Direct Optical Coupling to an Unoccupied Dirac Surface State in the Topological Insulator Bi2_2Se3_3

We characterize the occupied and unoccupied electronic structure of the topological insulator Bi$_2$Se$_3$ by one-photon and two-photon angle-resolved photoemission spectroscopy and slab band structure calculations. We reveal a second, unoccupied Dirac surface state with similar electronic structure and physical origin to the well-known topological surface state. This state is energetically located 1.5 eV above the conduction band, which permits it to be directly excited by the output of a Ti:Sapphire laser. This discovery demonstrates the feasibility of direct ultrafast optical coupling to a topologically protected, spin-textured surface state.Comment: Accepted to Physical Review Letter

Hitomi (ASTRO-H) X-ray Astronomy Satellite

The Hitomi (ASTRO-H) mission is the sixth Japanese x-ray astronomy satellite developed by a large international collaboration, including Japan, USA, Canada, and Europe. The mission aimed to provide the highest energy resolution ever achieved at E  >  2  keV, using a microcalorimeter instrument, and to cover a wide energy range spanning four decades in energy from soft x-rays to gamma rays. After a successful launch on February 17, 2016, the spacecraft lost its function on March 26, 2016, but the commissioning phase for about a month provided valuable information on the onboard instruments and the spacecraft system, including astrophysical results obtained from first light observations. The paper describes the Hitomi (ASTRO-H) mission, its capabilities, the initial operation, and the instruments/spacecraft performances confirmed during the commissioning operations for about a month

