نتایج جستجو برای: quark decay

تعداد نتایج: 99408  

2004
W. PLESSAS

We discuss strong decays of baryon resonances within the concept of relativistic constituent quark models. In particular, we follow a Poincaré-invariant approach along the point form of relativistic quantum mechanics. Here, we focus on pionic decay modes of N and ∆ resonances. It is found that the covariant quark-model predictions calculated in the point-form spectator model in general underest...

2008
R. Bonciani

We present an analytic expression for the two-loop QCD corrections to the decay process b → uW , where b and u are a massive and massless quark, respectively, while W ∗ is an off-shell charged weak boson. Since the W -boson can subsequently decay in a lepton anti-neutrino pair, the results of this paper are a first step towards a fully analytic computation of differential distributions for the ...

2002
V. E. Lyubovitskij

Exclusive rare decays of B and B c mesons in a relativistic quark model Abstract. In these lectures we give, first, the model-independent analysis of the exclusive rare decays B → K ¯ ll and Bc → D(D *) ¯ ll with special emphasis on the cascade decay Bc → D * (→ Dπ) ¯ ll. We derive a four-fold angular decay distribution for this process in terms of helicity amplitudes including lepton mass effe...

2005
G. Corcella

I review recent progress on bottom-quark fragmentation in e + e − annihilation, top-quark decay and H → b ¯ b processes. I discuss the implementation of collinear and soft resummation, and the inclusion of non-perturbative information taken from LEP and SLD data. Heavy-quark physics is currently one of the major fields of investigation in experimental and theoretical particle physics. In order ...

2004
J. Barr

Using lepton charge asymmetry to investigate the spin of supersymmetric particles at the LHC. Abstract If signals suggesting supersymmetry (SUSY) are discovered at the LHC then it will be vital to measure the spin of the new particles to demonstrate that they are indeed the predicted super-partners. A method is discussed by which the spins of some of the SUSY particles can be investigated. Angu...

1995
P. Colangelo F. De Fazio G. Nardulli

We propose a method to determine the leptonic decay constant fB∗ in the infinite heavy quark mass limit from the analysis of the radiative decay mode B− → lν̄lγ. The method relies on HQET symmetries and on experimental data from D∗0 → Dγ. E-mail address: [email protected] The measurement of fB and fB∗ , the leptonic decay constants of the B and B ∗ mesons, defined by the matrix elements: < ...

2006
A. C. KRAAN

The top quark with its mass of about 172 GeV/c is the most massive fundamental particle observed by experiment. In this talk we highlight the most recent measurements of several top quark properties performed with the CDF detector based on data samples corresponding to integrated luminosities up to 1 fb. These results include a search for top quark pair production via new massive resonances, me...

