CHARM AND BEAUTY IN SUM RULES FROM SIMPLE MODELS

1998 ◽  
Vol 13 (13) ◽  
pp. 1035-1039
Author(s):  
JISHNU DEY ◽  
B. C. SAMANTA

There is information (and more will be known) about baryons containing one charm and beauty quark. A simple model of the charm and beauty baryons is found to give results which support the recent findings of other models including the 1/MQ expansion of QCD, where MQ is the heavy quark mass. Sum rules are found from the simple model which can be tested in the near future.

2011 ◽  
Author(s):  
Wolfgang Lucha ◽  
Dmitri Melikhov ◽  
Silvano Simula

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
M. V. Garzelli ◽  
L. Kemmler ◽  
S. Moch ◽  
O. Zenaiev

Abstract We present predictions for heavy-quark production at the Large Hadron Collider making use of the $$ \overline{\mathrm{MS}} $$ MS ¯ and MSR renormalization schemes for the heavy-quark mass as alternatives to the widely used on-shell renormalization scheme. We compute single and double differential distributions including QCD corrections at next-to-leading order and investigate the renormalization and factorization scale dependence as well as the perturbative convergence in these mass renormalization schemes. The implementation is based on publicly available programs, MCFM and xFitter, extending their capabilities. Our results are applied to extract the top-quark mass using measurements of the total and differential $$ t\overline{t} $$ t t ¯ production cross-sections and to investigate constraints on parton distribution functions, especially on the gluon distribution at low x values, from available LHC data on heavy-flavor hadro-production.


2012 ◽  
Author(s):  
Hana Saito ◽  
Sinya Aoki ◽  
K. Kanaya ◽  
Hiroshi Ohno ◽  
S. Ejiri ◽  
...  

2007 ◽  
Author(s):  
Wu-Ki Tung ◽  
Hung-Liang Lai ◽  
Jonathan Pumplin ◽  
Pavel Nadolsky

2014 ◽  
Vol 26 ◽  
pp. 1460107
Author(s):  
C. ALBERTUS ◽  
E. HERNÁNDEZ ◽  
J. NIEVES

We show that semileptonic and electromagnetic decays involving spin-1/2 doubly heavy bc baryons are very sensitive to hyperfine mixing in their wave functions. We further show how heavy quark spin symmetry relations, obtained in the infinite heavy quark mass limit and near zero recoil, could be used to extract the admixtures in a model independent way from semileptonic decay data. On the other hand the infinite heavy quark mass limit gives wrong predictions in the electromagnetic case.


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