SuperB Progress Reports - Detector

none240This report describes the present status of the detector design for SuperB. It is one of four separate progress reports that, taken collectively, describe progress made on the SuperB Project since the publication of the SuperB Conceptual Design Report in 2007 and the Proceedings of SuperB Workshop VI in Valencia in 2008. The other three reports relate to Physics, Accelerator and Computing.noneE. Grauges; G. Donvito; V. Spinoso; M. Manghisoni; V. Re; G. Traversi; G. Eigen; D. Fehlker; L. Helleve; A. Carbone; R. Di Sipio; A. Gabrielli; D. Galli; F. Giorgi; U. Marconi; S. Perazzini; C. Sbarra; V. Vagnoni; S. Valentinetti; M. Villa; A. Zoccoli; C. Cheng; A. Chivukula; D. Doll; B. Echenard; D. Hitlin; P. Ongmongkolkul; F. Porter; A. Rakitin; M. Thomas; R. Zhu; G. Tatishvili; R. Andreassen; C. Fabby; B. Meadows; A. Simpson; M. Sokoloff; K. Tomko; A. Fella; M. Andreotti; W. Baldini; R. Calabrese; V. Carassiti; G. Cibinetto; A. Cotta Ramusino; A. Gianoli; E. Luppi; M. Munerato; V. Santoro; L. Tomassetti; D. Stoker; O. Bezshyyko; G. Dolinska; N. Arnaud; C. Beigbeder; F. Bogard; D. Breton; L. Burmistrov; D. Charlet; J. Maalmi; L. Perez; V. Puill; A. Stocchi; V. Tocut; S. Wallon; G. Wormser; D. Brown; A. Calcaterra; R. de Sangro; G. Felici; G. Finocchiaro; P. Patteri; I. Peruzzi; M. Piccolo; M. Rama; S. Fantinel; G. Maron; E. Ben-Haim; G. Calderini; H. Lebbolo; G. Marchiori; R. Cenci; A. Jawahery; D.A. Roberts; D. Lindemann; P. Patel; S. Robertson; D. Swersky; P. Biassoni; M. Citterio; V. Liberali; F. Palombo; A. Stabile; S. Stracka; A. Aloisio; S. Cavaliere; G. De Nardo; A. Doria; R. Giordano; A. Ordine; S. Pardi; G. Russo; C. Sciacca; A.Y. Barniakov; M.Y. Barniakov; V.E. Blinov; V.P. Druzhinin; V.B.. Golubev; S.A. Kononov; E. Kravchenko; A.P. Onuchin; S.I. Serednyakov; Y.I. Skovpen; E.P. Solodov; M. Bellato; M. Benettoni; M. Corvo; A. Crescente; F. Dal Corso; C. Fanin; E. Feltresi; N. Gagliardi; M. Morandin; M. Posocco; M. Rotondo; R. Stroili; C. Andreoli; L. Gaioni; E. Pozzati; L. Ratti; V. Speziali; D. Aisa; M. Bizzarri; C. Cecchi; S. Germani; P. Lubrano; E. Manoni; A. Papi; A. Piluso ; A. Rossi; M. Lebeau; C. Avanzini; G. Batignani; S. Bettarini; F. Bosi; M. Ceccanti; A. Cervelli; A. Ciampa; F. Crescioli; M. Dell’Orso; D. Fabiani; F. Forti; P. Giannetti; M. Giorgi; S. Gregucci; A. Lusiani; P. Mammini; G. Marchiori; M. Massa; E. Mazzoni; F. Morsani; N. Neri; E. Paoloni; E. Paoloni; M. Piendibene; A. Profeti; G. Rizzo; L. Sartori; J. Walsh; E. Yurtsev; D.M. Asner; J. E. Fast; R.T. Kouzes; A. Bevan; F. Gannaway; J. Mistry; C. Walker; C.A.J. Brew; R.E. Coath; J.P. Crooks; R.M. Harper; A. Lintern; A. Nichols; M. Staniztki; R. Turchetta; F.F. Wilson; V. Bocci; G. Chiodi; R. Faccini; C. Gargiulo; D. Pinci; L. Recchia; D. Ruggieri; A. Di Simone; P. Branchini; A. Passeri; F. Ruggieri; E. Spiriti; D. Aston; M. Convery; G. Dubois-Felsmann; W. Dunwoodie; M. Kelsey; P. Kim; M. Kocian; D. Leith; S. Luitz; D. MacFarlane; B. Ratcliff; M. Sullivan; J. Va’vra; W. Wisniewski; W. Yang; K. Shougaev; A. Soffer; F. Bianchi; D. Gamba; G. Giraudo; P. Mereu; G. Dalla Betta; G. Fontana; G. Soncini; M. Bomben; L. Bosisio; P. Cristaudo; G. Giacomini; D. Jugovaz; L. Lanceri; I. Rashevskaya; G. Venier; L. Vitale; R. Henderson; J.