119,155 research outputs found
Semileptonic bs -> ds2*(2573) l(nu)over-barl transition in QCD
No full textAzizi, Kazem (Dogus Author)We analyze the semileptonic B-s -> D-s2*(2573) l (nu) over bar (l) transition, where l = tau, mu or e, within the standard model. We apply the QCD sum rule approach to calculate the transition form factors entering the low energy Hamiltonian defining this channel. The fit functions of the form factors are used to estimate the total decay widths and branching fractions in all lepton channels. The orders of the branching ratios indicate that this transition is accessible at LHCb in the near future
Semileptonic Lambda(b) -> Lambda(c)l(v)over-bar(l) transition in full QCD
No full textAzizi, Kazem (Dogus Author)The tree-level b -> cl (v) over bar (l) based hadronic transitions have been the focus of much attention since recording significant deviations of the experimental data, on the ratios of the branching fractions in tau and e - mu channels of the semileptonic B -> D transition, from the SM predictions by the BABAR Collaboration in 2012. It can be of great importance to look whether similar discrepancies take place in the semileptonic baryonic Lambda(b) -> Lambda(c)l (v) over bar (l) decay channel or not. In this accordance we estimate the decay width as well as the ratios of the branching fractions in tau and e - mu channels of this baryonic transition by calculating the form factors, entering the amplitude of this transition as the main inputs, in the framework of QCD sum rules in full theory. We compare the obtained results with the predictions of other theoretical studies. Our results may be compared with the corresponding future experimental data to look for possible deviations of data from the SM predictions
Transition form factors of P wave bottomonium chi(b0)(1P) into B-c meson
No full textAzizi, Kazem (Dogus Author) -- Conference full title: International Workshop on Quantum Chromodynamics: Theory and Experiment, QCD at WORK 2012; Lecce; Italy; 18 June 2012 through 21 June 2012.Taking into account the two-gluon condensate contributions, the transition form factors enrolled to the low energy effective Hamiltonian describing the semileptonic chi(b0) -> B(c)l (nu) over bar, (l = (e, mu, tau)) decay channel are calculated within three-point QCD sum rules
FCNC transition of Sigma(Q) to nucleon
No full textAzizi, Kazem (Dogus Author) -- Conference full title: 35th International Conference of High Energy Physics, (ICHEP) 2010; Paris; France; SISSA; 22 July 2010 throught 28 July 2010.The loop level flavor changing neutral current transitions of the Sigma(b) -> nl(+)l(-) and Sigma(c) -> p l(+)l(-) are investigated in full QCD and heavy quark effective theory in the light cone QCD sum rules approach. Using the most general form of the interpolating current for E-Q, Q = b or c, the transition form factors are calculated using two sets of input parameters entering the nucleon distribution amplitudes. The obtained results are used to estimate the decay rates of the corresponding transitions
Analysis of the semileptonic transition of heavy Xi(Q) baryon to Xi baryon in Light Cone QCD Sum Rules
No full textAzizi, Kazem (Dogus Author) -- Confrence full title: HS'13: the proceedings of the 7th Joint International Hadron Structure'13 Conference: Tatranská Štrba, High Tatra Mountains, Slovak Republic, 30 June-4 July 2013.This study presents the analysis of form factor calculations of semileptonic transitions of heavy baryons via light cone QCD sum rules. The work covers the semileptonic transitions of the Xi(b) and Xi(c) baryons. The form factors for the transitions Xi(b) -> Xi l(+)l(-) and Xi(c) -> Xi lv are obtained using their currents in the most general form. The obtained form factors are also used to calculate the decay widths and branching ratios of the considered transitions
