Hector Gisbert
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View article: New algorithm to predict colorectal cancer based on fecal volatile organic compounds profile
New algorithm to predict colorectal cancer based on fecal volatile organic compounds profile Open
In this study, an algorithm designed for the analysis of fecal samples for colorectal cancer diagnostics, utilizing the data from the advanced technique of thermal-desorption-gas chromatography-mass spectrometry (TD-GC-MS), is constructed.…
View article: Searching for long-lived particles in free neutron experiments
Searching for long-lived particles in free neutron experiments Open
We explore the decay of free neutrons into exotic long-lived particles, whose decays could be detected in the next-generation free neutron experiments. We show that such a possibility is viable as long as the exotic particle is highly mass…
View article: Searching for Long-Lived Particles in Free Neutron Experiments
Searching for Long-Lived Particles in Free Neutron Experiments Open
We explore the decay of free neutrons into exotic long-lived particles, whose decays could be detected in the next-generation free neutron experiments. We show that such a possibility is viable as long as the exotic particle is highly mass…
View article: Axion window on new macroscopic forces
Axion window on new macroscopic forces Open
Axion-mediated forces are enhanced by the presence of CP-violating axion couplings, which are however tightly constrained by electric dipole moment (EDM) searches. We discuss the underlying hypotheses behind different sources of CP violati…
View article: Effective field theory analysis of rare |∆c| = |∆u| = 1 charm decays
Effective field theory analysis of rare |∆c| = |∆u| = 1 charm decays Open
A bstract We perform a global analysis of |∆ c | = |∆ u | = 1 transitions using recent data on D 0 → μ + μ − , D + → π + μ + μ − , Λ c → p μ + μ − , and D 0 → π + π − μ + μ − decays, and work out constraints on new physics Wilson coefficie…
View article: Old and new anomalies in charm
Old and new anomalies in charm Open
View article: Effective field theory analysis of rare $|Δc|=|Δu|=1$ charm decays
Effective field theory analysis of rare $|Δc|=|Δu|=1$ charm decays Open
We perform a global analysis of $|Δc| = |Δu| = 1$ transitions using recent data on $D^0 \to μ^+μ^-$, $D^+ \to π^+\,μ^+μ^-$, $Λ_c \to p\,μ^+μ^-$, and $D^0 \to π^+π^-\,μ^+μ^-$ decays, and work out constraints on new physics Wilson coefficien…
View article: Constraints on baryon-number-violating top-quark operators in standard model effective field theory
Constraints on baryon-number-violating top-quark operators in standard model effective field theory Open
Within the Standard Model Effective Field Theory framework, we set indirect constraints on top quark operators that violate baryon number by one unit above the TeV scale. We find that these constraints are typically many orders of magnitud…
View article: Axion Window on New Macroscopic Forces
Axion Window on New Macroscopic Forces Open
Axion-mediated forces are enhanced by the presence of CP-violating axion couplings, which are however tightly constrained by electric dipole moment (EDM) searches. We discuss the underlying hypotheses behind different sources of CP violati…
View article: On the oscillating electric dipole moment induced by axion-fermion couplings
On the oscillating electric dipole moment induced by axion-fermion couplings Open
A bstract It has been recently claimed that the axion coupling to fermions is responsible for an oscillating electric dipole moment (EDM) in the background of axion dark matter. In this work, we re-examine the derivation of this effect. Co…
View article: A complete update to epsilon' / epsilon in the Standard Model
A complete update to epsilon' / epsilon in the Standard Model Open
View article: Implications of an enhanced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>K</mml:mi><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math> branching ratio
Implications of an enhanced branching ratio Open
Rare decays mediated by b→sνν¯ transitions have been reported by the Belle II experiment. The branching ratio of the decay B+→K+νν¯ is found to be enhanced with respect to the standard model value. If taken at face value, the implications …
View article: CP-Violating Axions: A Theory Review
CP-Violating Axions: A Theory Review Open
We review the physics case for CP-violating axions. In the first part, we focus on the Quantum Chromodynamics (QCD) axion and argue that new sources of CP violation beyond QCD misalign the axion solution to the strong CP problem and can ma…
View article: Old and new anomalies in charm
Old and new anomalies in charm Open
The recent LHCb determination of the direct CP asymmetries in the decays $D^0 \to K^+ K^-, π^+ π^-$ hints at a sizeable breaking of two approximate symmetries of the SM: CP and U-spin. We aim at explaining the data with BSM physics and use…
View article: Implications of an enhanced $B \to K ν\bar ν$ branching ratio
Implications of an enhanced $B \to K ν\bar ν$ branching ratio Open
Rare decays mediated by $b \to s ν\bar ν$ transitions have been reported by the Belle II experiment. The branching ratio of the decay $B^+ \to K^+ ν\bar ν$ is found to be enhanced with respect to the standard model value. If taken at face …