-F. Caron; C. Hearty; P. Lu; R. So; P. Taras; A. Agarwal; J. Franta; J.M. RoneyE., Grauges; G., Donvito; V., Spinoso; M., Manghisoni; V., Re; G., Traversi; G., Eigen; D., Fehlker; L., Helleve; A., Carbone; R., Di Sipio; A., Gabrielli; D., Galli; F., Giorgi; U., Marconi; S., Perazzini; C., Sbarra; V., Vagnoni; S., Valentinetti; M., Villa; A., Zoccoli; C., Cheng; A., Chivukula; D., Doll; B., Echenard; D., Hitlin; P., Ongmongkolkul; F., Porter; A., Rakitin; M., Thomas; R., Zhu; G., Tatishvili; R., Andreassen; C., Fabby; B., Meadows; A., Simpson; M., Sokoloff; K., Tomko; A., Fella; Andreotti, Mirco; Baldini, Wander; Calabrese, Roberto; Carassiti, Vittore; Cibinetto, Gianluigi; COTTA RAMUSINO, Angelo; Gianoli, Alberto; Luppi, Eleonora; Munerato, Mauro; Santoro, Valentina; Tomassetti, Luca; D., Stoker; O., Bezshyyko; G., Dolinska; N., Arnaud; C., Beigbeder; F., Bogard; D., Breton; L., Burmistrov; D., Charlet; J., Maalmi; L., Perez; V., Puill; A., Stocchi; V., Tocut; S., Wallon; G., Wormser; D., Brown; A., Calcaterra; R., de Sangro; G., Felici; G., Finocchiaro; P., Patteri; I., Peruzzi; M., Piccolo; M., Rama; S., Fantinel; G., Maron; E., Ben Haim; G., Calderini; H., Lebbolo; G., Marchiori; R., Cenci; A., Jawahery; D. A., Roberts; D., Lindemann; P., Patel; S., Robertson; D., Swersky; P., Biassoni; M., Citterio; V., Liberali; F., Palombo; A., Stabile; S., Stracka; A., Aloisio; S., Cavaliere; G., De Nardo; A., Doria; R., Giordano; A., Ordine; S., Pardi; G., Russo; C., Sciacca; A. Y., Barniakov; M. Y., Barniakov; V. E., Blinov; V. P., Druzhinin; Golubev, V. B.; S. A., Kononov; E., Kravchenko; A. P., Onuchin; S. I., Serednyakov; Y. I., Skovpen; E. P., Solodov; M., Bellato; M., Benettoni; Corvo, Marco; A., Crescente; F., Dal Corso; C., Fanin; E., Feltresi; N., Gagliardi; M., Morandin; M., Posocco; M., Rotondo; R., Stroili; C., Andreoli; L., Gaioni; E., Pozzati; L., Ratti; V., Speziali; D., Aisa; M., Bizzarri; C., Cecchi; S., Germani; P., Lubrano; E., Manoni; A., Papi; A., Piluso; A., Rossi; M., Lebeau; C., Avanzini; G., Batignani; S., Bettarini; F., Bosi; M., Ceccanti; A., Cervelli; A., Ciampa; F., Crescioli; M., Dell’Orso; D., Fabiani; F., Forti; P., Giannetti; M., Giorgi; S., Gregucci; A., Lusiani; P., Mammini; G., Marchiori; M., Massa; E., Mazzoni; F., Morsani; N., Neri; E., Paoloni; E., Paoloni; M., Piendibene; A., Profeti; G., Rizzo; L., Sartori; J., Walsh; E., Yurtsev; D. M., Asner; J. E., Fast; R. T., Kouzes; A., Bevan; F., Gannaway; J., Mistry; C., Walker; C. A. J., Brew; R. E., Coath; J. P., Crooks; R. M., Harper; A., Lintern; A., Nichols; M., Staniztki; R., Turchetta; F. F., Wilson; V., Bocci; G., Chiodi; R., Faccini; C., Gargiulo; D., Pinci; L., Recchia; D., Ruggieri; A., Di Simone; P., Branchini; A., Passeri; F., Ruggieri; E., Spiriti; D., Aston; M., Convery; G., Dubois Felsmann; W., Dunwoodie; M., Kelsey; P., Kim; M., Kocian; D., Leith; S., Luitz; D., Macfarlane; B., Ratcliff; M., Sullivan; J., Va’Vra; W., Wisniewski; W., Yang; K., Shougaev; A., Soffer; F., Bianchi; D., Gamba; G., Giraudo; P., Mereu; G., Dalla Betta; G., Fontana; G., Soncini; M., Bomben; L., Bosisio; P., Cristaudo; G., Giacomini; D., Jugovaz; L., Lanceri; I., Rashevskaya; G., Venier; L., Vitale; R., Henderson; J. F., Caron; C., Hearty; P., Lu; R., So; P., Taras; A., Agarwal; J., Franta; J. M., Rone

Measurement of the CP violating asymmetry amplitude sin 2beta

We present results on time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 million Y(4S) --> B Bbar decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B0bar from its decay products. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta = 0.741 +/- 0.067 (stat) +/- 0.034 (syst) and |lambda| = 0.948 +/- 0.051 (stat) +/- 0.030 (syst). The magnitude of lambda is consistent with unity, in agreement with the Standard Model expectation of no direct CP violation in these modes.Comment: 7 pages, 2 postscript figures, submitted to PR