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1. Search for 3- and 4-body decays of the scalar top quark in pp- collisions at root s = 1.8 TeV

Author

N. I. Bojko, D. O'Neil, Andrew White, A. Goussiou, A. Baden, Andrei Nomerotski, G. C. Blazey, John Hobbs, J. N. Butler, P. D. Grannis, J. Barreto, M. Buehler, Alexander Belyaev, S. Chopra, Ariel Schwartzman, Melissa Ridel, R. Kehoe, R. Yamada, Patrick Slattery, A. Khanov, N. Parua, V.V. Abramov, M. Jaffré, M. Abolins, H. L. Melanson, Elemer Nagy, N. R. Stanton, L. Duflot, E. W. Anderson, Arnaud Lucotte, C. Luo, Mary Beth Adams, Alexander Kupco, W. Kahl, S. Youssef, J. M. Hauptman, Cecilia Elena Gerber, Ulrich Heintz, D. Edmunds, James C. Green, N. K. Mondal, R. K. Shivpuri, D. Cutts, H. T. Diehl, T. A. Bolton, N.V. Mokhov, Marvin Johnson, H. Jöstlein, Q. Z. Li, Andre Sznajder, D. R. Claes, Frank Filthaut, Randy Ruchti, V. Zutshi, Wagner Carvalho, N. Sotnikova, R. J. Genik, M. I. Martin, Yuri Gershtein, Greg Landsberg, D. Whiteson, A. Boehnlein, A. V. Kozelov, V. V. Babintsev, David H. Adams, M. Diesburg, G. Ginther, Alice Bean, S. Duensing, Wendy Taylor, A. Patwa, P. Krivkova, D. Hedin, Roger Moore, S. Doulas, Sebastian Grinstein, K. Soustruznik, Shuichi Kunori, A. P. Heinson, A. N. Galyaev, V. Vaniev, L. Babukhadia, D. Shpakov, J. Ellison, A. K.A. Maciel, Sa. Jain, S. Fuess, Jianming Qian, A. Abdesselam, V. A. Bezzubov, S. J. De Jong, A. V. Kostritskiy, Michael A. Strauss, Kaushik De, F. Canelli, Volker Buescher, Vladimir Gavrilov, J. P. Negret, P. Demine, R. P. Smith, Gordon Watts, V. Sirotenko, H. Zheng, T. Nunnemann, B. Baldin, D. Coppage, F. Borcherding, D. K. Cho, Y. Arnoud, G. Sajot, D. A. Stoyanova, A. S. Turcot, B. Kothari, Vipin Bhatnagar, K. Gounder, O. V. Eroshin, Y. Song, G. Briskin, M. Strovink, Michael Shupe, Sissel Hansen, Michael Hildreth, S. M. Tripathi, Y. Kulik, R. E. Hall, P. I. Goncharov, R. Illingworth, L. Lueking, R. Partridge, X. Zhang, W. E. Cooper, J. Estrada, A. Leflat, Jeffrey F. Krane, N. A. Naumann, L. Coney, Suman Bala Beri, S. Baffioni, W. M. Lee, A. Kharchilava, Christos Leonidopoulos, Sarah Catherine Eno, S. N. Ahmed, S. Reucroft, Y. A. Yatsunenko, D. Chakraborty, Stephen Wimpenny, Harrison Prosper, Michael Begel, T. Marshall, Sergey Kuleshov, Christophe Royon, C. Miao, B. Olivier, Victor Daniel Elvira, V. L. Malyshev, B. M. Sabirov, A. Juste, F. Nang, E. Popkov, Richard B. Lipton, J. Womersley, Arnaud Duperrin, Heriberto Castilla-Valdez, S. Desai, V. M. Abazov, H. D. Wahl, D. Bauer, H. S. Mao, D. Fein, B. Connolly, Richard Breedon, M. Zanabria, Winston Ko, Pushpalatha C Bhat, U. Bassler, Jong-Sung Yu, V. Simak, C. Han, Don