe Ministry of Science and Innovation and the Consolider-Ingenio 2010 Program and the European Union community Marie Curie Fellowship Contract No. 302103.Aaltonen, T., Abazov, V.M., Abbott, B., Acharya, B.S., Adams, M., Adams, T., Agnew, J.P., Alexeev, G.D., Alkhazov, G., Alton, A., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Apollinari, G., Appel, J.A., Arisawa, T., Artikov, A., Asaadi, J., Ashmanskas, W., Askew, A., Atkins, S., Auerbach, B., Augsten, K., Aurisano, A., Aushev, V., Aushev, Y., Avila, C., Azfar, F., Badaud, F., Badgett, W., Bae, T., Bagby, L., Baldin, B., Bandurin, D.V., Banerjee, S., Barbaro-Galtieri, A., Barberis, E., Baringer, P., Barnes, V.E., Barnett, B.A., Barria, P., Bartlett, J.F., Bartos, P., Bassler, U., Bauce, M., Bazterra, V., Bean, A., Bedeschi, F., Begalli, M., Behari, S., Bellantoni, L., Bellettini, G., Bellinger, J., Benjamin, D., Beretvas, A., Beri, S.B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Beuselinck, R., Bhat, P.C., Bhatia, S., Bhatnagar, V., Bhatti, A., Bland, K.R., Blazey, G., Blessing, S., Bloom, K., Blumenfeld, B., Bocci, A., Bodek, A., Boehnlein, A., Boline, D., Boos, E.E., Borissov, G., Bortoletto, D., Borysova, M., Boudreau, J., Boveia, A., Brandt, A., Brandt, O., Brigliadori, L., Brochmann, M., Brock, R., Bromberg, C., Bross, A., Brown, D., Brucken, E., Bu, X.B., Budagov, J., Budd, H.S., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Burkett, K., Busetto, G., Bussey, P., Buszello, C.P., Butti, P., Buzatu, A., Calamba, A., Camacho-Pérez, E., Camarda, S., Campanelli, M., Canelli, F., Carls, B., Carlsmith, D., Carosi, R., Carrillo, S., Casal, B., Casarsa, M., Casey, B.C.K., Castilla-Valdez, H., Castro, A., Catastini, P., Caughron, S., Cauz, D., Cavaliere, V., Cerri, A., Cerrito, L., Chakrabarti, S., Chan, K.M., Chandra, A., Chapon, E., Chen, G., Chen, Y.C., Chertok, M., Chiarelli, G., Chlachidze, G., Cho, K., Cho, S.W., Choi, S., Chokheli, D., Choudhary, B., Cihangir, S., Claes, D., Clark, A., Clarke, C., Clutter, J., Convery, M.E., Conway, J., Cooke, M., Cooper, W.E., Corbo, M., Corcoran, M., Cordelli, M., Couderc, F., Cousinou, M.-C., Cox, C.A., Cox, D.J., Cremonesi, M., Cruz, D., Cuevas, J., Culbertson, R., Cuth, J., Cutts, D., Das, A., D'Ascenzo, N., Datta, M., Davies, G., De Barbaro, P., De Jong, S.J., De La Cruz-Burelo, E., Déliot, F., Demina, R., Demortier, L., Deninno, M., Denisov, D., Denisov, S.P., D'Errico, M., Desai, S., Deterre, C., Devaughan, K., Devoto, F., Di Canto, A., Di Ruzza, B., Diehl, H.T., Diesburg, M., Ding, P.F., Dittmann, J.R., Dominguez, A., Donati, S., D'Onofrio, M., Dorigo, M., Driutti, A., Drutskoy, A., Dubey, A., Dudko, L.V., Duperrin, A., Dutt, S., Eads, M., Ebina, K., Edgar, R., Edmunds, D., Elagin, A., Ellison, J., Elvira, V.D., Enari, Y., Erbacher, R., Errede, S., Esham, B., Evans, H., Evdokimov, A., Evdokimov, V.N., Farrington, S., Fauré, A., Feng, L., Ferbel, T., Fernández Ramos, J.P., Fiedler, F., Field, R., Filthaut, F., Fisher, W., Fisk, H.E., Flanagan, G., Forrest, R., Fortner, M., Fox, H., Franc, J., Franklin, M., Freeman, J.C., Frisch, H., Fuess, S., Funakoshi, Y., Galloni, C., Garbincius, P.H., Garcia-Bellido, A., García-González, J.A., Garfinkel, A.F., Garosi, P., Gavrilov, V., Geng, W., Gerber, C.E., Gerberich, H., Gerchtein, E., Gershtein, Y., Giagu, S., Giakoumopoulou, V., Gibson, K., Ginsburg, C.M., Ginther, G., Giokaris, N., Giromini, P., Glagolev, V., Glenzinski, D., Gogota, O., Gold, M., Goldin, D., Golossanov, A., Golovanov, G., Gomez, G., Gomez-Ceballos, G., Goncharov, M., González López, O., Gorelov, I., Goshaw, A.T., Goulianos, K., Gramellini, E., Grannis, P.D., Greder, S., Greenlee, H., Grenier, G., Gris, P., Grivaz, J.