Journal: :Physical review letters 2009
V M Abazov B Abbott M Abolins B S Acharya M Adams T Adams E Aguilo M Ahsan G D Alexeev G Alkhazov A Alton G Alverson G A Alves M Anastasoaie L S Ancu T Andeen B Andrieu M S Anzelc M Aoki Y Arnoud M Arov M Arthaud A Askew B Asman A C S Assis Jesus O Atramentov C Avila J Backusmayes F Badaud L Bagby B Baldin D V Bandurin P Banerjee S Banerjee E Barberis A-F Barfuss P Bargassa P Baringer J Barreto J F Bartlett U Bassler D Bauer S Beale A Bean M Begalli M Begel C Belanger-Champagne L Bellantoni A Bellavance J A Benitez S B Beri G Bernardi R Bernhard I Bertram M Besançon R Beuselinck V A Bezzubov P C Bhat V Bhatnagar G Blazey F Blekman S Blessing K Bloom A Boehnlein D Boline T A Bolton E E Boos G Borissov T Bose A Brandt R Brock G Brooijmans A Bross D Brown X B Bu N J Buchanan D Buchholz M Buehler V Buescher V Bunichev S Burdin T H Burnett C P Buszello P Calfayan B Calpas S Calvet J Cammin M A Carrasco-Lizarraga E Carrera W Carvalho B C K Casey H Castilla-Valdez S Chakrabarti D Chakraborty K M Chan A Chandra E Cheu D K Cho S Choi B Choudhary L Christofek T Christoudias S Cihangir D Claes J Clutter M Cooke W E Cooper M Corcoran F Couderc M-C Cousinou S Crépé-Renaudin V Cuplov D Cutts M Cwiok H da Motta A Das G Davies K De S J de Jong E De La Cruz-Burelo C De Oliveira Martins K DeVaughan F Déliot M Demarteau R Demina D Denisov S P Denisov S Desai H T Diehl M Diesburg A Dominguez T Dorland A Dubey L V Dudko L Duflot S R Dugad D Duggan A Duperrin S Dutt J Dyer A Dyshkant M Eads D Edmunds J Ellison V D Elvira Y Enari S Eno P Ermolov M Escalier H Evans A Evdokimov V N Evdokimov A V Ferapontov T Ferbel F Fiedler F Filthaut W Fisher H E Fisk M Fortner H Fox S Fu S Fuess T Gadfort C F Galea C Garcia A Garcia-Bellido V Gavrilov P Gay W Geist W Geng C E Gerber Y Gershtein D Gillberg G Ginther B Gómez A Goussiou P D Grannis H Greenlee Z D Greenwood E M Gregores G Grenier Ph Gris J-F Grivaz A Grohsjean S Grünendahl M W Grünewald F Guo J Guo G Gutierrez P Gutierrez A Haas N J Hadley P Haefner S Hagopian J Haley I Hall R E Hall L Han K Harder A Harel J M Hauptman J Hays T Hebbeker D Hedin J G Hegeman A P Heinson U Heintz C Hensel K Herner G Hesketh M D Hildreth R Hirosky T Hoang J D Hobbs B Hoeneisen M Hohlfeld S Hossain P Houben Y Hu Z Hubacek N Huske V Hynek I Iashvili R Illingworth A S Ito S Jabeen M Jaffré S Jain K Jakobs C Jarvis R Jesik K Johns C Johnson M Johnson D Johnston A Jonckheere P Jonsson A Juste E Kajfasz D Karmanov P A Kasper I Katsanos V Kaushik R Kehoe S Kermiche N Khalatyan A Khanov A Kharchilava Y N Kharzheev D Khatidze T J Kim M H Kirby M Kirsch B Klima J M Kohli J-P Konrath A V Kozelov J Kraus T Kuhl A Kumar A Kupco T Kurca V A Kuzmin J Kvita F Lacroix D Lam S Lammers G Landsberg P Lebrun W M Lee A Leflat J Lellouch J Li L Li Q Z Li S M Lietti J K Lim J G R Lima D Lincoln J Linnemann V V Lipaev R Lipton Y Liu Z Liu A Lobodenko M Lokajicek P Love H J Lubatti R Luna-Garcia A L Lyon A K A Maciel D Mackin R J Madaras P Mättig A Magerkurth P K Mal H B Malbouisson S Malik V L Malyshev Y Maravin B Martin R McCarthy M M Meijer A Melnitchouk L Mendoza P G Mercadante M Merkin K W Merritt A Meyer J Meyer J Mitrevski R K Mommsen N K Mondal R W Moore T Moulik G S Muanza M Mulhearn O Mundal L Mundim E Nagy M Naimuddin M Narain H A Neal J P Negret P Neustroev H Nilsen H Nogima S F Novaes T Nunnemann D C O'Neil G Obrant C Ochando D Onoprienko N Oshima N Osman J Osta R Otec G J Otero y Garzón M Owen M Padilla P Padley M Pangilinan N Parashar S-J Park S K Park J Parsons R Partridge N Parua A Patwa G Pawloski B Penning M Perfilov K Peters Y Peters P Pétroff M Petteni R Piegaia J Piper M-A Pleier P L M Podesta-Lerma V M Podstavkov Y Pogorelov M-E Pol P Polozov B G Pope A V Popov C Potter W L Prado da Silva H B Prosper S Protopopescu J Qian A Quadt B Quinn A Rakitine M S Rangel K Ranjan P N Ratoff P Renkel P Rich M Rijssenbeek I Ripp-Baudot F Rizatdinova S Robinson R F Rodrigues M Rominsky C Royon P Rubinov R Ruchti G Safronov G Sajot A Sánchez-Hernández M P Sanders B Sanghi G Savage L Sawyer T Scanlon D Schaile R D Schamberger Y Scheglov H Schellman T Schliephake S Schlobohm C Schwanenberger R Schwienhorst J Sekaric H Severini E Shabalina M Shamim V Shary A A Shchukin R K Shivpuri V Siccardi V Simak V Sirotenko P Skubic P Slattery D Smirnov G R Snow J Snow S Snyder S Söldner-Rembold L Sonnenschein A Sopczak M Sosebee K Soustruznik B Spurlock J Stark V Stolin D A Stoyanova J Strandberg S Strandberg M A Strang E Strauss M Strauss R Ströhmer D Strom L Stutte S Sumowidagdo P Svoisky A Sznajder A Tanasijczuk W Taylor B Tiller F Tissandier M Titov V V Tokmenin I Torchiani D Tsybychev B Tuchming C Tully P M Tuts R Unalan L Uvarov S Uvarov S Uzunyan B Vachon P J van den Berg R Van Kooten W M van Leeuwen N Varelas E W Varnes I A Vasilyev P Verdier L S Vertogradov M Verzocchi D Vilanova F Villeneuve-Seguier P Vint P Vokac M Voutilainen R Wagner H D Wahl M H L S Wang J Warchol G Watts M Wayne G Weber M Weber L Welty-Rieger A Wenger N Wermes M Wetstein A White D Wicke M R J Williams G W Wilson S J Wimpenny M Wobisch D R Wood T R Wyatt Y Xie C Xu S Yacoob R Yamada W-C Yang T Yasuda Y A Yatsunenko Z Ye H Yin K Yip

Anomalous Wtb couplings modify the angular correlations of the top-quark decay products and change the single top-quark production cross section. We present limits on anomalous top-quark couplings by combining information from W boson helicity measurements in top-quark decays and anomalous coupling searches in the single top-quark final state. We set limits on right-handed vector couplings as w...

1995
Takashi Inoue Sachiko Takeuchi Makoto Oka

The weak ΛN → NN transition is studied in the valence quark model approach. The quark component of the two baryon system is described in the quark cluster model and the weak transition potential is calculated by evaluating the matrix elements of the ∆S = 1 effective weak Hamiltonian. The transition potential is applied to the decay of hypernuclei and the results are compared with available expe...

Journal: :Physical review. D, Particles and fields 1995
Scora Isgur

We present the predictions of ISGW2, an update of the ISGW quark model for semileptonic meson decays. The updated model incorporates a number of features which should make it more reliable, including the constraints imposed by Heavy Quark Symmetry, hyperfine distortions of wave-functions, and form factors with more realistic high recoil behaviors. It has been nearly ten years since the ISGW mod...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید