Clara Murgui
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Clara Murgui has a total of 11 co-authors. Here are the top co-authors by number of shared publications:
- Pavel Fileviez Pérez
Case Western Reserve University
12 shared publications - Alexis D. Plascencia
INFN, Laboratori Nazionali di Frascati, C.P. 13, 100044 Frascati, Italy
8 shared publications - Antonio Pich
University of Valencia
2 shared publications - Axel Gross
Physics Department and Center for Education and Research in Cosmology and Astrophysics (CERCA), Case Western Reserve University, Rockefeller Bldg. 2076 Adelbert Rd., Cleveland, Ohio 44106, USA
2 shared publications - Elliot Golias
Physics Department and Center for Education and Research in Cosmology and Astrophysics (CERCA), Case Western Reserve University, Cleveland, USA
2 shared publications - Elliot Golias
Physics Department and Center for Education and Research in Cosmology and Astrophysics (CERCA) Case Western Reserve University 44106 Cleveland OH USA
2 shared publications
Latest Publications
- Open Access
- 5 August 2020
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2020 (8) , 1-46
The role of right-handed neutrinos in $ b\to c\tau \overline{v} $ anomaliesMotivated by the persistent anomalies reported in the $$ b\to c\tau \overline{v} $$ data, we perform a general model-independent analysis of these transitions, in the presence of light right-handed neutrinos. We adopt an effective field theory approach and write a low-energy effective Hamiltonian, including all possible dimension-six operators. The corresponding Wilson coefficients are determined through a numerical fit to all available experimental data. In order to work with a manageable set of free parameters, we define eleven well- motivated scenarios, characterized by the different types of new physics that could mediate these transitions, and analyse which options seem to be preferred by the current measurements. The data exhibit a clear preference for new-physics contributions, and good fits to the data are obtained in several cases. However, the current measurement of the longitudinal D ∗ polarization in $$ B\to {D}^{\ast}\tau \overline{v} $$ cannot be easily accommodated within its experimental 1σ range. A general analysis of the three-body $$ B\to D\tau \overline{v} $$ and four-body $$ B\to {D}^{\ast}\left(\to D\pi \right)\tau \overline{v} $$ angular distributions is also presented. The accessible angular observables are studied in order to assess their sensitivity to the different new physics scenarios. Experimental information on these distributions would help to disentangle the dynamical origin of the current anomalies.- 5 August 2020
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2020 (8) , 1-46
Open AccessThe role of right-handed neutrinos in $ b\to c\tau \overline{v} $ anomaliesMotivated by the persistent anomalies reported in the $$ b\to c\tau \overline{v} $$ data, we perform a general model-independent analysis of these transitions, in the presence of light right-handed neutrinos. We adopt an effective field theory approach and write a low-energy effective Hamiltonian, including all possible dimension-six operators. The corresponding Wilson coefficients are determined through a numerical fit to all available experimental data. In order to work with a manageable set of free parameters, we define eleven well- motivated scenarios, characterized by the different types of new physics that could mediate these transitions, and analyse which options seem to be preferred by the current measurements. The data exhibit a clear preference for new-physics contributions, and good fits to the data are obtained in several cases. However, the current measurement of the longitudinal D ∗ polarization in $$ B\to {D}^{\ast}\tau \overline{v} $$ cannot be easily accommodated within its experimental 1σ range. A general analysis of the three-body $$ B\to D\tau \overline{v} $$ and four-body $$ B\to {D}^{\ast}\left(\to D\pi \right)\tau \overline{v} $$ angular distributions is also presented. The accessible angular observables are studied in order to assess their sensitivity to the different new physics scenarios. Experimental information on these distributions would help to disentangle the dynamical origin of the current anomalies. - Open Access
- 14 July 2020
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2020 (7) , 1-19
The Higgs and leptophobic force at the LHC
- 14 July 2020
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2020 (7) , 1-19
Open AccessThe Higgs and leptophobic force at the LHC
- Open Access
The Higgs and Leptophobic Force at the LHC
The Higgs boson could provide the key to discover new physics at the Large Hadron Collider. We investigate novel decays of the Standard Model (SM) Higgs boson into leptophobic gauge bosons which can be light in agreement with all experimental constraints. We study the associated production of the SM Higgs and the leptophobic gauge boson that could be crucial to test the existence of a leptophobic force. Our results demonstrate that it is possible to have a simple gauge extension of the SM at the low scale, without assuming very small couplings and in agreement with all the experimental bounds that can be probed at the LHC.
