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1,615 results on '"Buszello, Claus P."'

3. Odderon Exchange from Elastic Scattering Differences between pp and p(p)over-bar Data at 1.96 TeV and from pp Forward Scattering Measurements

Author

Abazov, V. M., Buszello, Claus P, and Zivkovic, L.

Subjects
Physical Sciences, Fysik
Abstract

We describe an analysis comparing the p (p) over bar elastic cross section as measured by the D0 Collaboration at a center-of-mass energy of 1.96 TeV to that in pp collisions as measured by the TOTEM Collaboration at 2.76, 7, 8, and 13 TeVusing a model-independent approach. The TOTEM cross sections, extrapolated to a center-of-mass energy of root s = 1.96 TeV, are compared with the D0 measurement in the region of the diffractive minimum and the second maximum of the pp cross section. The two data sets disagree at the 3.4s level and thus provide evidence for the t-channel exchange of a colorless, C-odd gluonic compound, also known as the odderon. We combine these results with a TOTEM analysis of the same C-odd exchange based on the total cross section and the ratio of the real to imaginary parts of the forward elastic strong interaction scattering amplitude in pp scattering for which the significance is between 3.4s and 4.6s. The combined significance is larger than 5 sigma and is interpreted as the first observation of the exchange of a colorless, C-odd gluonic compound. For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.127.062003

Published
2021

4. Study of the normalized transverse momentum distribution of W bosons produced in p(p)over-bar collisions at root s=1.96 TeV

Author

Abazov, V. M., Buszello, Claus P, and Zivkovic, L.

Subjects
Subatomär fysik, High Energy Physics::Phenomenology, Subatomic Physics, High Energy Physics::Experiment
Abstract

We present a study of the normalized transverse momentum distribution of W bosons produced in p (p) over bar collisions, using data corresponding to an integrated luminosity of 4.35 fb(-1) collected with the D0 detector at the Fermilab Tevatron collider at root s = 1.96 TeV. The measurement focuses on the transverse momentum region below 15 GeV, which is of special interest for electroweak precision measurements; it relies on the same detector calibration methods which were used for the precision measurement of the W boson mass. The measured distribution is compared to different QCD predictions and a procedure is given to allow the comparison of any further theoretical models to the D0 data. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.103.012003

Published
2021

6. Studies of X(3872) and psi(2S) production in p(p)over-bar collisions at 1.96 TeV

Author

Abazov, V. M., Buszello, Claus P, and Zivkovic, L.

Subjects
Subatomär fysik, Subatomic Physics, High Energy Physics::Experiment
Abstract

We present various properties of the production of the X(3872) and psi(2S) states based on 10.4 fb(-1) collected by the D0 experiment in Tevatron p (p) over bar collisions at root s = 1.96 TeV. For both states, we measure the nonprompt fraction f(NP) of the inclusive production rate due to decays of b-flavored hadrons. We find the f(NP) values systematically below those obtained at the LHC. The f(NP) fraction for psi(2S) increases with transverse momentum, whereas for the X(3872) it is constant within large uncertainties, in agreement with the LHC results. The ratio of prompt to nonprompt psi(2S) production, ( 1 - f(NP))/f(NP), decreases only slightly going from the Tevatron to the LHC, but for the X(3872), this ratio decreases by a factor of about 3. We test the soft-pion signature of the X(3872) modeled as a weakly bound charm-meson pair by studying the production of the X(3872) as a function of the kinetic energy of the X(3872) and the pion in the X(3872)pi center-of-mass frame. For a subsample consistent with prompt production, the results are incompatible with a strong enhancement in the production of the X(3872) at the small kinetic energy of the X(3872) and the pi in the X(3872)pi center-of-mass frame expected for the X + soft-pion production mechanism. For events consistent with being due to decays of b hadrons, there is no significant evidence for the soft-pion effect, but its presence at the level expected for the binding energy of 0.17 MeV and the momentum scale Lambda = M(pi) is not ruled out. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.102.072005

Published
2020

7. Properties of Z(c)(+/-)(3900) produced in p(p)over-bar collisions

Author

Abazov, V. M., Buszello, Claus P, and Zivkovic, L.

Subjects
Subatomär fysik, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We study the production of the exotic charged charmoniumlike state Z(c)(+/-)(3900) in p (p) over bar collisions through the sequential process psi(4260) -> Z(c)(+/-)(3900)(pi)(-/+), Z(c)(+/-)(3900) -> J/psi pi(+/-). Using the subsample of candidates originating from semi-inclusive weak decays of b-flavored hadrons, we measure the invariant mass and natural width to be M = 3902.6(-5.0)(+5.2)(stat)(-1.4)(+3.3)(syst) MeV and Gamma = 32(-21)(+28)(stat)(-7)(+26)(syst) MeV, respectively. We search for prompt production of the Z(c)(+/-)(3900) through the same sequential process. No significant signal is observed, and we set an upper limit of 0.70 at the 95% credibility level on the ratio of prompt production to the production via b-hadron decays. The study is based on 10.4 fb(-1) of p (p) over bar collision data collected by the D0 experiment at the Fermilab Tevatron collider. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.012005

Published
2019

8. Study of the X-+/-(5568) state with semileptonic decays of the B-s(0) meson

Author

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V, Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. , V, Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V, Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I, Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V, Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V, Bunichev, V, Burdin, S., Buszello, Claus P, Camacho-Perez, E., Casey, B. C. K., Castilla-Vaidez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M-C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Drutskoy, A., Dubey, A., Dudko, L. , V, Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbe, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortne, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V, Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph, Grivaz, J-F, Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I, Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I, Hubacek, Z., Hynek, V, Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I, Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I, Kohli, J. M., Kozelov, A. , V, Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Macie, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Pal, A., Parashar, N., Parihar, V, Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M-A, Podstavkov, V. M., Popov, A. , V, Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I, Ripp-Baudot, I, Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V, Shaw, S., Shchukin, A. A., Shkola, O., Simak, V, Skubic, P., Slattery, P., Snow, G. R., Snow, J., Snyder, S., Soldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stefaniuk, N., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokemenin, V. V., Tsai, Y-T, Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Subjects
Subatomär fysik, COLLISIONS, Science & Technology, ROOT-S=1.96 TEV, Physics, Subatomic Physics, Physical Sciences, High Energy Physics::Experiment, Astronomy & Astrophysics, Nuclear Experiment, DETECTOR, Physics, Particles & Fields
Abstract

We present a study of the X-+/-(5568) using semileptonic decays of the B-s(0) meson using the full run II integrated luminosity of 10.4 fb(-1) in proton-antiproton collisions at a center of mass energy of 1.96 TeV collected with the DO detector at the Fermilab Tevatron Collider. We report evidence for a narrow structure, X-+/-(5568), in the decay sequence X-+/-(5568) -> B-s(0) pi(+/-) where B-s(0)-> mu(-/+) (DsX)-X-+/-, D-s(+/-)-> phi pi(+/-)which is consistent with the previous measurement by the DO Collaboration in the hadronic decay mode, X-+/-(5568) -> B-s(0)pi(+/-) where B-s(0 )-> J/psi phi. The mass and width of this state are measured using a combined fit of the hadronic and semileptonic data, yielding m = 5566.9(-3.1)(+3.2)(stat)(-1.2)(+0.6)(syst) MeV/c(2), Gamma = 18.6(-6.1)(+7.9)(stat)(-3.8)(+3.5) (syst) McV/c(2) with a significance of 6.7 sigma.