Inter-phase mass transfer in turbulent liquid-liquid dispersions: A comparative analysis of models
No full textA comparative evaluation of eight models used to predict the dispersed phase mass transfer coefficient was undertaken using recent drop size and mass transfer data obtained under well known and controlled hydrodynamic conditions encountered in screen-type static mixers. A wide range of experimental conditions were covered (e[open]= 1.5-117. W-kg, φ= 0.1-0.47) thereby allowing for proper assessment of the strength and weaknesses of each model. All models failed to properly predict the experimental results over a wide range of design and operating conditions with the exception of those that contain a system-specific adjustable fitting parameter. Although these models yielded reasonably acceptable order-of-magnitude predictions, they could not accurately account for the variations in the different parameters investigated. This shows that proper understanding of the various factors affecting the dispersed phase mass transfer coefficient is still incomplete and highlights the need for phenomenological models that can account for the various physicochemical and hydrodynamic conditions on the dispersed-phase mass transfer coefficient. © 2011 Elsevier B.V.AlTaweel AM, 1996, CHEM ENG RES DES, V74, P445; Al Taweel A.M., 1984, 12 AUSTR CHEM ENG C, V1, P487; Al Taweel AM, 2007, CHEM ENG RES DES, V85, P760, DOI 10.1205-cherd06180; Alves SS, 2004, CHEM ENG PROCESS, V43, P823, DOI 10.1016-S0255-2701(03)00100-4; Andersson R, 2004, CHEM ENG SCI, V59, P4911, DOI 10.1016-j.ces.2004.07.084; Asghar D. Molaei, 2002, AICHE J, V48, P2230; Azizi F, 2011, CHEM ENG COMMUN, V198, P726, DOI 10.1080-00986445.2011.532748; Azizi F, 2011, CHEM ENG J, V166, P715, DOI 10.1016-j.cej.2010.11.050; Azizi F., 2005, RELIABLE DESIGN IND; Bart HJ, 2003, CHEM ENG TECHNOL, V26, P723, DOI 10.1002-ceat.200306102; Botello-Alvarez E.J., 2004, IND ENG CHEM RES, V43, P6527; Bouaifi M, 2001, CHEM ENG PROCESS, V40, P97, DOI 10.1016-S0255-2701(00)00129-X; BOURNE JR, 1991, CHEM ENG J BIOCH ENG, V47, P155, DOI 10.1016-0300-9467(91)85021-M; Briassulis G, 2001, J FLUID MECH, V432, P219; CAMURDAN MC, 1989, CAN J CHEM ENG, V67, P554; COULALOGLOU CA, 1977, CHEM ENG SCI, V32, P1289, DOI 10.1016-0009-2509(77)85023-9; Ebrahimi SSS, 2009, J CHEM ENG JPN, V42, P10; HANDLOS AE, 1957, AICHE J, V3, P127, DOI 10.1002-aic.690030121; Henschke M, 1999, AICHE J, V45, P2079, DOI 10.1002-aic.690451006; HSIA MA, 1980, CHEM ENG J BIOCH ENG, V20, P225, DOI 10.1016-0300-9467(80)80007-4; JOHNSON AI, 1960, AICHE J, V6, P145, DOI 10.1002-aic.690060128; Kang HS, 2003, J FLUID MECH, V480, P129, DOI 10.1007-S0022112002003579; KRONIG R, 1950, APPL SCI RES, V2, P142; Kumar A, 1999, CHEM ENG RES DES, V77, P372, DOI 10.1205-026387699526359; Laakkonen M, 2006, CHEM ENG SCI, V61, P218, DOI 10.1016-j.ces.2004.11.066; Maass S, 2012, CHEM ENG SCI, V70, P146, DOI 10.1016-j.ces.2011.08.027; Newman AB, 1931, T AM INST CHEM ENG, V27, P310; Noh H.S., 1984, AICHE J, V30, P120; Paul E. L., 2004, HDB IND MIXING SCI P; Rahbar A, 2011, CAN J CHEM ENG, V89, P508, DOI 10.1002-cjce.20448; RIBEIRO LM, 1995, COMPUT CHEM ENG, V19, P333, DOI 10.1016-0098-1354(94)00054-R; Schmidt SA, 2006, CHEM ENG SCI, V61, P246, DOI 10.1016-j.ces.2005.02.075; Skelland P.A.H., 1981, AICHE J, V27, P99; SLATER MJ, 1988, CHEM ENG SCI, V43, P233, DOI 10.1016-0009-2509(88)85036-X; SLATER MJ, 1995, CAN J CHEM ENG, V73, P462; STEINER L, 1986, CHEM ENG SCI, V41, P1979, DOI 10.1016-0009-2509(86)87114-7; Vasquez V., 1997, MINER PROCESS EXTR M, V17, P239, DOI 10.1080-08827509708914150; Venneker BCH, 2002, AICHE J, V48, P673, DOI 10.1002-aic.690480404; Yadav RL, 2008, CHEM ENG J, V138, P389, DOI 10.1016-j.cej.2007.06.015; YOUNG CH, 1989, CHEM ENG SCI, V44, P2355, DOI 10.1016-0009-2509(89)85168-122