Lincoln, P. W. Balm, P. Padley, S. Tentindo-Repond, D. Karmanov, Alexey Volkov, A. Stone, Daniel John Karmgard, T. Rockwell, Iain Alexander Bertram, Michael Rijssenbeek, C. Hebert, M. Merkin, D. A. Wijngaarden, T. Yasuda, Mitchell Wayne, H. Schellman, J. M. Kohli, Ia Iashvili, T. C. Bacon, D. Mihalcea, E. Kajfasz, K. Bos, Zeno Dixon Greenwood, Stefan Grünendahl, Alberto Santoro, Philip Baringer, Raymond Brock, V. N. Evdokimov, M. A.C. Cummings, Boaz Klima, Bobby Samir Acharya, H. A. Neal, Jing Li, S. Banerjee, Mossadek Talby, B. Gómez, R. Beuselinck, D. Casey, J. T. Linnemann, V. Sorín, P. M. Tuts, V. E. Kuznetsov, P. Rubinov, K. Yip, S. Krzywdzinski, J. Kotcher, Shashikant Dugad, Harald Fox, D. P. Stoker, B. G. Pope, S. Willis, L. Stutte, A.S. Dyshkant, B. Hoeneisen, Lee Sawyer, N. Graf, Y. D. Mutaf, Robert Hirosky, H. E. Fisk, A. Zylberstejn, F. Fleuret, Elizaveta Shabalina, A. M. Kalinin, F. Lehner, H. Greenlee, Z. Zhou, J. Solomon, R. Demina, A. Bross, O. Peters, G. A. Davis, Elizabeth Gallas, T. McMahon, Serban Protopopescu, G. Gutierrez, Gilvan Alves, V. S. Narasimham, L. Groer, A. A. Mayorov, J. Snow, M. Gao, J. T. Eltzroth, S.A. Kahn, R. Jesik, K. A. Johns, M. Demarteau, G. Bernardi, V. Oguri, Gustaaf Brooijmans, J. Warchol, P. Yamin, G. D. Alexeev, Flera Rizatdinova, P. A. Rapidis, A. Jonckheere, A. P. Vorobiev, Stephan Linn, M. Sosebee, N. Oshima, Daria Zieminska, R. D. Schamberger, M. A. Kubantsev, Freya Blekman, Andrew Brandt, R. Engelmann, E. A. Kozlovsky, H.E. Miettinen, E. G. Zverev, Meenakshi Narain, G. Eppley, H. da Motta, J. G.R. Lima, S. N. Gurzhiev, A. S. Ito, Viatcheslav Stolin, C. Lundstedt, Carlos Avila, Sabine Crépé-Renaudin, Neeti Parashar, R. L. McCarthy, M. Zielinski, Suyong Choi, D. Denisov, J. M. Heinmiller, Srinivasan Rajagopalan, Hal Evans, Thomas Ferbel, M. H.G. Souza, H. E. Montgomery, R. Van Kooten, A. Besson, P.F. Ermolov, A. Zieminski, V. S. Burtovoi, R. A. Sidwell, R. J. Madaras, D. Buchholz, Florian Beaudette, J. Huang, Gregory R Snow, G. Steinbrück, K. Genser, M. B. Przybycien, Rajendran Raja, Phillip Gutierrez, M. A. Strang, Emanuela Barberis, Vasken Hagopian, H. Weerts, Z. M. Wang, Brad Abbott, Lev Dudko, F. Villeneuve-Seguier, Tulika Bose, Pierre Petroff, H. Haggerty, M. Fortner, N. W. Reay, S. Fu, Q. Xu, Darien Wood, Nicholas John Hadley, S. Blessing, Scott Snyder, M. Bhattacharjee, T. G. Trippe, Howard Gordon, Yu-tin Huang, Nikos Varelas, Bing Zhou, Sharon Hagopian, K. Papageorgiou, S. P. Denisov, M. R. Krishnaswamy, R. Piegaia, A. R. Clark, A. Alton, Sergey Chekulaev, K. M. Chan, K. W. Merritt, J. F. Bartlett, V. Manankov, and D0 (Tevatron, IHEF, IOP, FNWI)