Open AccessThe Higgs and Leptophobic Force at the LHC
The Higgs boson could provide the key to discover new physics at the Large Hadron Collider. We investigate novel decays of the Standard Model (SM) Higgs boson into leptophobic gauge bosons which can be light in agreement with all experimental constraints. We study the associated production of the SM Higgs and the leptophobic gauge boson that could be crucial to test the existence of a leptophobic force. Our results demonstrate that it is possible to have a simple gauge extension of the SM at the low scale, without assuming very small couplings and in agreement with all the experimental bounds that can be probed at the LHC.
- Open Access
- 16 January 2020
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2020 (1) , 91
Axion dark matter, proton decay and unification
We discuss the possibility to predict the QCD axion mass in the context of grand unified theories. We investigate the implementation of the DFSZ mechanism in the context of renormalizable SU(5) theories. In the simplest theory, the axion mass can be predicted with good precision in the range m a = (2–16) neV, and there is a strong correlation between the predictions for the axion mass and proton decay rates. In this context, we predict an upper bound for the proton decay channels with antineutrinos, $$ \tau \left(p\to {K}^{+}\overline{\nu}\right)\lesssim 4\times {10}^{37} $$ yr and $$ \tau \left(p\to {\pi}^{+}\overline{\nu}\right)\lesssim 2\times {10}^{36} $$ yr. This theory can be considered as the minimal realistic grand unified theory with the DFSZ mechanism and it can be fully tested by proton decay and axion experiments.- 16 January 2020
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2020 (1) , 91
Open AccessAxion dark matter, proton decay and unification
We discuss the possibility to predict the QCD axion mass in the context of grand unified theories. We investigate the implementation of the DFSZ mechanism in the context of renormalizable SU(5) theories. In the simplest theory, the axion mass can be predicted with good precision in the range m a = (2–16) neV, and there is a strong correlation between the predictions for the axion mass and proton decay rates. In this context, we predict an upper bound for the proton decay channels with antineutrinos, $$ \tau \left(p\to {K}^{+}\overline{\nu}\right)\lesssim 4\times {10}^{37} $$ yr and $$ \tau \left(p\to {\pi}^{+}\overline{\nu}\right)\lesssim 2\times {10}^{36} $$ yr. This theory can be considered as the minimal realistic grand unified theory with the DFSZ mechanism and it can be fully tested by proton decay and axion experiments. - Open Access
Axion Dark Matter, Proton Decay and Unification
We discuss the possibility to predict the QCD axion mass in the context of grand unified theories. We investigate the implementation of the DFSZ mechanism in the context of renormalizable SU(5) theories. In the simplest theory, the axion mass can be predicted with good precision in the range $m_a = (2-16)$ neV, and there is a strong correlation between the predictions for the axion mass and proton decay rates. In this context, we predict an upper bound for the proton decay channels with antineutrinos, $\tau(p\to K^+ \bar{\nu}) \lesssim 4 \times 10^{37} \text{ yr}$ and $\tau(p \to \pi^+ \bar{\nu}) \lesssim 2 \times 10^{36}\text{ yr}$. This theory can be considered as the minimal realistic grand unified theory with the DFSZ mechanism and it can be fully tested by proton decay and axion experiments.Open AccessAxion Dark Matter, Proton Decay and Unification
We discuss the possibility to predict the QCD axion mass in the context of grand unified theories. We investigate the implementation of the DFSZ mechanism in the context of renormalizable SU(5) theories. In the simplest theory, the axion mass can be predicted with good precision in the range $m_a = (2-16)$ neV, and there is a strong correlation between the predictions for the axion mass and proton decay rates. In this context, we predict an upper bound for the proton decay channels with antineutrinos, $\tau(p\to K^+ \bar{\nu}) \lesssim 4 \times 10^{37} \text{ yr}$ and $\tau(p \to \pi^+ \bar{\nu}) \lesssim 2 \times 10^{36}\text{ yr}$. This theory can be considered as the minimal realistic grand unified theory with the DFSZ mechanism and it can be fully tested by proton decay and axion experiments. - Open Access
- 15 November 2019
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2019 (11) , 93
The QCD axion and unification
The QCD axion is one of the most appealing candidates for the dark matter in the Universe. In this article, we discuss the possibility to predict the axion mass in the context of a simple renormalizable grand unified theory where the Peccei-Quinn scale is determined by the unification scale. In this framework, the axion mass is predicted to be in the range ma ≃ (3–13) × 10−9 eV. We study the axion phenomenology and find that the ABRACADABRA and CASPEr-Electric experiments will be able to fully probe this mass window.