Published
2018

9. Evidence for Z(c)(+/-)(3900) in semi-inclusive decays of b-flavored hadrons

Author

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V, Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. , V, Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V, Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I, Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V, Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V, Bunichev, V, Burdin, S., Buszello, Claus P, Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M-C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Drutskoy, A., Dubey, A., Dudko, L. , V, Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V, Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph, Grivaz, J-F, Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I, Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I, Hubacek, Z., Hynek, V, Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I, Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I, Kohli, J. M., Kozelov, A. , V, Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Pal, A., Parashar, N., Parihar, V, Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M-A, Podstavkov, V. M., Popov, A. , V, Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I, Ripp-Baudot, I, Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V, Shaw, S., Shchukin, A. A., Shkola, O., Simak, V, Skubic, P., Slattery, P., Snow, G. R., Snow, J., Snyder, S., Soldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stefaniuk, N., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokmenin, V. V., Tsai, Y-T, Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., Zivkovic, L., Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V, Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. , V, Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V, Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I, Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V, Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V, Bunichev, V, Burdin, S., Buszello, Claus P, Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M-C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Drutskoy, A., Dubey, A., Dudko, L. , V, Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V, Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph, Grivaz, J-F, Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I, Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I, Hubacek, Z., Hynek, V, Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I, Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I, Kohli, J. M., Kozelov, A. , V, Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Pal, A., Parashar, N., Parihar, V, Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M-A, Podstavkov, V. M., Popov, A. , V, Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. 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Abstract

We present evidence for the exotic charged charmoniumlike state Z(c)(+/-)(3900) decaying to J/psi pi(+/-) in semi-inclusive weak decays of b-flavored hadrons. The signal is correlated with a parent J/psi pi(+)pi(-) system in the invariant-mass range 4.2-4.7 GeV that would include the exotic structure Y(4260). The study is based on 10.4 fb(-1) of p (p) over bar collision data collected by the D0 experiment at the Fermilab Tevatron collider.

Published
2018
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10. Tevatron Run II combination of the effective leptonic electroweak mixing angle

Author

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. 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., Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Bhatti, A., Bland, K. 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Abstract

Drell-Yan lepton pairs produced in the process p (p) over bar -> l(+)l(-) + X through an intermediate gamma*/Z boson have an asymmetry in their angular distribution related to the spontaneous symmetry breaking of the electroweak force and the associated mixing of its neutral gauge bosons. The CDF and D0 experiments have measured the effective-leptonic electroweak mixing parameter sin(2) theta(lept)(eff) using electron and muon pairs selected from the full Tevatron proton-antiproton data sets collected in 2001-2011, corresponding to 9-10 fb(-1) of integrated luminosity. The combination of these measurements yields the most precise result from hadron colliders, sin(2)theta(lept)(eff) = 0.23148 +/- 0.00033. This result is consistent with, and approaches in precision, the best measurements from electron-positron colliders. The standard model inference of the on-shell electroweak mixing parameter sin(2) theta(W), or equivalently the W-boson mass M-W, using the ZFITTER software package yields sin(2) theta(W) = 0.22324 +/- 0.00033 or equivalently, M-W = 80.367 +/- 0.017 GeV/c(2).

Published
2018
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11. Measurement of the Effective Weak Mixing Angle in p¯p→Z/γ∗→ℓ+ℓ− Events

Author

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, Claus P, Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Drutskoy, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph., Grivaz, J. -F, Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. 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Abstract

We present a measurement of the effective weak mixing angle parameter sin(2)theta(l)(eff) in p (p) over bar -> Z/gamma* -> mu(+)mu(-) events at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider and corresponding to 8.6 fb(-1) of integrated luminosity. The measured value of sin(2)theta(l)(eff)[mu mu] = 0.23016 +/- 0.00064 is further combined with the result from the D0 measurement in p (p) over bar -> Z/gamma* -> e(+)e(-) events, resulting in sin(2)theta(l)(eff)[comb] = 0.23095 +/- 0.00040. This combined result is the most precise measurement from a single experiment at a hadron collider and is the most precise determination using the coupling of the Z/gamma* to light quarks., Title in WoS: Measurement of the Effective Weak Mixing Angle in p(p)over-bar -> Z/gamma* -> l(+) l(-) Events

Published
2018
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12. Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron

Author

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., Besancon, 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, Claus P., Butti, P., Buzatu, A., Calamba, A., Camacho-Perez, 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. 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Abstract

The CDF and D0 experiments at the Fermilab Tevatron have measured the asymmetry between yields of forward- and backward-produced top and antitop quarks based on their rapidity difference and the asymmetry between their decay leptons. These measurements use the full data sets collected in proton-antiproton collisions at a center-of-mass energy of root s = 1.96 TeV. We report the results of combinations of the inclusive asymmetries and their differential dependencies on relevant kinematic quantities. The combined inclusive asymmetry is A(FB)(t (t) over bar) = 0.128 +/- 0.025. The combined inclusive and differential asymmetries are consistent with recent standard model predictions.

Published
2018
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13. Measurement of top quark polarization in t(t)over-bar lepton+jets final states

Author

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, Claus P., Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph., Grivaz, J. -F, Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I., Hubacek, Z., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M. -A, Podstavkov, V. M., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Santos, A. 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A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., Zivkovic, L., Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, Claus P., Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. 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A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M. -A, Podstavkov, V. M., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shaw, S., Shchukin, A. A., Shkola, O., Simak, V., Skubic, P., Slattery, P., Snow, G. R., Snow, J., Snyder, S., Soldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stefaniuk, N., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokmenin, V. V., Tsai, Y. -T, Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Abstract

We present a measurement of top quark polarization in t (t) over bar pair production in p (p) over bar collisions at root s = 1.96 TeV using data corresponding to 9.7 fb(-1) of integrated luminosity recorded with the D0 detector at the Fermilab Tevatron Collider. We consider final states containing a lepton and at least three jets. The polarization is measured through the distribution of lepton angles along three axes: the beam axis, the helicity axis, and the transverse axis normal to the t (t) over bar production plane. This is the first measurement of top quark polarization at the Tevatron using lepton + jet final states and the first measurement of the transverse polarization in t (t) over bar production. The observed distributions are consistent with standard model predictions of nearly no polarization.

Published
2017
Full Text
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14. Measurement of the direct CP violating charge asymmetry in B-+/- -> mu(+/-)nu D-mu(0) decays

Author

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, Claus P., Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph., Grivaz, J. -F, Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I., Hubacek, Z., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M. -A, Podstavkov, V. M., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shaw, S., Shchukin, A. A., Shkola, O., Simak, V., Skubic, P., Slattery, P., Snow, G. R., Snow, J., Snyder, S., Soldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stefaniuk, N., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokmenin, V. V., Tsai, Y. -T, Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., Zivkovic, L., Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, Claus P., Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph., Grivaz, J. -F, Grohsjean, A., Grunendahl, S., Grunewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I., Hubacek, Z., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M. -A, Podstavkov, V. M., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shaw, S., Shchukin, A. A., Shkola, O., Simak, V., Skubic, P., Slattery, P., Snow, G. R., Snow, J., Snyder, S., Soldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stefaniuk, N., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokmenin, V. V., Tsai, Y. -T, Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Abstract

We present the first measurement of the CP violating charge asymmetry in B-+/- -> mu(+/-)nu D-mu(0) decays using the full Run II integrated luminosity of 10.4 fb(-1) in proton-antiproton collisions collected with the D0 detector at the Fermilab Tevatron Collider. We measure a difference in the yield of B- and B+ mesons in these decays by fitting the reconstructed invariant mass distributions. This results in an asymmetry of A(mu D0) = [-0.14 +/- 0.20] %, which is consistent with standard model predictions.