-F., Grohsjean, A., Grosso-Pilcher, C., Grünendahl, S., Grünewald, M.W., Guillemin, T., Guimaraes Da Costa, J., Gutierrez, G., Gutierrez, P., Hahn, S.R., Haley, J., Han, J.Y., Han, L., Happacher, F., Hara, K., Harder, K., Hare, M., Harel, A., Harr, R.F., Harrington-Taber, T., Hatakeyama, K., Hauptman, J.M., Hays, C., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinrich, J., Heinson, A.P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Herndon, M., Herner, K., Hesketh, G., Hildreth, M.D., Hirosky, R., Hoang, T., Hobbs, J.D., Hocker, A., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J.L., Hong, Z., Hopkins, W., Hou, S., Howley, I., Hubacek, Z., Hughes, R.E., Husemann, U., Hussein, M., Huston, J., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Introzzi, G., Iori, M., Ito, A.S., Ivanov, A., Jabeen, S., Jaffré, M., James, E., Jang, D., Jayasinghe, A., Jayatilaka, B., Jeon, E.J., Jeong, M.S., Jesik, R., Jiang, P., Jindariani, S., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jones, M., Jonsson, P., Joo, K.K., Joshi, J., Jun, S.Y., Jung, A.W., Junk, T.R., Juste, A., Kajfasz, E., Kambeitz, M., Kamon, T., Karchin, P.E., Karmanov, D., Kasmi, A., Kato, Y., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Ketchum, 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Search for rare and forbidden 3-body di-muon decays of the charmed mesons D+ and D-s(+)
No full textAbstractUsing a high statistics sample of photo-produced charm particles from the FOCUS experiment at Fermilab, we report results of a search for eight rare and Standard-Model-forbidden decays: D+, Ds+→h±μ∓μ+ (with h=π,K). Improvement over previous results by a factor of 1.7–14 is realized. Our branching ratio upper limit D+→π+μ−μ+ of 8.8×10−6 at the 90% C.L. is below the current MSSM R-parity violating constraint
Charm system tests of CPT and Lorentz invariance with FOCUS
No full textAbstractWe have performed a search for CPT violation in neutral charm meson oscillations. While flavor mixing in the charm sector is predicted to be small by the Standard Model, it is still possible to investigate CPT violation through a study of the proper time dependence of a CPT asymmetry in right-sign decay rates for D0→K−π+ and D0→K+π−. This asymmetry is related to the CPT violating complex parameter ξ and the mixing parameters x and y: ACPT∝(Reξ)y−(Imξ)x. Our 95% confidence level limit is −0.0068<(Reξ)y−(Imξ)x<0.0234. Within the framework of the Standard Model Extension incorporating general CPT violation, we also find 95% confidence level limits for the expressions involving coefficients of Lorentz violation of (−2.8<N(x,y,δ)(Δa0+0.6ΔaZ)<4.8)×10−16 GeV, (−7.0<N(x,y,δ)ΔaX<3.8)×10−16 GeV, and (−7.0<N(x,y,δ)ΔaY<3.8)×10−16 GeV, where N(x,y,δ) is the factor which incorporates mixing parameters x, y and the doubly Cabibbo-suppressed to Cabibbo-favored relative strong phase δ
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