Subjects
Quark, Physics, Particle physics, Top quark, Nuclear and High Energy Physics, Muon, 010308 nuclear & particles physics, Scalar (mathematics), High Energy Physics::Phenomenology, 01 natural sciences, Lightest Supersymmetric Particle, Nuclear physics, 0103 physical sciences, Neutralino, High Energy Physics::Experiment, Fermilab, 010306 general physics, Minimal Supersymmetric Standard Model
Abstract

We have searched for the signature of 3- and 4-body decays of pair-produced scalar top quarks (stop) in the inclusive final state containing an electron, a muon, and significant missing transverse energy using a sample of p p events corresponding to 108.3 pb−1 of data collected with the DO detector at Fermilab. The search is done in the framework of the minimal supersymmetric standard model assuming that the neutralino ( χ 0 1 ) is the lightest supersymmetric particle and is stable. No evidence for a signal is found and we derive cross-section upper limits as a function of stop (t) and neutralino masses in different decay scenarios leading to the blν χ 0 1 final state.

Published
2004

2. Hard single diffraction in p̄p collisions at s=630 and 1800 GeV

Author

A. N. Galyaev, D. K. Cho, Y. Arnoud, M. Merkin, R. Illingworth, Raymond Brock, Boaz Klima, R. Beuselinck, S. Willis, W. E. Cooper, S. Duensing, G. Eppley, Arnaud Duperrin, M. A. Strang, S. J. De Jong, Jong-Sung Yu, C. S. Mishra, S. Fu, B. Kothari, N.V. Mokhov, H. da Motta, J. G.R. Lima, M. Sosebee, V. M. Abazov, M. I. Martin, K. W. Merritt, Elemer Nagy, Vasken Hagopian, L. Lueking, H. Weerts, W. Kahl, Andrew White, J. F. Bartlett, A. P. Heinson, V. Manankov, E. W. Anderson, Q. Xu, Lev Dudko, T. G. Trippe, A. S. Ito, P. Pétroff, E. Kajfasz, E. Popkov, R. E. Hall, B. Pawlik, Q. Z. Li, Sharon Hagopian, K. Papageorgiou, Wendy Taylor, T. Rockwell, Iain Alexander Bertram, N. Parua, A. Goussiou, Roger Moore, S. Fuess, Michael Rijssenbeek, D. Mihalcea, D. Casey, S. Krzywdzinski, Sebastian Grinstein, B. Olivier, Neeti Parashar, J. Kotcher, A. Patwa, Anurag Gupta, R. Van Kooten, Z. M. Wang, L. Babukhadia, Vladimir Gavrilov, R. Piegaia, V. Oguri, Gordon Watts, R. Snihur, P. M. Tuts, V. E. Kuznetsov, Harald Fox, A. Zylberstejn, Shuichi Kunori, N. Graf, R. W. Stephens, Robert Hirosky, A. V. Kostritskiy, V. Sirotenko, Andrew Brandt, A. Abdesselam, A. M. Kalinin, H. E. Fisk, L. J. Pan, Z. Zhou, J. Solomon, Vipin Bhatnagar, K. Gounder, A. Alton, Andrei Nomerotski, John Hobbs, F. Lehner, H. Greenlee, V. N. Evdokimov, Gustaaf Brooijmans, B. M. Sabirov, O. V. Eroshin, Y. Song, Phillip Gutierrez, A. Bross, Sissel Hansen, T. Nunnemann, B. Baldin, E. A. Kozlovsky, H.E. Miettinen, D. Edmunds, D. Bauer, V. Vaniev, Howard Gordon, K. C. Frame, Chris Hays, M. Zielinski, R. Partridge, X. Zhang, J. Barreto, A. Khanov, R. Demina, A. Zieminski, G. A. Davis, L. Coney, G. Gutierrez, V. A. Bezzubov, V.V. Abramov, N. Sen, R. Gilmartin, Serban Protopopescu, A. Besson, J. P. Negret, Y. Ducros, V. L. Malyshev, Gilvan Alves, Heriberto Castilla-Valdez, R. L. McCarthy, J. Warchol, Andre Sznajder, R. P. Smith, M. Gao, M. Bhattacharjee, H. S. Mao, S. P. Denisov, W. M. Lee, A. Kharchilava, B. G. Pope, P. Demine, V. S. Narasimham, L. Groer, Yuri Gershtein, J. M. Hauptman, Cecilia Elena Gerber, Arnaud Lucotte, Michael Shupe, Michael Hildreth, K. M. Chan, Dhiman