Published
2017
Full Text
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15. Centrality, rapidity, and transverse momentum dependence of isolated prompt photon production in lead-lead collisions at root S-NN=2.76 TeV measured with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Subatomär fysik, Subatomic Physics
Abstract

Prompt photon production in root S-NN = 2.76-TeV Pb + Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb(-1). Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals, vertical bar eta vertical bar < 1.37 and 1.52 ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevC.93.034914Funding: We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST, and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR, and VSC CR, Czech Republic; DNRF, DNSRC, and Lundbeck Foundation, Denmark; IN2P3-CNRS and CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF, I-CORE, and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF, Cantons of Bern, and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, the Canada Council, CANARIE, CRC, Compute Canada, FQRNT, and the Ontario Innovation Trust, Canada; EPLANET, ERC, FP7, Horizon 2020, and Marie Skodowska-Curie Actions, European Union; Investissements d'Avenir Labex and Idex, ANR, Region Auvergne and Fondation Partager le Savoir, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; BSF, GIF, and Minerva, Israel; BRF, Norway; the Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (U.K.), and BNL (USA) and in the Tier-2 facilities worldwide.

Published
2016

16. Measurement of spin correlation between top and antitop quarks produced in p(p)over-bar collisions at root s=1.96 TeV

Author

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, Claus P., Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph., Grivaz, J. -F, Grohsjean, A., Gruenendahl, S., Gruenewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauerbg, J. L., Howley, I., Hubacek, Z., Hynek, V., Iashvili, I., Ilchenko, Y., Illingvvorth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karacheban, O., Karmanov, D., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyers, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Osta, J., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M. -A, Podstavkov, V. M., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A. T., Quinn, B., Ratoff, P. N., Razumov, I., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shaw, S., Shchukin, A. A., Simak, V., Skubic, P., Slattery, P., Smirnov, D., Snow, G. R., Snow, Tt, Snyder, S., Soeldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stefaniuk, N., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokmenin, V. V., Tsai, Y. -T, Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, T., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., Zivkovic, L., Ctr Brasileiro Pesquisas Fis, Universidade do Estado do Rio de Janeiro (UERJ), Universidade Federal do ABC (UFABC), Univ Sci & Technol China, Univ Los Andes, Charles Univ Prague, Czech Tech Univ, Acad Sci Czech Republic, Univ San Francisco Quito, Univ Clermont Ferrand, Univ Grenoble 1, Aix Marseille Univ, Univ Paris Saclay, Univ Paris 06, Universidade de São Paulo (USP), CEA, Univ Strasbourg, Univ Lyon 1, Univ Lyon, Rhein Westfal TH Aachen, Univ Freiburg, Univ Gottingen, Johannes Gutenberg Univ Mainz, Univ Munich, Panjab Univ, Univ Delhi, Tata Inst Fundamental Res, Univ Coll Dublin, Korea Univ, CINVESTAV, Nikhef, Radboud Univ Nijmegen, Joint Inst Nucl Res, Inst Theoret & Expt Phys, Moscow MV Lomonosov State Univ, Inst High Energy Phys, Petersburg Nucl Phys Inst, ICREA, IFAE, Uppsala Univ, Taras Shevchenko Natl Univ Kyiv, Univ Lancaster, Univ London Imperial Coll Sci Technol & Med, Univ Manchester, Univ Arizona, Univ Calif Riverside, Florida State Univ, Fermilab Natl Accelerator Lab, Univ Illinois, Northwestern Univ, Indiana Univ, Purdue Univ Calumet, Univ Notre Dame, Iowa State Univ, Univ Kansas, Louisiana Tech Univ, Northeastern Univ, Univ Michigan, Michigan State Univ, Univ Mississippi, Univ Nebraska, Rutgers State Univ, Princeton Univ, SUNY Buffalo, Univ Rochester, SUNY Stony Brook, Brookhaven Natl Lab, Langston Univ, Univ Oklahoma, Oklahoma State Univ, Oregon State Univ, Brown Univ, Univ Texas Arlington, So Methodist Univ, Rice Univ, Univ Virginia, Univ Washington, Augustana Coll, Univ Liverpool, DESY, CONACyT, SLAC, UCL, IPN, Universidade Estadual Paulista (Unesp), KIT, US DOE, Amer Assoc Advancement Sci, Kiev Inst Nucl Res, Univ Maryland, European Org Nucl Res CERN, and Purdue Univ

Subjects
Science & Technology, IDENTIFICATION, PAIR PRODUCTION, Physics, SEMILEPTONIC DECAYS, High Energy Physics::Phenomenology, Astronomy & Astrophysics, Nuclear & Particles Physics, Physics, Particles & Fields, Subatomär fysik, Physics, Nuclear, 0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics, Physical Sciences, Subatomic Physics, HADRON COLLIDERS, High Energy Physics::Experiment, HEAVY QUARKS, LHC, TEVATRON, Nuclear Experiment, RUN-II, DETECTOR
Abstract

