Search for heavy, long-lived neutralinos that decay to photons at CDF II using photon timing

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T. Aaltonen²⁴, J. Adelman¹⁴, T. Akimoto⁵⁶, M. G. Albrow¹⁸, B. Álvarez González¹², S. Amerio^44,q, D. Amidei³⁵, A. Anastassov³⁹, A. Annovi²⁰, J. Antos¹⁵, G. Apollinari¹⁸, A. Apresyan⁴⁹, T. Arisawa⁵⁸, A. Artikov¹⁶, W. Ashmanskas¹⁸, A. Attal⁴, A. Aurisano⁵⁴, F. Azfar⁴³, P. Azzurri^47,o, W. Badgett¹⁸, A. Barbaro-Galtieri²⁹, V. E. Barnes⁴⁹, B. A. Barnett²⁶, V. Bartsch³¹, G. Bauer³³, P.-H. Beauchemin³⁴, F. Bedeschi⁴⁷, P. Bednar¹⁵, D. Beecher³¹, S. Behari²⁶, G. Bellettini^47,q, J. Bellinger⁶⁰, D. Benjamin¹⁷, A. Beretvas¹⁸, J. Beringer²⁹, A. Bhatti⁵¹, M. Binkley¹⁸, D. Bisello^44,q, I. Bizjak³¹, R. E. Blair², C. Blocker⁷, B. Blumenfeld²⁶, A. Bocci¹⁷, A. Bodek⁵⁰, V. Boisvert⁵⁰, G. Bolla⁴⁹, D. Bortoletto⁴⁹, J. Boudreau⁴⁸, A. Boveia¹¹, B. Brau¹¹, A. Bridgeman²⁵, L. Brigliadori⁴⁴, C. Bromberg³⁶, E. Brubaker¹⁴, J. Budagov¹⁶, H. S. Budd⁵⁰, S. Budd²⁵, K. Burkett¹⁸, G. Busetto^44,q, P. Bussey^22,t, A. Buzatu³⁴, K. L. Byrum², S. Cabrera^17,l, C. Calancha³², M. Campanelli³⁶, M. Campbell³⁵, F. Canelli¹⁸, A. Canepa⁴⁶, D. Carlsmith⁶⁰, R. Carosi⁴⁷, S. Carrillo^19,f, S. Carron³⁴, B. Casal¹², M. Casarsa¹⁸, A. Castro^6,p, P. Catastini^47,n, D. Cauz^55,s, V. Cavaliere^47,n, M. Cavalli-Sforza⁴, A. Cerri²⁹, L. Cerrito^31,j, S. H. Chang²⁸, Y. C. Chen¹, M. Chertok⁸, G. Chiarelli⁴⁷, G. Chlachidze¹⁸, F. Chlebana¹⁸, K. Cho²⁸, D. Chokheli¹⁶, J. P. Chou²³, G. Choudalakis³³, S. H. Chuang⁵³, K. Chung¹³, W. H. Chung⁶⁰, Y. S. Chung⁵⁰, C. I. Ciobanu⁴⁵, M. A. Ciocci^47,n, A. Clark²¹, D. Clark⁷, G. Compostella⁴⁴, M. E. Convery¹⁸, J. Conway⁸, K. Copic³⁵, M. Cordelli²⁰, G. Cortiana^44,q, D. J. Cox⁸, F. Crescioli^47,m, C. Cuenca Almenar^8,l, J. Cuevas^12,i, R. Culbertson¹⁸, J. C. Cully³⁵, D. Dagenhart¹⁸, M. Datta¹⁸, T. Davies²², P. de Barbaro⁵⁰, S. De Cecco⁵², A. Deisher²⁹, G. De Lorenzo⁴, M. Dell’Orso^47,m, C. Deluca⁴, L. Demortier⁵¹, J. Deng¹⁷, M. Deninno⁶, P. F. Derwent¹⁸, G. P. di Giovanni⁴⁵, C. Dionisi^52,r, B. Di Ruzza^55,s, J. R. Dittmann⁵, M. D’Onofrio⁴, S. Donati^47,m, P. Dong⁹, J. Donini⁴⁴, T. Dorigo⁴⁴, S. Dube⁵³, J. Efron⁴⁰, A. Elagin⁵⁴, R. Erbacher⁸, D. Errede²⁵, S. Errede²⁵, R. Eusebi¹⁸, H. C. Fang²⁹, S. Farrington⁴³, W. T. Fedorko¹⁴, R. G. Feild⁶¹, M. Feindt²⁷, J. P. Fernandez³², C. Ferrazza^47,o, R. Field¹⁹, G. Flanagan⁴⁹, R. Forrest⁸, M. Franklin²³, J. C. Freeman¹⁸, H. Frisch¹⁴, I. Furic¹⁹, M. Gallinaro⁵², J. Galyardt¹³, F. Garberson¹¹, J. E. Garcia⁴⁷, A. F. Garfinkel⁴⁹, P. Geffert⁵⁴, K. Genser¹⁸, H. Gerberich²⁵, D. Gerdes³⁵, A. Gessler²⁷, S. Giagu^52,r, V. Giakoumopoulou³, P. Giannetti⁴⁷, K. Gibson⁴⁸, J. L. Gimmell⁵⁰, C. M. Ginsburg¹⁸, N. Giokaris³, M. Giordani^55,s, P. Giromini²⁰, M. Giunta^47,m, G. Giurgiu²⁶, V. Glagolev¹⁶, D. Glenzinski¹⁸, M. Gold³⁸, N. Goldschmidt¹⁹, A. Golossanov¹⁸, G. Gomez¹², G. Gomez-Ceballos³³, M. Goncharov⁵⁴, O. González³², I. Gorelov³⁸, A. T. Goshaw¹⁷, K. Goulianos⁵¹, A. Gresele^44,q, S. Grinstein²³, C. Grosso-Pilcher¹⁴, R. C. Group¹⁸, U. Grundler²⁵, J. Guimaraes da Costa²³, Z. Gunay-Unalan³⁶, C. Haber²⁹, K. Hahn³³, S. R. Hahn¹⁸, E. Halkiadakis⁵³, B.-Y. Han⁵⁰, J. Y. Han⁵⁰, R. Handler⁶⁰, F. Happacher²⁰, K. Hara⁵⁶, D. Hare⁵³, M. Hare⁵⁷, S. Harper⁴³, R. F. Harr⁵⁹, R. M. Harris¹⁸, M. Hartz⁴⁸, K. Hatakeyama⁵¹, J. Hauser⁹, C. Hays⁴³, M. Heck²⁷, A. Heijboer⁴⁶, B. Heinemann²⁹, J. Heinrich⁴⁶, C. Henderson³³, M. Herndon⁶⁰, J. Heuser²⁷, S. Hewamanage⁵, D. Hidas¹⁷, C. S. Hill^11,††, D. Hirschbuehl²⁷, A. Hocker¹⁸, S. Hou¹, M. Houlden³⁰, S.-C. Hsu¹⁰, B. T. Huffman⁴³, R. E. Hughes⁴⁰, U. Husemann⁶¹, J. Huston³⁶, J. Incandela¹¹, G. Introzzi⁴⁷, M. Iori^52,r, A. Ivanov⁸, E. James¹⁸, B. Jayatilaka¹⁷, E. J. Jeon²⁸, M. K. Jha⁶, S. Jindariani¹⁸, W. Johnson⁸, M. Jones⁴⁹, K. K. Joo²⁸, S. Y. Jun¹³, J. E. Jung²⁸, T. R. Junk¹⁸, T. Kamon⁵⁴, D. Kar¹⁹, P. E. Karchin⁵⁹, Y. Kato⁴², R. Kephart¹⁸, J. Keung⁴⁶, V. Khotilovich⁵⁴, B. Kilminster⁴⁰, D. H. Kim²⁸, H. S. Kim²⁸, J. E. Kim²⁸, M. J. Kim²⁰, S. B. Kim²⁸, S. H. Kim⁵⁶, Y. K. Kim¹⁴, N. Kimura⁵⁶, L. Kirsch⁷, S. Klimenko¹⁹, B. Knuteson³³, B. R. Ko¹⁷, S. A. Koay¹¹, K. Kondo⁵⁸, D. J. Kong²⁸, J. Konigsberg¹⁹, A. Korytov¹⁹, A. V. Kotwal¹⁷, M. Kreps²⁷, J. Kroll⁴⁶, D. Krop¹⁴, N. Krumnack⁵, M. Kruse¹⁷, V. Krutelyov¹¹, T. Kubo⁵⁶, T. Kuhr²⁷, N. P. Kulkarni⁵⁹, M. Kurata⁵⁶, Y. Kusakabe⁵⁸, S. Kwang¹⁴, A. T. Laasanen⁴⁹, S. Lami⁴⁷, S. Lammel¹⁸, M. Lancaster³¹, R. L. Lander⁸, K. Lannon⁴⁰, A. Lath⁵³, G. Latino^47,n, I. Lazzizzera^44,q, T. LeCompte², E. Lee⁵⁴, S. W. Lee^54,k, S. Leone⁴⁷, J. D. Lewis¹⁸, C. S. Lin²⁹, J. Linacre⁴³, M. Lindgren¹⁸, E. Lipeles¹⁰, A. Lister⁸, D. O. Litvintsev¹⁸, C. Liu⁴⁸, T. Liu¹⁸, N. S. Lockyer⁴⁶, A. Loginov⁶¹, M. Loreti^44,q, L. Lovas¹⁵, R.-S. Lu¹, D. Lucchesi^44,q, J. Lueck²⁷, C. Luci^52,r, P. Lujan²⁹, P. Lukens¹⁸, G. Lungu⁵¹, L. Lyons⁴³, J. Lys²⁹, R. Lysak¹⁵, E. Lytken⁴⁹, P. Mack²⁷, D. MacQueen³⁴, R. Madrak¹⁸, K. Maeshima¹⁸, K. Makhoul³³, T. Maki²⁴, P. Maksimovic²⁶, S. Malde⁴³, S. Malik³¹, G. Manca³⁰, A. Manousakis-Katsikakis³, F. Margaroli⁴⁹, C. Marino²⁷, C. P. Marino²⁵, A. Martin⁶¹, V. Martin^22,e, M. Martínez⁴, R. Martínez-Ballarín³², T. Maruyama⁵⁶, P. Mastrandrea⁵², T. Masubuchi⁵⁶, M. E. Mattson⁵⁹, P. Mazzanti⁶, K. S. McFarland⁵⁰, P. McIntyre⁵⁴, R. McNulty^30,d, A. Mehta³⁰, P. Mehtala²⁴, A. Menzione⁴⁷, P. Merkel⁴⁹, C. Mesropian⁵¹, T. Miao¹⁸, N. Miladinovic⁷, R. Miller³⁶, C. Mills²³, M. Milnik²⁷, A. Mitra¹, G. Mitselmakher¹⁹, H. Miyake⁵⁶, N. Moggi⁶, C. S. Moon²⁸, R. Moore¹⁸, M. J. Morello^47,m, J. Morlok²⁷, P. Movilla