Chakraborty, T. Fahland, H. Zheng, S. N. Gurzhiev, M. R. Krishnaswamy, D. Fein, V. Simak, Alexander Kupco, J. Estrada, Sergey Kuleshov, E. G. Zverev, V. V. Babintsev, D. Coppage, B. Abbott, G. Ginther, A. A. Mayorov, Don Lincoln, P. Padley, V. Zutshi, Alexey Volkov, Y. A. Yatsunenko, P. Krivkova, A. R. Clark, N. Sotnikova, Jianming Qian, P. W. Balm, A. Stone, Daniel John Karmgard, A. V. Kotwal, Harrison Prosper, M. Roco, R. J. Genik, Elizabeth Gallas, T. McMahon, Randy Ruchti, Mitchell Wayne, H. Schellman, J. M. Kohli, Victor Daniel Elvira, Sergey Chekulaev, J. Snow, C. Hebert, G. Briskin, H. L. Melanson, N. A. Naumann, Stefan Grünendahl, R. A. Sidwell, E. Flattum, Christophe Royon, Jeffrey F. Krane, Viatcheslav Stolin, N. I. Bojko, Mossadek Talby, B. Gómez, Ulrich Heintz, Marc M Baarmand, S. Reucroft, J. H. Christenson, Meenakshi Narain, D. O'Neil, S. Chopra, H. D. Wahl, Elizaveta Shabalina, Shashikant Dugad, C. Lundstedt, M. Strovink, David H. Adams, M. Zanabria, Winston Ko, Carlos Avila, Jing Li, Michael A. Strauss, Alice Bean, Sabine Crépé-Renaudin, H. Jöstlein, M. Jaffré, Ariel Schwartzman, E. Smith, U. Bassler, F. Blekman, Suyong Choi, O. Peters, F. Canelli, Volker Buescher, J. T. Eltzroth, Melissa Ridel, R. Kehoe, J. T. White, G. Steinbrück, J. N. Butler, P. D. Grannis, R. Jesik, Laurent Duflot, T. Yasuda, Frank Filthaut, D. Hedin, Rajendran Raja, K. A. Johns, Alberto Santoro, Seong Keun Kim, M. Diesburg, A. Leflat, S. Youssef, P. Rubinov, Gregorio Bernardi, Suman Bala Beri, D. Denisov, J. M. Heinmiller, Srinivasan Rajagopalan, D. Shpakov, A. Juste, Bobby Samir Acharya, H. A. Neal, S. Tentindo-Repond, Hal Evans, Thomas Ferbel, T. C. Bacon, J. T. Linnemann, V. Sorín, B. Connolly, K. Yip, Richard Breedon, D. P. Stoker, L. Stutte, A.S. Dyshkant, Alexander Belyaev, Philip Baringer, Patrick Slattery, D. A. Stoyanova, A. S. Turcot, S. Banerjee, Zeno Dixon Greenwood, D. A. Wijngaarden, Michael Begel, K. Bos, K. Genser, M. Buehler, M. Chung, R. D. Schamberger, Y. Fisyak, N. R. Stanton, Christos Leonidopoulos, J. Womersley, Marvin Johnson, M. Abolins, D. Karmanov, Z. Casilum, Ia Iashvili, A. V. Kozelov, N. K. Mondal, H. T. Diehl, T. A. Bolton, H. Singh, D. Whiteson, A. Boehnlein, J. Ellison, A. K.A. Maciel, Sa. Jain, P. I. Goncharov, C. Miao, Pushpalatha C Bhat, M. H.G. Souza, H. E. Montgomery, M. A.C. Cummings, B. Hoeneisen, D. Buchholz, Lee Sawyer, Gregory R Snow, P.F. Ermolov, B. Knuteson, V. S. Burtovoi, R. J. Madaras, Haiyan Wang, S.A. Kahn, M. Demarteau, F. Borcherding, S. Desai, G. Sajot, E. J. Ramberg, P. Yamin, G. D. Alexeev, Flera Rizatdinova, Miguel Mostafa, Sarah Catherine Eno, P. A. Rapidis, François Fleuret, F. Nang, A. Jonckheere, A. P. Vorobiev, Richard B. Lipton, F. Villeneuve-Seguier, Stephan Linn, A. Baden, N. Oshima, Daria Zieminska, G. C. Blazey, M. A. Kubantsev, Stephen Wimpenny, T. Marshall, R. Yamada, Darien Wood, Nicholas John Hadley, S. Blessing, Scott Snyder, R. K. Shivpuri, John Rutherfoord, D. R. Claes, C. Luo, Mary Beth Adams, S. Doulas, James C. Green, Kaushik De, Emanuela Barberis, D. Cutts, Wagner Carvalho, Greg Landsberg, L. T. Goss, Charles Leggett, Y. Kulik, M. Paterno, K. Soustruznik, Tulika Bose, H. Haggerty, F. Beaudette, M. B. Przybycien, S. M. Tripathi, R. Engelmann, S. N. Ahmed, M. Fortner, N. W. Reay, Y. D. Mutaf, Yu-tin Huang, Nikos Varelas, Bing Zhou, and L. S. Vertogradov