Made available in DSpace on 2018-11-26T15:29:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-06-10 Department of Energy (United States of America) National Science Foundation (United States of America) Alternative Energies and Atomic Energy Commission (France) National Center for Scientific Research/ National Institute of Nuclear and Particle Physics (France) Ministry of Education and Science of the Russian Federation (Russia) National Research Center Kurchatov Institute of the Russian Federation (Russia) Russian Foundation for Basic Research (Russia) National Council for the Development of Science and Technology (Brazil) Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Department of Atomic Energy (India) Department of Science and Technology (India) Administrative Department of Science, Technology and Innovation(Colombia) National Council of Science and Technology (Mexico) National Research Foundation of Korea (Korea) Foundation for Fundamental Research on Matter (The Netherlands) Science and Technology Facilities Council (United Kingdom) The Royal Society (United Kingdom) Ministry of Education, Youth and Sports (Czech Republic) Bundesministerium fur Bildung and Forschung (Federal Ministry of Education and Research) (Germany) Deutsche Forschungsgemeinschaft (German Research Foundation) (Germany) Science Foundation Ireland (Ireland) Swedish Research Council (Sweden) China Academy of Sciences (China) National Natural Science Foundation of China (China) Ministry of Education and Science of Ukraine (Ukraine) ICREA Science and Technology Facilities Council We present a measurement of the correlation between the spins of t and (t) over bar 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 DO detector that correspond to an integrated luminosity of 9.7 fb(-1). The measured value of the correlation coefficient in the off-diagonal basis, O-off = 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. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3). Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil Univ Fed ABC, Santo Andre, Brazil Univ Sci & Technol China, Hefei 230026, Peoples R China Univ Los Andes, Bogota, Colombia Charles Univ Prague, Fac Math & Phys, Ctr Particle Phys, Prague, Czech Republic Czech Tech Univ, CR-16635 Prague, Czech Republic Acad Sci Czech Republic, Inst Phys, Prague, Czech Republic Univ San Francisco Quito, Quito, Ecuador Univ Clermont Ferrand, CNRS IN2P3, LPC, Clermont, France Univ Grenoble 1, Inst Natl Polytech Grenoble, CNRS IN2P3, LPSC, Grenoble, France Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France Univ Paris Saclay, CNRS IN2P3, Univ Paris Sud, LAL, Orsay, France Univ Paris 06, LPNHE, Paris, France Univ Paris 07, CNRS IN2P3, Paris, France CEA, Irfu, Saclay, France Univ Strasbourg, IPHC, CNRS IN2P3, Strasbourg, France Univ Lyon 1, IPNL, CNRS IN2P3, Villeurbanne, France Univ Lyon, Lyon, France Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany Univ Freiburg, Inst Phys, Hugstetter Str 55, D-79106 Freiburg, Germany Univ Gottingen, Inst Phys 2, Gottingen, Germany Johannes Gutenberg Univ Mainz, Inst Phys, Mainz, Germany Univ Munich, Munich, Germany Panjab Univ, Chandigarh 160014, India Univ Delhi, Delhi 110007, India Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India Univ Coll Dublin, Dublin 2, Ireland Korea Univ, Korea Detector Lab, Seoul, South Korea CINVESTAV, Mexico City 14000, DF, Mexico Nikhef, Sci Pk, Amsterdam, Netherlands Radboud Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands Joint Inst Nucl Res, Dubna, Russia Inst Theoret & Expt Phys, Moscow 117259, Russia Moscow MV Lomonosov State Univ, Moscow, Russia Inst High Energy Phys, Protvino, Russia Petersburg Nucl Phys Inst, St Petersburg, Russia ICREA, Barcelona, Spain IFAE, Barcelona, Spain Uppsala Univ, Uppsala, Sweden Taras Shevchenko Natl Univ Kyiv, Kiev, Ukraine Univ Lancaster, Lancaster LA1 4YB, England Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England Univ Manchester, Manchester M13 9PL, Lancs, England Univ Arizona, Tucson, AZ 85721 USA Univ Calif Riverside, Riverside, CA 92521 USA Florida State Univ, Tallahassee, FL 32306 USA Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA Univ Illinois, Chicago, IL 60607 USA Univ Illinois, De Kalb, IL 60115 USA Northwestern Univ, Evanston, IL 60208 USA Indiana Univ, Bloomington, IN 47405 USA Purdue Univ Calumet, Hammond, IN 46323 USA Univ Notre Dame, Notre Dame, IN 46556 USA Iowa State Univ, Ames, IA 50011 USA Univ Kansas, Lawrence, KS 66045 USA Louisiana Tech Univ, Ruston, LA 71272 USA Northeastern Univ, Boston, MA 02115 USA Univ Michigan, Ann Arbor, MI 48109 USA Michigan State Univ, E Lansing, MI 48824 USA Univ Mississippi, University, MS 38677 USA Univ Nebraska, Lincoln, NE 68588 USA Rutgers State Univ, Piscataway, NJ 08855 USA Princeton Univ, Princeton, NJ 08544 USA SUNY Buffalo, Buffalo, NY 14260 USA Univ Rochester, Rochester, NY 14627 USA SUNY Stony Brook, Stony Brook, NY 11794 USA Brookhaven Natl Lab, Upton, NY 11973 USA Langston Univ, Langston, OK 73050 USA Univ Oklahoma, Norman, OK 73019 USA Oklahoma State Univ, Stillwater, OK 74078 USA Oregon State Univ, Corvallis, OR 97331 USA Brown Univ, Providence, RI 02912 USA Univ Texas Arlington, Arlington, TX 76019 USA So Methodist Univ, Dallas, TX 75275 USA Rice Univ, Houston, TX 77005 USA Univ Virginia, Charlottesville, VA 22904 USA Univ Washington, Seattle, WA 98195 USA Augustana Coll, Sioux Falls, SD USA Univ Liverpool, Liverpool L69 3BX, Merseyside, England DESY, Notkestr 85, Hamburg, Germany CONACyT, Mexico City, DF, Mexico SLAC, Menlo Pk, CA USA UCL, London, England IPN, Ctr Invest Computac, Mexico City 07738, DF, Mexico Univ Estadual Paulista, Sao Paulo, Brazil KIT, SCC, D-76128 Karlsruhe, Germany US DOE, Off Sci, Washington, DC 20585 USA Amer Assoc Advancement Sci, Washington, DC 20005 USA Kiev Inst Nucl Res, Kiev, Ukraine Univ Maryland, College Pk, MD 20742 USA European Org Nucl Res CERN, Geneva, Switzerland Purdue Univ, W Lafayette, IN 47907 USA Univ Estadual Paulista, Sao Paulo, Brazil Science and Technology Facilities Council: PP/D004284/1

Published
2016

17. Measurement of the t(t)over-bar production cross-section using e mu events with b-tagged jets in pp collisions at root s=7 and 8 TeV with the ATLAS detector

Author

Aad, G., Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel Smith, Camila, and Zwalinski, L.

Subjects
Subatomär fysik, High Energy Physics::Phenomenology, Physical Sciences, Subatomic Physics, Fysik, High Energy Physics::Experiment
Abstract

The inclusive top quark pair (t (t) over tilde) production cross-section sigma(t (t) over bar) has been measured in proton-proton collisions at root s = 7 TeV and root s = 8 TeV with the ATLAS experiment at the LHC, using t (t) over bar events with an opposite-charge e mu pair in the final state. The measurement was performed with the 2011 7 TeV dataset corresponding to an integrated luminosity of 4.6 fb(-1) and the 2012 8 TeV dataset of 20.3 fb(-1). The numbers of events with exactly one and exactly two b-tagged jets were counted and used to simultaneously determine sigma(t (t) over bar) and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section was measured to be: sigma(t (t) over bar) = 182.9 +/- 3.1 +/- 4.2 +/- 3.6 +/- 3.3 pb (root s = 7 TeV) and sigma(t (t) over bar) = 242.4 +/- 1.7 +/- 5.5 +/- 7.5 +/- 4.2 pb (root s = 8 TeV), where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, knowledge of the integrated luminosity and of the LHC beam energy. The results are consistent with recent theoretical QCD calculations at next-to-next-to-leading order. Fiducial measurements corresponding to the experimental acceptance of the leptons are also reported, together with the ratio of cross-sections measured at the two centre-of-mass energies. The inclusive cross-section results were used to determine the top quark pole mass via the dependence of the theoretically predicted cross-section on m(t)(pole) giving a result of m(t)(pole) = 172.9(-2.6)(+2.5) GeV. By looking for an excess of t (t) over bar production with respect to the QCD prediction, the results were also used to place limits on the pair-production of supersymmetric top squarks (t) over tilde (1) with masses close to the top quarkmass, decaying via (t) over tilde (1) -> t (chi) over tilde (0)(1) 1 to predominantly right-handed top quarks and a light neutralino (chi) over tilde (0)(1) 1, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 177 GeV are excluded at the 95% confidence level. ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1140/epjc/s10052-014-3109-7Se även addendum publicerat i: European Phyiical Journal C, Vol 76 (2016): 642

Published
2016

18. Evidence for Simultaneous Production of J/psi and Upsilon Mesons

Author

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besancon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, Claus P., Camacho-Perez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. -C, Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Deliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Faure, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., Garcia-Gonzalez, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph., Grivaz, J. -F, Grohsjean, A., Gruenendahl, S., Gruenewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I., Hubacek, Z., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffre, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurca, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., de Sa, R. Lopes, Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magana-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martinez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Osta, J., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Petroff, P., Pleier, M. -A, Podstavkov, V. M., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sanchez-Hernandez, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shaw, S., Shchukin, A. A., Simak, V., Skubic, P., Slattery, P., Smirnov, D., Snow, G. R., Snow, J., Snyder, S., Soeldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokmenin, V. V., Tsai, Y. -T, Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., and Zivkovic, L.

Subjects
HADRONIC COLLISIONS, General Physics, Science & Technology, PP COLLISIONS, 02 Physical Sciences, ROOT-S=7 TEV, PAIR PRODUCTION, Physics, Physics, Multidisciplinary, High Energy Physics::Phenomenology, PROMPT J/PSI, QUARKONIUM PRODUCTION, Physical Sciences, Fysik, High Energy Physics::Experiment, HADROPRODUCTION, Nuclear Experiment, RUN-II, DETECTOR, DOUBLE PARTON SCATTERING, D0 Collaboration
Abstract

We report evidence for the simultaneous production of J/psi and Upsilon mesons in 8.1 fb(-1) of data collected at root s = 1.96 TeV by the D0 experiment at the Fermilab p (p) over bar Tevatron Collider. Events with these characteristics are expected to be produced predominantly by gluon-gluon interactions. In this analysis, we extract the effective cross section characterizing the initial parton spatial distribution, sigma(eff) = 2.2 +/- 0.7(stat) +/- 0.9(syst) mb.

