scholarly journals HEAVY QUARK SYMMETRIES: MOLECULAR PARTNERS OF THE X(3872) AND $Z_{b}(10610)/Z_{b}'(10650)$

2014 ◽  
Vol 26 ◽  
pp. 1460073 ◽  
Author(s):  
FENG-KUN GUO ◽  
CARLOS HIDALGO-DUQUE ◽  
JUAN NIEVES ◽  
MANUEL PAVÓN VALDERRAMA
Keyword(s):  
Field Theory ◽  
Experimental Data ◽  
Heavy Quark ◽  
Effective Field Theory ◽  
Heavy Baryon ◽  
Heavy Meson ◽  
Effective Field ◽  
Quark Spin

In this work, we have used an Effective Field Theory (EFT) framework based on Heavy Quark Spin (HQSS), Heavy Flavour (HFS) and Heavy Antiquark-Diquark symmetries (HADS). Using a standard lagrangian for the heavy meson-heavy antimeson system, we fit the counter-terms of the model to predict some promising experimental data that can be interpreted as heavy meson-heavy antimeson molecules, that is, the X(3872) and the [Formula: see text]. Next, and, taking advantage of HADS, we use the same lagrangian to explore the consequences for heavy meson-doubly heavy baryon molecules, which can also be interpreted as triply heavy pentaquarks.

scholarly journals A MORE PRECISE EXTRACTION OF |Vcb| IN HQEFT OF QCD

2004 ◽  
Vol 19 (18) ◽  
pp. 1379-1390 ◽  
Author(s):  
W. Y. WANG ◽  
Y. L. WU ◽  
Y. A. YAN ◽  
M. ZHONG ◽  
Y. B. ZUO
Keyword(s):  
Field Theory ◽  
Experimental Data ◽  
Matrix Element ◽  
Heavy Quark ◽  
Effective Field Theory ◽  
Effective Field ◽  
Decay Rates ◽  
Recent Experimental Data ◽  
B Decays ◽  
Ckm Matrix

The more precise extraction for the CKM matrix element |Vcb| in the heavy quark effective field theory (HQEFT) of QCD is studied from both exclusive and inclusive semileptonic B decays. The values of relevant nonperturbative parameters up to order [Formula: see text] are estimated consistently in HQEFT of QCD. Using the most recent experimental data for B decay rates, |Vcb| is updated to be |Vcb|=0.0395±0.0011expt±0.0019theorfrom B→D*lν decay and |Vcb|=0.0434±0.0041expt±0.0020theorfrom B→Dlν decay as well as |Vcb|=0.0394±0.0010expt±0.0014theorfrom inclusive B→Xclν decay.

scholarly journals |Vub| AND |Vcb|, CHARM COUNTING AND LIFETIME DIFFERENCES IN INCLUSIVE BOTTOM HADRON DECAYS

2001 ◽  
Vol 16 (02) ◽  
pp. 285-302
Author(s):  
Y. L. WU ◽  
Y. A. YAN
Keyword(s):  
Field Theory ◽  
Experimental Data ◽  
Heavy Quark ◽  
Effective Field Theory ◽  
Effective Field ◽  
Branch Ratio ◽  
Matrix Elements ◽  
Present Experimental Data ◽  
Mixing Matrix ◽  
Inclusive Semileptonic Decays

Inclusive bottom hadron decays are analyzed based on the heavy quark effective field theory (HQEFT). Special attentions in this paper are paid to the b→u transitions and nonspectator effects. As a consequence, the CKM quark mixing matrix elements |Vub| and |Vcb| are reliably extracted from the inclusive semileptonic decays B→Xueν and B→Xceν. Various observables, such as the semileptonic branch ratio BSL, the lifetime differences among B-, B0, Bsand Λbhadrons, the charm counting nc, are predicted and found to be consistent with the present experimental data.

scholarly journals INCLUSIVE DECAYS OF BOTTOM HADRONS IN NEW FORMULATION OF HEAVY QUARK EFFECTIVE FIELD THEORY

2000 ◽  
Vol 15 (17) ◽  
pp. 2735-2770
Author(s):  
Y. A. YAN ◽  
Y. L. WU ◽  
W. Y. WANG
Keyword(s):  
Field Theory ◽  
Experimental Data ◽  
Heavy Quark ◽  
Effective Field Theory ◽  
Semileptonic Decay ◽  
Effective Field ◽  
Decay Rates ◽  
Β Decay ◽  
Inclusive Decays ◽  
New Formulation

We apply the new formulation of heavy quark effective field theory (HQEFT) to the inclusive decays of bottom hadrons. The long-term ambiguity of using heavy quark mass or heavy hadron mass for inclusive decays is clarified within the framework of the new formulation of HQEFT. The 1/mborder corrections are absent and contributions from [Formula: see text] terms are calculated in detail. This enables us to reliably extract the important CKM matrix element |Vcb| from the inclusive semileptonic decay rates. The resulting lifetime ratios [Formula: see text] and τ(Λb)/τ(B0) are found to well agree with the experimental data. We also calculate in detail the inclusive semileptonic branching ratios and the ratios of the τ and β decay rates as well as the charm countings in the B0, [Formula: see text] and Λbsystems. For B0decays, all the observables are found to be consistent with the experimental data. More precise data for the B0decays and further experimental measurements for the [Formula: see text] and Λbsystems will be very useful for testing the framework of new formulation of HQEFT at the level of higher order corrections.

scholarly journals Effective Field Theory approach to heavy quark fragmentation

2016 ◽  
Vol 2016 (11) ◽  
Author(s):  
Michael Fickinger ◽  
Sean Fleming ◽  
Chul Kim ◽  
Emanuele Mereghetti
Keyword(s):  
Field Theory ◽  
Heavy Quark ◽  
Effective Field Theory ◽  
Effective Field ◽  
Theory Approach ◽  
Quark Fragmentation

scholarly journals Unimagined imaginary parts in heavy quark effective field theory

1993 ◽  
Vol 304 (3-4) ◽  
pp. 311-317 ◽  
Author(s):  
Wolfgang Kilian ◽  
Thomas Mannel ◽  
Thorsten Ohl
Keyword(s):  
Field Theory ◽  
Heavy Quark ◽  
Effective Field Theory ◽  
Effective Field
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