Subjects
Diffraction, Physics, Particle physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Detector, Empty set, HERA, Jet (particle physics), 01 natural sciences, Nuclear physics, Pomeron, 0103 physical sciences, Momentum loss, Rapidity, High Energy Physics::Experiment, 010306 general physics
Abstract

Using the D empty set detector, we have studied events produced in (p) over barp collisions that contain large forward regions with very little energy deposition ("rapidity gaps") and concurrent jet production at center-of-mass energies of roots = 630 and 1800 GeV. The fraction of events with forward or central jets associated with rapidity gaps is compared to predictions for hard diffraction. We also extract the momentum loss for scattered protons in such processes. (C) 2002 Elsevier Science B.V. All rights reserved.

Published
2002
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3. Matrix metalloproteinase-1 polymorphism in hepatocellular carcinoma patients with hepatitis C or B

Author

Abdel M Aoda, Gehan K El Saeed, Belal A Montaser, and Omnia S. N. Ahmed

Subjects
Hepatitis B virus, business.industry, Materials Science (miscellaneous), Hepatitis C virus, Hepatitis C, Hepatitis B, medicine.disease, medicine.disease_cause, Hepatocellular carcinoma, Genotype, medicine, Cancer research, Interstitial collagenase, Gene polymorphism, business
Abstract

Objective The aim of this work was to study the relations hip between matrix metalloproteinase-1 (MMP-1) −1607 1G/2G gene polymorphism and hepatocellular carcinoma (HCC) in patients infected with hepatitis B or C viruses. Background MMP-1, an interstitial collagenase, plays an important role in the breakdown of extracellular matrix. It has been demonstrated that the overexpression of this enzyme is associated with tumor initiation, invasion, and metastasis. The − 1607 single guanine (1G)-to-2G polymorphism (reference single-nucleotide polymorphism 1799750) in the MMP-1 promoter region creates an E26 (Ets)-binding site and results in transcriptional upregulation. Therefore, the MMP-1 polymorphism may influence an individual's susceptibility to the development of certain tumors such as HCC. Patients and methods This study was carried out on 100 participants; 40 of them were patients with HCC infected with hepatitis C virus, 20 of them were patients with HCC infected with hepatitis B virus, and the remaining 40 were age-matched and sex-matched healthy volunteers. All participants were subjected to full history taking, laboratory investigations including liver profile, α-fetoprotein, and prothrombin induced by vitamin K absence II, and determination of MMP-1 − 1607 1G/2G polymorphism by PCR–restriction fragment length polymorphism assay. Results The MMP-1 − 1607 genotype distribution among HCC patients was significantly different from that in healthy controls (P Conclusion The results suggest that the MMP-1 − 1607 1G/2G polymorphism is associated with an increased risk for HCC.

Published
2017
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4. Rectal cancer following abdomino-perineal pull-through for imperforate anus

Author

S N, Ahmed, M D, Evans, P, Bose, P, Drew, J, Beynon, and M, Davies

Subjects
Adult, Male, Time Factors, Rectal Neoplasms, Infant, Chemoradiotherapy, Adenocarcinoma, Neoadjuvant Therapy, Pelvic Exenteration, Anus, Imperforate, Urethra, Colostomy, Humans, Neoplasm Invasiveness
Published
2012

5. Selective amygdalohippocampectomy: surgical outcome in children versus adults

Author

A, Datta, D Barry, Sinclair, M, Wheatley, L, Jurasek, T, Snyder, D, Quigley, S N, Ahmed, and D, Gross

Subjects
Adult, Treatment Outcome, Adolescent, Epilepsy, Temporal Lobe, Humans, Middle Aged, Amygdala, Child, Hippocampus, Neurosurgical Procedures, Retrospective Studies
Abstract

The objective of the study was to review our experience with selective amygdalohippocampectomy (SAH) in children and adults with intractable temporal lobe epilepsy.A retrospective case series was used in the setting of a tertiary care hospital which provides epilepsy care to both children and adults. All patients underwent a selective amygdalohippocampectomy procedure and had at least one year of follow-up. Adults and children were divided into two groups and the data was compared between children and adults.Twenty three patients, 9 children and 14 adults were studied. Age of surgery varied from 6 to 58 years. Surgical outcome was variable between the two groups. Amongst the children, three patients (33%) were seizure-free (Engel Class I), two patients (22%) had rare seizures (Engel Class II), one patient (11%) had a worthwhile decrease in seizures (Engel class III) and three patients (32%) had refractory seizures that required re-operation with an anterior temporal lobectomy. This differed from the adults, who all had a good outcome. Ten patients (71%) were seizure-free (Engel Class I) and the remainder (29%) had rare seizures (Engel Class II).Selective amygdalohippocampectomy can lead to excellent seizure surgical outcome in adults with refractory temporal lobe epilepsy. However, preliminary results show less favorable results in children. The difference is probably related to the different pathology between the two groups. Anterior temporal lobe resection may prove to be a more successful operation than SAH in children with intractable temporal lobe epilepsy.

Published
2009

6. Hepatitis A virus infection control: an audit of practice in England and Wales prior to guidelines being published

Author

P V, Markov, S N, Ahmed, and N S, Crowcroft

Subjects
Hepatitis A Vaccines, Wales, England, Incidence, Communicable Disease Control, Humans, Immunoglobulins, Guidelines as Topic, Hepatitis A, Disease Notification, Disease Outbreaks
Abstract

This survey was conducted in September 2001 to audit the practice of Consultants in Communicable Disease Control (CsCDC) and to gain a systematic picture of pre-guideline approaches to the control of hepatitis A virus infection in England and Wales. An audit form was distributed to all CsCDC by email and responses were entered in a database and analysed. Response rate is estimated at 44%. CsCDC predominantly recommend vaccination for prevention. For 31% of the CsCDC, index cases were not reported within a week of the onset of illness. As a result, vaccine was often used sub-optimally. By contrast 95% of the CsCDC were informed of an index case within two weeks of onset of illness, in time for effective use of human normal immunoglobulin (HNIG). CsCDC were cautious in the use of HNIG for a number of reasons including concerns about variant Creutzfeldt-Jacob Disease (vCJD). A substantial proportion (between 5% and 28% for different age groups) of CsCDC did not recommend any active prevention among close family contacts of a case. Important ways to improve practice include facilitating use of HNIG and speeding up reporting by doctors and laboratories.

Published
2003

7. Effect of ?Dowco 275?, a New Organophosphorus Nematicide, on Potato Cyst Nematode

Author

A. G. Whitehead and S. N. Ahmed

Subjects
biology, Aldicarb, Heterodera, Plant Sciences, Potato cyst nematode, Plant Science, Horticulture, biology.organism_classification, Agronomy, chemistry.chemical_compound, chemistry, Loam, Genetics, Agronomy and Crop Science
Abstract

SUMMARY ‘Dowco 275’ (0,0-diethyl 0-(6-fluoro-2 pyridyl) phosphorothioate) at 2·5, 5 and 10 p.p.m. in pots of sandy loam controlled potato cyst nematode (Heterodera rostochiensis Woll.). At 5 p.p.m. the control was as effective as with aldicarb.

Published
1972
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8. Abuse of Ketamine

Author

S N Ahmed and L Petchkovsky

Subjects
Psychiatry and Mental health, business.industry, Anesthesia, medicine, Ketamine, business, medicine.drug
Published
1980
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