Published
2016

19. Search for high-mass diphoton resonances in pp collisions at pffisffi root s=8 TeV with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik
Abstract

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevD.92.032004

Published
2015

20. Search for long-lived, weakly interacting particles that decay to displaced hadronic jets in proton-proton collisions at root s=8 TeV with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik
Abstract

A search for the decay of neutral, weakly interacting, long-lived particles using data collected by the ATLAS detector at the LHC is presented. This analysis uses the full data set recorded in 2012: 20.3 fb(-1) of proton-proton collision data at root s = 8 TeV. The search employs techniques for reconstructing decay vertices of long-lived particles decaying to jets in the inner tracking detector and muon spectrometer. Signal events require at least two reconstructed vertices. No significant excess of events over the expected background is found, and limits as a function of proper lifetime are reported for the decay of the Higgs boson and other scalar bosons to long-lived particles and for Hidden Valley Z' and Stealth SUSY benchmark models. The first search results for displaced decays in Z' and Stealth SUSY models are presented. The upper bounds of the excluded proper lifetimes are the most stringent to date. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevD.92.012010Funding: ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; RGC, Hong Kong SAR, China; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.

Published
2015

21. Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at root s=8 TeV Using the ATLAS Detector

Author

Aad, G., Kuutmann, Elin Bergeås, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrando, J, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camila, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A measurement of spin correlation in t (t) over bar production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb(-1). The correlation between the top and antitop quark spins is extracted from dilepton t (t) over bar events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to A(helicity) = 0.38 +/- 0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.114.142001

Published
2015

22. Observation of top-quark pair production in association with a photon and measurement of the t(t)over-bar gamma production cross section in pp collisions at root s=7 TeV using the ATLAS detector

Author

Aad, G., Bergeås Kuutmaan, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel Smith, Camila, and Zwalinski, L.

Subjects
Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A search is performed for top-quark pairs (tt¯) produced together with a photon (γ) with transverse energy greater than 20 GeV using a sample of tt¯ candidate events in final states with jets, missing transverse momentum, and one isolated electron or muon. The data set used corresponds to an integrated luminosity of 4.59 fb−1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. In total, 140 and 222 tt¯γ candidate events are observed in the electron and muon channels, to be compared to the expectation of 79±26 and 120±39 non-tt¯γ background events, respectively. The production of tt¯γ events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The tt¯γ production cross section times the branching ratio (BR) of the single-lepton decay channel is measured in a fiducial kinematic region within the ATLAS acceptance. The measured value is σfidtt¯γ×BR=63±8(stat)+17−13(syst)±1(lumi) fb per lepton flavor, in good agreement with the leading-order theoretical calculation normalized to the next-to-leading-order theoretical prediction of 48±10 fb. ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1103/PhysRevD.91.072007

Published
2015

23. Simultaneous measurements of the t(t)over-bar, W+W-, and Z/gamma* -> tau tau production cross-sections in pp collisions at root s=7 TeV with the ATLAS detecto

Author

Aad, G., Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

Simultaneous measurements of the t (t) over bar, W+W-, and Z/gamma* -> tau tau production cross-sections using an integrated luminosity of 4.6 fb(-1) of pp collisions at root s = 7 TeV collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse momentum leptons consisting of an oppositely charged electron and muon pair. The three processes are separated using the distributions of the missing transverse momentum of events with zero and greater than zero jet multiplicities. Measurements of the fiducial cross-section are presented along with results that quantify for the first time the underlying correlations in the predicted and measured cross-sections due to proton parton distribution functions. These results indicate that the correlated next-to-leading-order predictions for t (t) over bar and Z/gamma* -> tau tau underestimate the data, while those at next-to-next-to-leading-order generally describe the data well. The full cross-sections are measured to be sigma(t (t) over bar) = 181.2 +/- 2.8(-9.5)(+9.7) +/- 3.3 +/- 3.3 pb, sigma(W+W-) = 53.3 +/- 2.7(-8.0)(+7.3) +/- 1.0 +/- 0.5 pb, and sigma(Z/gamma* -> tau tau) = 1174 +/- 24(-87)(+72) +/- 21 +/- 9 pb, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively. The W+W- measurement includes the small contribution from Higgs boson decays, H -> W+W-. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevD.91.052005

Published
2015

24. Search for a new resonance decaying to a W or Z boson and a Higgs boson in the ll/lv/vv plus b(b)over-bar final states with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A search for a new resonance decaying to a W or Z boson and a Higgs boson in the ll/lv/vv + b (b) over bar final states is performed using 20.3 fb(-1) of pp collision data recorded at root s = 8 TeV with the ATLAS detector at the Large Hadron Collider. The search is conducted by examining the WH/ZH invariant mass distribution for a localized excess. No significant deviation from the Standard Model background prediction is observed. The results are interpreted in terms of constraints on the Minimal Walking Technicolor model and on a simplified approach based on a phenomenological Lagrangian of Heavy Vector Triplets. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3474-x

Published
2015

25. Measurements of Higgs boson production and couplings in the four-lepton channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector

Author

Aad, G., Bergeås Kuutmann, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camila, and Zwalinski, L.

Subjects
Physical Sciences, Fysik
Abstract

The final ATLAS Run 1 measurements of Higgs boson production and couplings in the decay channel H -> ZZ* -> l(+)l(-)l(+)l'(-), where l, l' = e or mu, are presented. These measurements were performed using pp collision data corresponding to integrated luminosities of 4.5 and 20.3 fb(-1) at center-of-mass energies of 7 and 8 TeV, respectively, recorded with the ATLAS detector at the LHC. The H -> ZZ* -> 4l signal is observed with a significance of 8.1 standard deviations, with an expectation of 6.2 standard deviations, at m(H) = 125.36 GeV, the combined ATLAS measurement of the Higgs boson mass from the H -> gamma gamma and H -> ZZ* -> 4l channels. The production rate relative to the Standard Model expectation, the signal strength, is measured in four different production categories in the H -> ZZ* -> 4l channel. The measured signal strength, at this mass, and with all categories combined, is 1.44(-0.33)(+0.40). The signal strength for Higgs boson production in gluon fusion or in association with (tt) over bar or (bb) over bar pairs is found to be 1.7(-0.4)(+0.5), while the signal strength for vector-boson fusion combined with WH/ZH associated production is found to be 0.3(-0.9)(+1.6). ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1103/PhysRevD.91.012006

Published
2015

26. Search for Scalar Charm Quark Pair Production in pp Collisions at root s=8 TeV with the ATLAS Detector

Author

Aad, G., Aloisio, A., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The results of a dedicated search for pair production of scalar partners of charm quarks are reported. The search is based on an integrated luminosity of 20.3 fb(-1) of pp collisions at root s = 8 TeV recorded with the ATLAS detector at the LHC. The search is performed using events with large missing transverse momentum and at least two jets, where the two leading jets are each tagged as originating from c quarks. Events containing isolated electrons or muons are vetoed. In an R-parity-conserving minimal super-symmetric scenario in which a single scalar-charm state is kinematically accessible, and where it decays exclusively into a charm quark and a neutralino, 95% confidence-level upper limits are obtained in the scalar-charm-neutralino mass plane such that, for neutralino masses below 200 GeV, scalar-charm masses up to 490 GeV are excluded. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.114.161801