Rare Decays of Heavy Baryons using Soft Collinear Effective Theory
No full textIn the era of high-luminosity hadronic colliders, the rare heavy-to-light decay Lambda_b to Lambda l+ l- receives increasing research attention in both experimental and theoretical particle phenomenology. This flavour-changing neutral-current decay is a potential window for the discovery of new Physics beyond the Standard Model through its helicity-sensitive nature, complementing past and ongoing searches and calculations related to the B meson.
In this work the universal soft form factor in the heavy-quark and large-recoil limits is calculated using light-cone sum rules in the framework of soft-collinear effective theory, as is the O(alpha_s) correction from hard-collinear gluon exchange.
Numerical estimates on form-factor ratios and experimental observables are presented. Related issues, including baryonic transition form factors and in particular light-cone distribution amplitudes for the heavy baryon Lambda_b, are also discussed
The strong decays of the light scalar mesons f0(500) and f0(980)
No full textAzizi, Kazem (Dogus Author)The partial width of the decay channels f0(500)→ππ f0(980)→ππ and f0(980)→KK¯ are calculated using QCD light-cone sum rules method and a technique of the soft meson approximation. The scalar particles are treated as mixtures of the heavy |H〉=([su][s¯u¯]+[sd][s¯d¯])/2 and light |L〉=[ud][u¯d¯] scalar diquark–antidiquark components. Obtained results for the full width of the f0(500) meson Γth.=434.7±72.3MeV and for the f0(980) meson Γth.=42.12±6.70MeV are compared with the world averages for these parameters, and a reasonable agreement between them is found
Probing an axial-vector tetraquark Z(s) via its semileptonic decay Z(s) -> X(4274)(I)over-bar nu(I)
No full textAzizi, Kazem (Dogus Author)The semileptonic decays of the open charm-bottom axial-vector tetraquark Z(s) = [cs][(b) over bar(s) over bar] to X(4274) (l) over bar nu(l) = e, mu, tau are explored by means of the QCD three-point sum rule method. Both Z(s) and X(4274) = [cs][(cs) over bar] are treated as color sextet diquark-antidiquark states. The full width of the decays Z(s) -> X(4274) (l) over bar nu(l) is found. Obtained predictions for Gamma(Z(s) -> X(4274)(l) over bar nu(l)) demonstrate that, as in the case of the conventional hadrons, the semileptonic transitions form a very small part of its full width
The structure, mixing angle, mass and couplings of the light scalar f(0)(500) and f(0)(980) mesons
No full textAzizi, Kazem (Dogus Author)The mixing angle, mass and couplings of the light scalar mesons f(0)(500) and f(0)(980) are calculated in the framework of QCD two-point sum rule approach by assuming that they are tetraquarks with diquark-antidiquark structures. The mesons are treated as mixtures of the heavy vertical bar H > = ([su][(s) over bar(u) over bar] + [sd][(s) over bar(d) over bar])/root 2 and light vertical bar L > = [ud][(u) over bar(d) over bar] scalar diquark-antidiquark components. We extract from corresponding sum rules the mixing angles phi(H) and phi(L) of these states and evaluate the masses and couplings of the particles f(0)(500) and f(0)(980)
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