نتایج جستجو برای: baryon

تعداد نتایج: 9715  

1998
Utpal Sarkar

During a large period of time, the anomalous baryon number violating interactions are in equilibrium, when the (B+L) asymmetry is washed out. If there is any lepton number violation during this period, that will also erase the (B −L) asymmetry. As a result, survival of the baryon asymmetry of the universe pose strong constraints on lepton number violating interactions. We review here the constr...

2001
A. Parreño A. Ramos

The strangeness-changing (∆S = 1) weak baryon-baryon interaction is studied through the nonmesonic weak decay of double-Λ hypernuclei. Besides the usual nucleon-induced decay ΛN → NN we discuss novel hyperon-induced decay modes ΛΛ → ΛN and ΛΛ → ΣN . These reactions provide unique access to the exotic ΛΛK and ΛΣK vertices which place new constraints on Chiral Pertubation Theory (χPT) in the weak...

2010
J. Martin Camalich

We present an analysis of the baryon-octet and -decuplet masses using covariant SU(3)-flavor chiral perturbation theory up to next-to-leading order. Besides the description of the physical masses we address the problem of the lattice QCD extrapolation. Using the PACS-CS collaboration data we show that a good description of the lattice points can be achieved at next-to-leading order with the cov...

Journal: :Physical review letters 2004
V Kubarovsky L Guo D P Weygand P Stoler M Battaglieri R DeVita G Adams Ji Li M Nozar C Salgado P Ambrozewicz E Anciant M Anghinolfi B Asavapibhop G Audit T Auger H Avakian H Bagdasaryan J P Ball S Barrow K Beard M Bektasoglu M Bellis N Benmouna B L Berman N Bianchi A S Biselli S Boiarinov S Bouchigny R Bradford D Branford W J Briscoe W K Brooks V D Burkert C Butuceanu J R Calarco D S Carman B Carnahan C Cetina S Chen L Ciciani P L Cole J Connelly D Cords P Corvisiero D Crabb H Crannell J P Cummings E De Sanctis P V Degtyarenko H Denizli L Dennis K V Dharmawardane C Djalali G E Dodge D Doughty P Dragovitsch M Dugger S Dytman O P Dzyubak H Egiyan K S Egiyan L Elouadrhiri A Empl P Eugenio L Farhi R Fatemi R J Feuerbach J Ficenec T A Forest V Frolov H Funsten S J Gaff M Garçon G Gavalian G P Gilfoyle K L Giovanetti P Girard R Gothe C I O Gordon K Griffioen M Guidal M Guillo V Gyurjyan C Hadjidakis R S Hakobyan D Hancock J Hardie D Heddle P Heimberg F W Hersman K Hicks M Holtrop J Hu Y Ilieva M M Ito D Jenkins K Joo H G Juengst J H Kelley M Khandaker K Y Kim K Kim W Kim F J Klein A V Klimenko M Klusman M Kossov L H Kramer S E Kuhn J Kuhn J Lachniet J M Laget J Langheinrich D Lawrence A Longhi K Lukashin R W Major J J Manak C Marchand S McAleer J W C McNabb B A Mecking S Mehrabyan J J Melone M D Mestayer C A Meyer K Mikhailov R Minehart M Mirazita R Miskimen V Mokeev L Morand S A Morrow M U Mozer V Muccifora J Mueller G S Mutchler J Napolitano R Nasseripour S O Nelson S Niccolai G Niculescu I Niculescu B B Niczyporuk R A Niyazov J T O'Brien G V O'Rielly A K Opper M Osipenko K Park E Pasyuk G Peterson S A Philips N Pivnyuk D Pocanic O Pogorelko E Polli S Pozdniakov B M Preedom J W Price Y Prok D Protopopescu L M Qin B A Raue G Riccardi M Ripani B G Ritchie F Ronchetti P Rossi D Rowntree P D Rubin F Sabatié K Sabourov J P Santoro V Sapunenko M Sargsyan R A Schumacher V S Serov A Shafi Y G Sharabian J Shaw S Simionatto A V Skabelin E S Smith T Smith L C Smith D I Sober M Spraker A Stavinsky S Stepanyan I I Strakovsky S Strauch M Taiuti S Taylor D J Tedeschi U Thoma R Thompson L Todor C Tur M Ungaro M F Vineyard A V Vlassov K Wang L B Weinstein A Weisberg C S Whisnant E Wolin M H Wood A Yegneswaran J Yun

The reaction gamma p-->pi(+)K(-)K(+)n was studied at Jefferson Laboratory using a tagged photon beam with an energy range of 3-5.47 GeV. A narrow baryon state with strangeness S=+1 and mass M=1555+/-10 MeV/c(2) was observed in the nK(+) invariant mass spectrum. The peak's width is consistent with the CLAS resolution (FWHM=26 MeV/c(2)), and its statistical significance is (7.8+/-1.0)sigma. A bar...

Journal: :Physical review. D, Particles and fields 1995
Lo

We reexamine the self-helicity and the intercommutation of electroweak strings. A plausible argument for baryon number conservation when electroweak strings intercommute is presented. The connection between a segment of electroweak string and a sphaleron is also discussed. ⋆ Address after Sep. 1: School of Natural Sciences, Institute for Advanced Study, Princeton, NJ 08540 One of the most basic...

2002
Takeshi Fukuyama Nobuchika Okada

We study the leptogenesis scenario in models with multi-Higgs doublets. It is pointed out that the washing-out process through the effective dimension five interactions, which has not been taken into account seriously in the conventional scenario, can be effective, and the resultant baryon asymmetry can be exponentially suppressed. This fact implies new possible scenario where the observed bary...

2004
Yasuyuki Suzuki Michio Kohno Kazuya Miyagawa

The quark-model baryon-baryon interaction fss2, proposed by the Kyoto-Niigata group, is a unified model for the complete baryon octet (B8 = N , Λ, Σ and Ξ), which is formulated in a framework of the (3q)-(3q) resonating-group method (RGM) using the spin-flavor SU6 quark-model wave functions and effective meson-exchange potentials at the quark level. Model parameters are determined to reproduce ...

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