Fernandez¹⁸, J. Mülmenstädt²⁹, A. Mukherjee¹⁸, Th. Muller²⁷, R. Mumford²⁶, P. Murat¹⁸, M. Mussini^6,p, J. Nachtman¹⁸, Y. Nagai⁵⁶, A. Nagano⁵⁶, J. Naganoma⁵⁸, K. Nakamura⁵⁶, I. Nakano⁴¹, A. Napier⁵⁷, V. Necula¹⁷, C. Neu⁴⁶, M. S. Neubauer²⁵, J. Nielsen^29,a, L. Nodulman², M. Norman¹⁰, O. Norniella²⁵, E. Nurse³¹, L. Oakes⁴³, S. H. Oh¹⁷, Y. D. Oh²⁸, I. Oksuzian¹⁹, T. Okusawa⁴², R. Orava²⁴, K. Osterberg²⁴, S. Pagan Griso^44,q, C. Pagliarone⁴⁷, E. Palencia¹⁸, V. Papadimitriou¹⁸, A. Papaikonomou²⁷, A. A. Paramonov¹⁴, B. Parks⁴⁰, S. Pashapour³⁴, R. Patel⁵⁴, J. Patrick¹⁸, G. Pauletta^55,s, M. Paulini¹³, C. Paus³³, D. E. Pellett⁸, A. Penzo⁵⁵, T. J. Phillips¹⁷, G. Piacentino⁴⁷, E. Pianori⁴⁶, L. Pinera¹⁹, K. Pitts²⁵, C. Plager⁹, L. Pondrom⁶⁰, O. Poukhov^16,*, N. Pounder⁴³, F. Prakoshyn¹⁶, A. Pronko¹⁸, J. Proudfoot², F. Ptohos^18,c, E. Pueschel¹³, G. Punzi^47,m, J. Pursley⁶⁰, J. Rademacker^43,††, A. Rahaman⁴⁸, V. Ramakrishnan⁶⁰, N. Ranjan⁴⁹, I. Redondo³², B. Reisert¹⁸, V. Rekovic³⁸, P. Renton⁴³, M. Rescigno⁵², S. Richter²⁷, F. Rimondi^6,p, L. Ristori⁴⁷, A. Robson²², T. Rodrigo¹², T. Rodriguez⁴⁶, E. Rogers²⁵, S. Rolli⁵⁷, R. Roser¹⁸, M. Rossi⁵⁵, R. Rossin¹¹, P. Roy³⁴, A. Ruiz¹², J. Russ¹³, V. Rusu¹⁸, H. Saarikko²⁴, A. Safonov⁵⁴, W. K. Sakumoto⁵⁰, O. Saltó⁴, L. Santi^55,s, S. Sarkar^52,r, L. Sartori⁴⁷, K. Sato¹⁸, A. Savoy-Navarro⁴⁵, T. Scheidle²⁷, P. Schlabach¹⁸, A. Schmidt²⁷, E. E. Schmidt¹⁸, M. A. Schmidt¹⁴, M. P. Schmidt^61,†, M. Schmitt³⁹, T. Schwarz⁸, L. Scodellaro¹², A. L. Scott¹¹, A. Scribano^47,n, F. Scuri⁴⁷, A. Sedov⁴⁹, S. Seidel³⁸, Y. Seiya⁴², A. Semenov¹⁶, L. Sexton-Kennedy¹⁸, A. Sfyrla²¹, S. Z. Shalhout⁵⁹, T. Shears³⁰, P. F. Shepard⁴⁸, D. Sherman²³, M. Shimojima^56,h, S. Shiraishi¹⁴, M. Shochet¹⁴, Y. Shon⁶⁰, I. Shreyber³⁷, A. Sidoti⁴⁷, P. Sinervo³⁴, A. Sisakyan¹⁶, A. J. Slaughter¹⁸, J. Slaunwhite⁴⁰, K. Sliwa⁵⁷, J. R. Smith⁸, F. D. Snider¹⁸, R. Snihur³⁴, A. Soha⁸, S. Somalwar⁵³, V. Sorin³⁶, J. Spalding¹⁸, T. Spreitzer³⁴, P. Squillacioti^47,n, M. Stanitzki⁶¹, R. St. Denis²², B. Stelzer⁹, O. Stelzer-Chilton⁴³, D. Stentz³⁹, J. Strologas³⁸, D. Stuart¹¹, J. S. Suh²⁸, A. Sukhanov¹⁹, I. Suslov¹⁶, T. Suzuki⁵⁶, A. Taffard^25,‡‡, R. Takashima⁴¹, Y. Takeuchi⁵⁶, R. Tanaka⁴¹, M. Tecchio³⁵, P. K. Teng¹, K. Terashi⁵¹, J. Thom^18,b, A. S. Thompson²², G. A. Thompson²⁵, E. Thomson⁴⁶, P. Tipton⁶¹, V. Tiwari¹³, S. Tkaczyk¹⁸, D. Toback⁵⁴, S. Tokar¹⁵, K. Tollefson³⁶, T. Tomura⁵⁶, D. Tonelli¹⁸, S. Torre²⁰, D. Torretta¹⁸, P. Totaro^55,s, S. Tourneur⁴⁵, Y. Tu⁴⁶, N. Turini^47,n, F. Ukegawa⁵⁶, S. Vallecorsa²¹, N. van