Published
2015

27. Search for a Charged Higgs Boson Produced in the Vector-Boson Fusion Mode with Decay H-+/- -> W(+/-)Z using pp Collisions at root S=8 TeV with the ATLAS Experiment

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Condensed Matter::Quantum Gases, High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A search for a charged Higgs boson, H-+/-, decaying to a W-+/- boson and a Z boson is presented. The search is based on 20.3 fb(-1) of proton-proton collision data at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the LHC. The H-+/- boson is assumed to be produced via vector-boson fusion and the decays W-+/- -> q (q') over bar and Z -> e(+)e(-)/mu(+)mu(-) are considered. The search is performed in a range of charged Higgs boson masses from 200 to 1000 GeV. No evidence for the production of an H+ boson is observed. Upper limits of 31-1020 fb at 95% C.L. are placed on the cross section for vector-boson fusion production of an H-+/- boson times its branching fraction to W(+/-)Z. The limits are compared with predictions from the Georgi-Machacek Higgs triplet model. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.114.231801

Published
2015

28. Search for supersymmetry in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in root s=8TeV pp collisions with the ATLAS detector

Author

Aad, G., Bergeås Kuutmann, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel Smith, Camila, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Acceleratorfysik och instrumentering, Accelerator Physics and Instrumentation
Abstract

Two searches for supersymmetric particles in final states containing a same-flavour opposite-sign lepton pair, jets and large missing transverse momentum are presented. The proton-proton collision data used in these searches were collected at a centre-of-mass energy root s = 8TeV by the ATLAS detector at the Large Hadron Collider and corresponds to an integrated luminosity of 20.3 fb(-1). Two leptonic production mechanisms are considered: decays of squarks and gluinos with Z bosons in the final state, resulting in a peak in the dilepton invariant mass distribution around the Z-boson mass; and decays of neutralinos (e.g.. (chi) over tilde (0)(2) -> l(+)l(-) (chi) over tilde (0)(1)), resulting in a kinematic endpoint in the dilepton invariant mass distribution. For the former, an excess of events above the expected Standard Model background is observed, with a significance of three standard deviations. In the latter case, the data are well-described by the expected Standard Model background. The results from each channel are interpreted in the context of several supersymmetric models involving the production of squarks and gluinos. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3518-2Correction in: EUROPEAN PHYSICAL JOURNAL C, Volume: 75, Issue: 10, Article Number: 463, DOI: 10.1140/epjc/s10052-015-3661-9

Published
2015

29. Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at root s=8 TeV with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

The results of a search for supersymmetry in final states containing at least one isolated lepton (electron or muon), jets and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. The search is based on proton-proton collision data at a centre-of-mass energy root s = 8 TeV collected in 2012, corresponding to an integrated luminosity of 20 fb(-1). No significant excess above the Standard Model expectation is observed. Limits are set on supersymmetric particle masses for various supersymmetric models. Depending on the model, the search excludes gluino masses up to 1.32 TeV and squark masses up to 840 GeV. Limits are also set on the parameters of a minimal universal extra dimension model, excluding a compactification radius of 1/R-c = 950 GeV for a cut-off scale times radius (Lambda R-c) of approximately 30. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP04(2015)116

Published
2015

30. Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

Results of a search for H -> tau tau decays are presented, based on the full set of proton-proton collision data recorded by the ATLAS experiment at the LHC during 2011 and 2012. The data correspond to integrated luminosities of 4.5 fb(-1) and 20.3 fb(-1) at centre-of-mass energies of root s = 7TeV and root s = 8 TeV respectively. All combinations of leptonic (tau -> l nu(nu) over bar with l = e, mu) and hadronic (tau -> hadrons nu) tau decays are considered. An excess of events over the expected background from other Standard Model processes is found with an observed (expected) significance of 4.5 (3.4) standard deviations. This excess provides evidence for the direct coupling of the recently discovered Higgs boson to fermions. The measured signal strength, normalised to the Standard Model expectation, of mu = 1.43(-0.37)(+0.43) is consistent with the predicted Yukawa coupling strength in the Standard Model. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.114.161801

Published
2015

31. Search for new phenomena in events with a photon and missing transverse momentum in pp collisions at root s = 8 TeV with the ATLAS detector

Author

Aad, G., Bergeås Kuutmann, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camila, and Zwalinski, L.

Subjects
Physical Sciences, Fysik
Abstract

Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the LHC are reported. Data were collected in proton-proton collisions at a center-of-mass energy of 8 TeVand correspond to an integrated luminosity of 20.3 fb(-1). The observed data are well described by the expected Standard Model backgrounds. The expected (observed) upper limit on the fiducial cross section for the production of events with a photon and large missing transverse momentum is 6.1 (5.3) fb at 95% confidence level. Exclusion limits are presented on models of new phenomena with large extra spatial dimensions, supersymmetric quarks, and direct pair production of dark-matter candidates. ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1103/PhysRevD.91.012008

Published
2015

32. Search for vectorlike B quarks in events with one isolated lepton, missing transverse momentum, and jets at root s=8 TeV with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A search has been performed for pair production of heavy vectorlike down-type (B) quarks. The analysis explores the lepton-plus-jets final state, characterized by events with one isolated charged lepton (electron or muon), significant missing transverse momentum, and multiple jets. One or more jets are required to be tagged as arising from b quarks, and at least one pair of jets must be tagged as arising from the hadronic decay of an electroweak boson. The analysis uses the full data sample of pp collisions recorded in 2012 by the ATLAS detector at the LHC, operating at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb(-1). No significant excess of events is observed above the expected background. Limits are set on vectorlike B production, as a function of the B branching ratios, assuming the allowable decay modes are B -> Wt/Zb/Hb. In the chiral limit with a branching ratio of 100% for the decay B -> Wt, the observed (expected) 95% C.L. lower limit on the vectorlike B mass is 810 GeV (760 GeV). In the case where the vectorlike B quark has branching ratio values corresponding to those of an SU(2) singlet state, the observed (expected) 95% C.L. lower limit on the vectorlike B mass is 640 GeV (505 GeV). The same analysis, when used to investigate pair production of a colored, charge 5/3 exotic fermion T-5/3, with subsequent decay T-5/3 -> Wt, sets an observed (expected) 95% C.L. lower limit on the T-5/3 mass of 840 GeV (780 GeV). ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevD.91.112011

Published
2015

33. Searches for heavy long-lived charged particles with the ATLAS detector in proton-proton collisions at root s=8 TeV

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Searches for heavy long-lived charged particles are performed using a data sample of 19.1 fb(-1) from proton-proton collisions at a centre-of-mass energy of root s = 8 TeV collected by the ATLAS detector at the Large Hadron Collider. No excess is observed above the estimated background and limits are placed on the mass of long-lived particles in various supersymmetric models. Long-lived tau sleptons in models with gauge-mediated symmetry breaking are excluded up to masses between 440 and 385 GeV for tan,3 between 10 and 50, with a 290 GeV limit in the case where only direct tau slepton production is considered. In the context of simplified LeptoSUSY models, where sleptons are stable and have a mass of 300 GeV, squark and gluino masses are excluded up to a mass of 1500 and 1360 GeV, respectively. Directly produced charginos, in simplified models where they are nearly degenerate to the lightest neutralino, are excluded up to a mass of 620 GeV. R-hadrons, composites containing a gluino, bottom squark or top squark, are excluded up to a mass of 1270, 845 and 900 GeV, respectively, using the full detector; and up to a mass of 1260, 835 and 870 GeV using an approach disregarding information from the muon spectrometer. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP01(2015)068

