English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Measurements of the $\Lambda_b \to p \ell^- \bar{\nu}_\ell$ and $\Lambda_b\to \Lambda_c \ell^- \bar{\nu}_\ell$ decay rates can be used to determine themagnitudes of the CKM matrix elements $V_{ub}$ and $V_{cb}$, provided that therelevant hadronic form factors are known. Here we present a precise calculationof these form factors using lattice QCD with 2+1 flavors of dynamicaldomain-wall fermions. The $b$ and $c$ quarks are implemented with relativisticheavy-quark actions, allowing us to work directly at the physical heavy-quarkmasses. The lattice computation is performed for six different pion masses andtwo different lattice spacings, using gauge-field configurations generated bythe RBC and UKQCD collaborations. The $b \to u$ and $b \to c$ currents arerenormalized with a mostly nonperturbative method. We extrapolate the formfactor results to the physical pion mass and the continuum limit, parametrizingthe $q^2$-dependence using $z$-expansions. The form factors are presented insuch a way as to enable the correlated propagation of both statistical andsystematic uncertainties into derived quantities such as differential decayrates and asymmetries. Using these form factors, we present predictions for the$\Lambda_b \to p \ell^- \bar{\nu}_\ell$ and $\Lambda_b \to \Lambda_c \ell^-\bar{\nu}_\ell$ differential and integrated decay rates. Combined withexperimental data, our results enable determinations of $|V_{ub}|$, $|V_{cb}|$,and $|V_{ub}/V_{cb}|$ with theory uncertainties of 4.4%, 2.2%, and 4.9%,respectively.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

$\Lambda_b \to p \ell^- \bar{\nu}_\ell$ and $\Lambda_b \to \Lambda_c  \ell^- \bar{\nu}_\ell$ form factors from lattice QCD with relativistic heavy  quarks