Remortel^24,§, A. Varganov³⁵, E. Vataga^47,o, F. Vázquez^19,f, G. Velev¹⁸, C. Vellidis³, V. Veszpremi⁴⁹, M. Vidal³², R. Vidal¹⁸, I. Vila¹², R. Vilar¹², T. Vine³¹, M. Vogel³⁸, I. Volobouev^29,k, G. Volpi^47,m, F. Würthwein¹⁰, P. Wagner⁵⁴, R. G. Wagner², R. L. Wagner¹⁸, J. Wagner-Kuhr²⁷, W. Wagner²⁷, T. Wakisaka⁴², R. Wallny⁹, S. M. Wang¹, A. Warburton³⁴, D. Waters³¹, M. Weinberger⁵⁴, W. C. Wester, III¹⁸, B. Whitehouse⁵⁷, D. Whiteson^46,‡‡, A. B. Wicklund², E. Wicklund¹⁸, G. Williams³⁴, H. H. Williams⁴⁶, P. Wilson¹⁸, B. L. Winer⁴⁰, P. Wittich^18,b, S. Wolbers¹⁸, C. Wolfe¹⁴, T. Wright³⁵, X. Wu²¹, S. M. Wynne³⁰, A. Yagil¹⁰, K. Yamamoto⁴², J. Yamaoka⁵³, U. K. Yang^14,g, Y. C. Yang²⁸, W. M. Yao²⁹, G. P. Yeh¹⁸, J. Yoh¹⁸, K. Yorita¹⁴, T. Yoshida⁴², G. B. Yu⁵⁰, I. Yu²⁸, S. S. Yu¹⁸, J. C. Yun¹⁸, L. Zanello^52,r, A. Zanetti⁵⁵, I. Zaw²³, X. Zhang²⁵, Y. Zheng^9,**, and S. Zucchelli^6,p (CDF Collaboration)
¹Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
²Argonne National Laboratory, Argonne, Illinois 60439
³University of Athens, 157 71 Athens, Greece
⁴Institut de Fisica d’Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain
⁵Baylor University, Waco, Texas 76798
⁶Istituto Nazionale di Fisica Nucleare Bologna, University of Bologna, I-40127 Bologna, Italy
⁷Brandeis University, Waltham, Massachusetts 02254
⁸University of California, Davis, Davis, California 95616
⁹University of California, Los Angeles, Los Angeles, California 90024
¹⁰University of California, San Diego, La Jolla, California 92093
¹¹University of California, Santa Barbara, Santa Barbara, California 93106
¹²Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
¹³Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
¹⁴Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637
¹⁵Comenius University, 842 48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice, Slovakia
¹⁶Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
¹⁷Duke University, Durham, North Carolina 27708
¹⁸Fermi National Accelerator Laboratory, Batavia, Illinois 60510
¹⁹University of Florida, Gainesville, Florida 32611
²⁰Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
²¹University of Geneva, CH-1211 Geneva 4, Switzerland
²²Glasgow University, Glasgow G12 8QQ, United Kingdom
²³Harvard University, Cambridge, Massachusetts 02138
²⁴Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland
²⁵University of Illinois, Urbana, Illinois 61801
²⁶The Johns Hopkins University, Baltimore, Maryland 21218
²⁷Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
²⁸Center for High Energy Physics: Kyungpook National University, Daegu 702-701, Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan University, Suwon 440-746, Korea; Korea Institute of Science and Technology Information, Daejeon, 305-806, Korea; Chonnam National University, Gwangju, 500-757, Korea
²⁹Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720
³⁰University of Liverpool, Liverpool L69 7ZE, United Kingdom
³¹University College London, London WC1E 6BT, United Kingdom
³²Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, E-28040 Madrid, Spain
³³Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
³⁴Institute of Particle Physics: McGill University, Montréal, Canada H3A 2T8; and University of Toronto, Toronto, Canada M5S 1A7
³⁵University of Michigan, Ann Arbor, Michigan 48109
³⁶Michigan State University, East Lansing, Michigan 48824
³⁷Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia
³⁸University of New Mexico, Albuquerque, New Mexico 87131
³⁹Northwestern University, Evanston, Illinois 60208
⁴⁰The Ohio State University, Columbus, Ohio 43210
⁴¹Okayama University, Okayama 700-8530, Japan
⁴²Osaka City University, Osaka 588, Japan
⁴³University of Oxford, Oxford OX1 3RH, United Kingdom
⁴⁴Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, University of Padova, I-35131 Padova, Italy
⁴⁵LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, F-75252 France
⁴⁶University of Pennsylvania, Philadelphia, Pennsylvania 19104
⁴⁷Istituto Nazionale di Fisica Nucleare Pisa, University of Pisa, University of Siena and Scuola Normale Superiore, I-56127 Pisa, Italy
⁴⁸University of Pittsburgh, Pittsburgh, Pennsylvania 15260
⁴⁹Purdue University, West Lafayette, Indiana 47907
⁵⁰University of Rochester, Rochester, New York 14627
⁵¹The Rockefeller University, New York, New York 10021
⁵²Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, Sapienza Università di Roma, I-00185 Roma, Italy
⁵³Rutgers University, Piscataway, New Jersey 08855
⁵⁴Texas A&M University, College Station, Texas 77843
⁵⁵Istituto Nazionale di Fisica Nucleare Trieste/ Udine, University of Trieste/Udine, Italy
⁵⁶University of Tsukuba, Tsukuba, Ibaraki 305, Japan
⁵⁷Tufts University, Medford, Massachusetts 02155
⁵⁸Waseda University, Tokyo 169, Japan
⁵⁹Wayne State University, Detroit, Michigan 48201
⁶⁰University of Wisconsin, Madison, Wisconsin 53706
⁶¹Yale University, New Haven, Connecticut 06520