Published
2015

34. Search for the Standard Model Higgs boson produced in association with top quarks and decaying into in collisions at with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A search for the Standard Model Higgs boson produced in association with a top-quark pair, , is presented. The analysis uses 20.3 fb(-1) of pp collision data at , collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by +jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the Standard Model cross section is obtained at 95 % confidence level. The ratio of the measured signal cross section to the Standard Model expectation is found to be assuming a Higgs boson mass of 125 Gev. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3543-1

Published
2015

35. Combined Measurement of the Higgs Boson Mass in pp Collisions at root s=7 and 8 TeV with the ATLAS and CMS Experiments

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H --> gamma gamma and H --> ZZ --> 4l decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is m(H) = 125.09 +/- 0.21 (stat) +/- 0.11 (syst) GeV. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.114.191803

Published
2015

36. Centrality and rapidity dependence of inclusive jet production in root(NN)-N-S=5.02 TeV proton-lead collisions with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik
Abstract

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1016/j.physletb.2015.07.023

Published
2015

37. Search for new phenomena in events with three or more charged leptons in pp collisions at TeV with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A generic search for anomalous production of events with at least three charged leptons is presented. The data sample consists of pp collisions at \( \sqrt{s}=8 \) TeV collected in 2012 by the ATLAS experiment at the CERN Large Hadron Collider, and corresponds to an integrated luminosity of 20.3 fb−1. Events are required to have at least three selected lepton candidates, at least two of which must be electrons or muons, while the third may be a hadronically decaying tau. Selected events are categorized based on their lepton flavour content and signal regions are constructed using several kinematic variables of interest. No significant deviations from Standard Model predictions are observed. Model-independent upper limits on contributions from beyond the Standard Model phenomena are provided for each signal region, along with prescription to re-interpret the limits for any model. Constraints are also placed on models predicting doubly charged Higgs bosons and excited leptons. For doubly charged Higgs bosons decaying to eτ or μτ, lower limits on the mass are set at 400 GeV at 95% confidence level. For excited leptons, constraints are provided as functions of both the mass of the excited state and the compositeness scale Λ, with the strongest mass constraints arising in regions where the mass equals Λ. In such scenarios, lower mass limits are set at 3.0 TeV for excited electrons and muons, 2.5 TeV for excited taus, and 1.6 TeV for every excited-neutrino flavour. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP08(2015)138

Published
2015

38. Determination of the top-quark pole mass using t(t)over-bar+1-jet events collected with theATLAS experiment in 7 TeV pp collisions

Author

Aad, G., Bergeås Kuutmann, Elin, Brenner, Richard, Buszello, Claus P, Ekelöf, Tord, Ellert, Mattias, Feldin, O L, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Subatomär fysik, Subatomic Physics, Acceleratorfysik och instrumentering, Hadron-Hadron Scattering, Top physics, Accelerator Physics and Instrumentation
Abstract

The normalized differential cross section for top-quark pair production in association with at least one jet is studied as a function of the inverse of the invariant mass of the t (t) over bar + 1-jet system. This distribution can be used for a precise determination of the top-quark mass since gluon radiation depends on the mass of the quarks. The experimental analysis is based on proton-proton collision data collected by the ATLAS detector at the LHC with a centre-of-mass energy of 7TeV corresponding to an integrated luminosity of 4.6 fb(-1). The selected events were identified using the lepton+jets top-quark-pair decay channel, where lepton refers to either an electron or a muon. The observed distribution is compared to a theoretical prediction at next-to-leading-order accuracy in quantum chromodynamics using the pole-mass scheme. With this method, the measured value of the top-quark pole mass, m(t)(pole), is: m(t)(pole) t = 173.7 +/- 1.5 (stat.) +/- 1.4 (syst.)(-0.5)(+1.0) (theory) GeV. This result represents the most precise measurement of the top-quark pole mass to date. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP10(2015)121Funding: We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZS Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America.

Published
2015

39. Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at root s=7 TeV using the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A measurement of the top-antitop (t (t) over bar) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb(-1) of LHC pp collisions at a centre-of-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: A(C)(ll) based on the identified charged leptons, and A(C)(t (t) over bar), based on the reconstructed t (t) over bar final state. The asymmetries are measured to be A(C)(ll) =0.024 +/- 0.015 (stat.) +/- 0.009 (syst.), A(C)(t (t) over bar) = 0.021 +/- 0.025 (stat.) +/- 0.017 (syst.). The measured values are in agreement with the Standard Model predictions. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP05(2015)061

Published
2015

40. Search for a Heavy Neutral Particle Decaying to e mu, e tau, or mu tau in pp Collisions at root s=8 TeV with the ATLAS Detector

Author

Aad, G., Bergeås Kuutmann, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel Smith, Camila, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Acceleratorfysik och instrumentering, Accelerator Physics and Instrumentation
Abstract

This Letter presents a search for a heavy neutral particle decaying into an opposite-sign different-flavor dilepton pair, e(+/-) mu(-/+), e(+/-) tau(-/+), or mu(+/-) tau(-/+) using 20.3 fb(-1) of pp collision data at root s = 8 TeV collected by the ATLAS detector at the LHC. The numbers of observed candidate events are compatible with the standard model expectations. Limits are set on the cross section of new phenomena in two scenarios: the production of (nu) over tilde (tau) in R-parity-violating supersymmetric models and the production of a lepton-flavor-violating Z' vector boson. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.115.031801

Published
2015

41. Performance of the ATLAS muon trigger in pp collisions at root s=8 TeV

Author

Aad, G., Brenner, Richard, Buszello, Claus P., Coniavitis, Elias, Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, Valero, Anthony, and Zwalinski, L.

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics, High Energy Physics::Experiment, Acceleratorfysik och instrumentering, Accelerator Physics and Instrumentation
Abstract

The performance of the ATLAS muon trigger system is evaluated with proton-proton collision data collected in 2012 at the Large Hadron Collider at a centre-of-mass energy of 8TeV. It is primarily evaluated using events containing a pair of muons from the decay of Z bosons. The efficiency of the single-muon trigger is measured for muons with transverse momentum 25 < pT < 100 GeV, with a statistical uncertainty of less than 0.01% and a systematic uncertainty of 0.6%. The pT range for efficiency determination is extended by using muons from decays of J/Psi mesons, W bosons, and top quarks. The muon trigger shows highly uniform and stable performance. The performance is compared to the prediction of a detailed simulation. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3325-9

Published
2015

42. Search for pair-produced long-lived neutral particles decaying to jets in the ATLAS hadronic calorimeter in pp collisions at root s=8 TeV

Author

Aad, G., Bergeås Kuutmaan, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay of a scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in 20.3 fb−120.3 fb−1 of data collected in proton–proton collisions at s=8 TeV. This search is sensitive to long-lived particles that decay to Standard Model particles producing jets at the outer edge of the ATLAS electromagnetic calorimeter or inside the hadronic calorimeter. No significant excess of events is observed. Limits are reported on the product of the scalar boson production cross section times branching ratio into long-lived neutral particles as a function of the proper lifetime of the particles. Limits are reported for boson masses from 100 GeV to 900 GeV, and a long-lived neutral particle mass from 10 GeV to 150 GeV. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1016/j.physletb.2015.02.015

Published
2015

43. Search for New Phenomena in Dijet Angular Distributions in Proton-Proton Collisions at root s=8 TeV Measured with the ATLAS Detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel Smith, Camila, and Zwalinski, L.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A search for new phenomena in LHC proton-proton collisions at a center-of-mass energy of root s = 8 TeV was performed with the ATLAS detector using an integrated luminosity of 17.3 fb(-1). The angular distributions are studied in events with at least two jets; the highest dijet mass observed is 5.5 TeV. All angular distributions are consistent with the predictions of the standard model. In a benchmark model of quark contact interactions, a compositeness scale below 8.1 TeV in a destructive interference scenario and 12.0 TeV in a constructive interference scenario is excluded at 95% C.L.; median expected limits are 8.9 TeV for the destructive interference scenario and 14.1 TeV for the constructive interference scenario. ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1103/PhysRevLett.114.221802