View article: On the oscillating electric dipole moment induced by axion-fermion couplings
On the oscillating electric dipole moment induced by axion-fermion couplings Open
It has been recently claimed that the axion coupling to fermions is responsible for an oscillating electric dipole moment (EDM) in the background of axion dark matter. In this work, we re-examine the derivation of this effect. Contrary to …
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>U</mml:mi></mml:math>-spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> anomaly in charm
-spin- anomaly in charm Open
The recent measurement of the CP-asymmetry in the decay $D \to K^+ K^-$ by LHCb, combined with $\Delta A_{\text{CP}}$, evidences a sizable CP-asymmetry in $D \to \pi^+ \pi^-$ decays, which requires a dynamical enhancement of standard model…
View article: Model-independent analysis of $$\varvec{b \rightarrow d}$$ processes
Model-independent analysis of $$\varvec{b \rightarrow d}$$ processes Open
We perform a model-independent analysis of $$|\Delta b|=|\Delta d|=1$$ processes to test the standard model and probe flavor patterns of new physics. Constraints on Wilson coefficients are obtained from global fits to $$B^+ \r…
View article: Two is better than one: The U-spin-CP anomaly in charm
Two is better than one: The U-spin-CP anomaly in charm Open
The recent measurement of the CP-asymmetry in the decay $D \to K^+ K^-$ by LHCb, combined with $ΔA_{\text{CP}}$, evidences a sizable CP-asymmetry in $D \to π^+ π^-$ decays, which requires a dynamical enhancement of standard model higher-or…
View article: Model-independent analysis of $b\to d$ processes
Model-independent analysis of $b\to d$ processes Open
We perform a model-independent analysis of $|Δb|=|Δd|=1$ processes to test the standard model and probe flavor patterns of new physics. Constraints on Wilson coefficients are obtained from global fits to $B^+ \to π^+ \,μ^+μ^-$, $B^0_s\to \…
View article: Isospin-violating contributions to ϵ'/ϵ
Isospin-violating contributions to ϵ'/ϵ Open
The known isospin-breaking contributions to the K → ππ amplitudes are reanalyzed, taking into account our current understanding of the quark masses and the relevant non-perturbative inputs. We present a complete numerical reappraisal of th…
View article: The role of dineutrino modes in the search for new physics
The role of dineutrino modes in the search for new physics Open
Dineutrino modes offer promising searches for new physics. The potential aspects of these modes are reviewed in detail. Performing a proper combination of them, novel tests of the SM symmetries are derived. Different phenomenological appli…
View article: Global fit on coloured scalars including the last W-boson mass measurement
Global fit on coloured scalars including the last W-boson mass measurement Open
We consider a simple extension of the electroweak theory, incorporating one $SU(2)_L$ doublet of colour-octet scalars with Yukawa couplings satisfying the principle of minimal flavour violation. Using the HEPfit package, we perform a globa…
View article: W-boson mass and electric dipole moments from colour-octet scalars
W-boson mass and electric dipole moments from colour-octet scalars Open
New coloured scalars in the Manohar-Wise model give sizeable contributions to the Electric Dipole Moment (EDM) of the neutron through one-loop and two-loop diagrams, computed in Reference [1]. Contributions from neutral scalars cancel out …
View article: Electric dipole moments from colour-octet scalars
Electric dipole moments from colour-octet scalars Open
View article: Dineutrino modes probing lepton flavor violation
Dineutrino modes probing lepton flavor violation Open
$SU(2)_L$-invariance links charged dilepton $\bar q\,q^\prime\,\ell^+\,\ell^-$ and dineutrino $\bar q\, q^\prime\, \bar\nu\,\nu$ couplings. This connection can be established using the Standard Model Effective Field Theory framework, and a…
View article: Lepton universality and lepton flavor conservation tests with dineutrino modes
Lepton universality and lepton flavor conservation tests with dineutrino modes Open
View article: Interplay of dineutrino modes with semileptonic rare B-decays
Interplay of dineutrino modes with semileptonic rare B-decays Open
A bstract We present a systematic global analysis of dineutrino modes b → qν $$ \overline{\nu} $$ , q = d, s , and charged dilepton b → qℓ + ℓ − transitions. We derive improved or even entirely new limits on dineutrino branching ratios…
View article: Electric dipole moments from colour-octet scalars
Electric dipole moments from colour-octet scalars Open
We present the contributions to electric dipole moments (EDMs) induced by the Yukawa couplings of an additional electroweak doublet of colour-octet scalars. The full set of one-loop diagrams and the enhanced higher-order effects from Barr-…
View article: Dineutrino modes probing lepton flavor violation
Dineutrino modes probing lepton flavor violation Open
$SU(2)_L$-invariance links charged dilepton $\bar q\,q^\prime\,\ell^+\,\ell^-$ and dineutrino $\bar q\, q^\prime\, \barν\,ν$ couplings. This connection can be established using the Standard Model Effective Field Theory framework, and allow…