^*Deceased.

^†Deceased.

^‡With visitors from

^§Universiteit Antwerpen, B-2610 Antwerp, Belgium.

^**Chinese Academy of Sciences, Beijing 100864, China.

^††University of Bristol, Bristol BS8 1TL, United Kingdom.

^‡‡University of California Irvine, Irvine, CA 92697, USA.

^aUniversity of California Santa Cruz, Santa Cruz, CA 95064, USA.

^bCornell University, Ithaca, NY 14853, USA.

^cUniversity of Cyprus, Nicosia CY-1678, Cyprus.

^dUniversity College Dublin, Dublin 4, Ireland.

^eUniversity of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.

^fUniversidad Iberoamericana, Mexico D.F., Mexico.

^gUniversity of Manchester, Manchester M13 9PL, England.

^hNagasaki Institute of Applied Science, Nagasaki, Japan.

ⁱUniversity de Oviedo, E-33007 Oviedo, Spain.

^jQueen Mary, University of London, London, E1 4NS, England.

^kTexas Tech University, Lubbock, TX 79409, USA.

^lIFIC (CSIC-Universitat de Valencia), 46071 Valencia, Spain.

^mUniversity of Pisa, Superiore, I-56127 Pisa, Italy.

ⁿUniversity of Siena, Superiore, I-56127 Pisa, Italy.

^oScuola Normale, Superiore, I-56127 Pisa, Italy.

^pUniversity of Bologna, I-40127 Bologna, Italy.

^qUniversity of Padova, I-35131 Padova, Italy.

^rSapienza Università di Roma, I-00185 Roma, Italy.

^sUniversity of Trieste/Udine, Italy.

^tRoyal Society of Edinburgh/Scottish Executive Support Research Fellow.