Published
2015

44. Measurement of the tt¯ production cross-section as a function of jet multiplicity and jet transverse momentum in 7 TeV proton-proton collisions with the ATLAS detector

Author

Aad, G., Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik
Abstract

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP01(2015)020

Published
2015

45. Search for invisible decays of the Higgs boson produced in association with a hadronically decaying vector boson in pp collisions at, root s=8 TeV with the ATLAS detector

Author

Aad, G., Bergeås Kuutmann, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Subatomär fysik, Physical Sciences, Subatomic Physics, Fysik
Abstract

A search for Higgs boson decays to invisible particles is performed using 20,3 of fb(-1) collision data at a centre-of-mass energy of 8 TeV recorded by the ArL As detector at the Large IHIadron Collider. The process considered is Higgs boson production in association with a vector boson (V = W or Z) that decays hadronically, resulting in events with two or more jets and large missing transverse momentum. No excess of candidates is observed in the data over the background expectation. The results are used to constrain V H production followed by H decaying to invisible particles for the Higgs boson mass range 115 < m(H) < 300 GeV. The 95 % confidence-level observed upper limit on sigma vH x BR(H -> inv.) varies from 1.6 pb at 115 GeV to 0.13 ph at 300 GeV. Assuming Standard Model production and including the gg -> H contribution as signal, the results also lead to an observed upper limit of 78 c/c at 95 % confidence level on the branching ratio of Higgs bosons decays to invisible particles at a mass of 125 GeV. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3551-1Funding: We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWTW and EWE, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNN and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, IIGT, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; RGC, Hong Kong SAR, China; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGE (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.

Published
2015

46. Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at root s=7 TeV

Author

Aad, G., Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Lancon, E., Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

The mass of the top quark is measured in a data set corresponding to 4.6 fb(-1) of proton-proton collisions with centre-of-mass energy root s = 7 TeV collected by the ATLAS detector at the LHC. Events consistent with hadronic decays of top-antitop quark pairs with at least six jets in the final state are selected. The substantial background from multijet production is modelled with data-driven methods that utilise the number of identified b-quark jets and the transverse momentum of the sixth leading jet, which have minimal correlation. The top-quark mass is obtained from template fits to the ratio of three-jet to dijet mass. The three-jet mass is calculated from the three jets produced in a top-quark decay. Using these three jets the dijet mass is obtained from the two jets produced in the W boson decay. The top-quark mass obtained from this fit is thus less sensitive to the uncertainty in the energy measurement of the jets. A binned likelihood fit yields a top-quark mass of ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3373-1

Published
2015

47. Search for resonant diboson production in the llq(q)over-bar final state in pp collisions at root s=8 TeV with the ATLAS detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

This paper reports on a search for narrow resonances in diboson production in the llq (q) over bar final state using pp collision data corresponding to an integrated luminosity of 20 fb(-1) collected at root s = 8 TeV with the ATLAS detector at the Large Hadron Collider. No significant excess of data events over the Standard Model expectation is observed. Upper limits at the 95 % confidence level are set on the production cross section times branching ratio for Kaluza-Klein gravitons predicted by the Randall-Sundrum model and for Extended Gauge Model W' bosons. These results lead to the exclusion of mass values below 740 and 1590 GeV for the graviton and W' boson respectively. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3261-8

Published
2015

48. Measurement of the top quark mass in the t(t)over-bar -> lepton plus jets and t(t)over-bar -> dilepton channels using root s=7 TeV ATLAS data

Author

Aad, G., Bergeås Kuutmaan, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik
Abstract

The top quark mass was measured in the channels t (t) over bar -> lepton+jets and t (t) over bar -> dilepton (lepton = e, mu) based on ATLAS data recorded in 2011. The data were taken at the LHC with a proton-proton centre-of-mass energy of root s = 7 TeV and correspond to an integrated luminosity of 4.6 fb(-1). The t (t) over bar -> lepton+jets analysis uses a three-dimensional template technique which determines the top quark mass together with a global jet energy scale factor (JSF), and a relative b-to-light-jet energy scale factor (bJSF), where the terms b-jets and light-jets refer to jets originating from b-quarks and u,d,c, s-quarks or gluons, respectively. The analysis of the t (t) over bar -> dilepton channel exploits a one-dimensional template method using the m(lb) observable, defined as the average invariant mass of the two lepton+b-jet pairs in each event. The top quark mass is measured to be 172.33 +/- 0.75(stat + JSF + bJSF) +/- 1.02(syst) GeV, and 173.79 +/- 0.54(stat) +/- 1.30(syst) GeV in the t (t) over bar -> lepton+jets and t (t) over bar -> dilepton channels, respectively. The combination of the two results yields m(top) = 172.99 +/- 0.48(stat) +/- 0.78(syst) GeV, with a total uncertainty of 0.91 GeV. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3544-0Funding: We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; RGC, Hong Kong SAR, China; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.

Published
2015

49. Search for Higgs bosons decaying to aa in the μμττ final state in pp collisions at √s = 8 TeV with the ATLAS experiment

Author

Aad, G., Bergeås Kuutmann, Elin, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
High Energy Physics::Phenomenology, Physical Sciences, Fysik, High Energy Physics::Experiment
Abstract

A search for the decay to a pair of new particles of either the 125 GeV Higgs boson (h) or a second charge parity (CP)-even Higgs boson (H) is presented. The data set corresponds to an integrated luminosity of 20.3 fb−1 of pp collisions at √s=8 TeV recorded by the ATLAS experiment at the LHC in 2012. The search was done in the context of the next-to-minimal supersymmetric standard model, in which the new particles are the lightest neutral pseudoscalar Higgs bosons (a). One of the two a bosons is required to decay to two muons while the other is required to decay to two τ leptons. No significant excess is observed above the expected backgrounds in the dimuon invariant mass range from 3.7 to 50 GeV. Upper limits are placed on the production of h→aa relative to the standard model gg→h production, assuming no coupling of the a boson to quarks. The most stringent limit is placed at 3.5% for ma=3.75 GeV. Upper limits are also placed on the production cross section of H→aa from 2.33 to 0.72 pb, for fixed ma=5 GeV with mH ranging from 100 to 500 GeV. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevD.92.052002Title in Web of Science: Search for Higgs bosons decaying to aa in the mu mu tau tau final state in pp collisions at root s=8 TeV with the ATLAS experiment

Published
2015

50. Evidence of W gamma gamma Production in pp Collisions at root s=8 TeV and Limits on Anomalous Quartic Gauge Couplings with the ATLAS Detector

Author

Aad, G., Bergeås, Elin Kuutmann, Brenner, Richard, Buszello, Claus P., Ekelöf, Tord, Ellert, Mattias, Ferrari, Arnaud, Isaksson, Charlie, Madsen, Alexander, Öhman, Henrik, Pelikan, Daniel, Rangel-Smith, Camilla, and Zwalinski, L.

Subjects
Physical Sciences, Fysik
Abstract

This Letter reports evidence of triple gauge boson production pp -> W(l nu)gamma gamma + X, which is accessible for the first time with the 8 TeV LHC data set. The fiducial cross section for this process is measured in a data sample corresponding to an integrated luminosity of 20.3 fb(-1), collected by the ATLAS detector in 2012. Events are selected using the W boson decay to e nu or mu nu as well as requiring two isolated photons. The measured cross section is used to set limits on anomalous quartic gauge couplings in the high diphoton mass region. ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.115.031802

Published
2015

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