- 15 November 2019
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2019 (11) , 93
Open AccessThe QCD axion and unification
The QCD axion is one of the most appealing candidates for the dark matter in the Universe. In this article, we discuss the possibility to predict the axion mass in the context of a simple renormalizable grand unified theory where the Peccei-Quinn scale is determined by the unification scale. In this framework, the axion mass is predicted to be in the range ma ≃ (3–13) × 10−9 eV. We study the axion phenomenology and find that the ABRACADABRA and CASPEr-Electric experiments will be able to fully probe this mass window.
- Open Access
The QCD Axion and Unification
The QCD axion is one of the most appealing candidates for the dark matter in the Universe. In this article, we discuss the possibility to predict the axion mass in the context of a simple renormalizable grand unified theory where the Peccei-Quinn scale is determined by the unification scale. In this framework, the axion mass is predicted to be in the range $m_a \simeq (3 - 13) \times 10^{-9} \ \rm{eV}$. We study the axion phenomenology and find that the ABRACADABRA and CASPEr-Electric experiments will be able to fully probe this mass window.Open AccessThe QCD Axion and Unification
The QCD axion is one of the most appealing candidates for the dark matter in the Universe. In this article, we discuss the possibility to predict the axion mass in the context of a simple renormalizable grand unified theory where the Peccei-Quinn scale is determined by the unification scale. In this framework, the axion mass is predicted to be in the range $m_a \simeq (3 - 13) \times 10^{-9} \ \rm{eV}$. We study the axion phenomenology and find that the ABRACADABRA and CASPEr-Electric experiments will be able to fully probe this mass window. - Open Access
- 13 September 2019
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2019 (9) , 103
Global fit to b → cτν transitions
We perform a general model-independent analysis of $$ b\to c\tau {\overline{\nu}}_{\tau } $$ transitions, including measurements of ℛ D , ℛ D∗, their q 2 differential distributions, the recently measured longitudinal D* polarization $$ {F}_L^{D\ast } $$ , and constraints from the $$ {B}_c\to \tau {\overline{\nu}}_{\tau } $$ lifetime, each of which has significant impact on the fit. A global fit to a general set of Wilson coefficients of an effective low-energy Hamiltonian is presented, the solutions of which are interpreted in terms of hypothetical new-physics mediators. From the obtained results we predict selected $$ b\to c\tau {\overline{\nu}}_{\tau } $$ observables, such as the baryonic transition $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ , the ratio ℛ J/ψ , the forward-backward asymmetries $$ {\mathcal{A}}_{\mathrm{FB}}^{D\left(\ast \right)} $$ , the τ polarization asymmetries $$ {\mathcal{P}}_{\tau}^{D\left(\ast \right)} $$ , and the longitudinal D* polarization fraction $$ {F}_L^{D\ast } $$ . The latter shows presently a slight tension with any new-physics model, such that an improved measurement could have an important impact. We also discuss the potential change due the very recently announced preliminary $$ {\mathrm{\mathcal{R}}}_{\mathcal{D}\left(\ast \right)} $$ measurement by the Belle collaboration.- 13 September 2019
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2019 (9) , 103
Open AccessGlobal fit to b → cτν transitions
We perform a general model-independent analysis of $$ b\to c\tau {\overline{\nu}}_{\tau } $$ transitions, including measurements of ℛ D , ℛ D∗, their q 2 differential distributions, the recently measured longitudinal D* polarization $$ {F}_L^{D\ast } $$ , and constraints from the $$ {B}_c\to \tau {\overline{\nu}}_{\tau } $$ lifetime, each of which has significant impact on the fit. A global fit to a general set of Wilson coefficients of an effective low-energy Hamiltonian is presented, the solutions of which are interpreted in terms of hypothetical new-physics mediators. From the obtained results we predict selected $$ b\to c\tau {\overline{\nu}}_{\tau } $$ observables, such as the baryonic transition $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ , the ratio ℛ J/ψ , the forward-backward asymmetries $$ {\mathcal{A}}_{\mathrm{FB}}^{D\left(\ast \right)} $$ , the τ polarization asymmetries $$ {\mathcal{P}}_{\tau}^{D\left(\ast \right)} $$ , and the longitudinal D* polarization fraction $$ {F}_L^{D\ast } $$ . The latter shows presently a slight tension with any new-physics model, such that an improved measurement could have an important impact. We also discuss the potential change due the very recently announced preliminary $$ {\mathrm{\mathcal{R}}}_{\mathcal{D}\left(\ast \right)} $$ measurement by the Belle collaboration. - Open Access
- 30 August 2019
- Published by American Physical Society (APS) in Physical Review D
- Vol. 100 (3) , 035041
Neutrino-dark matter connections in gauge theories
We discuss the connection between the origin of neutrino masses and the properties of dark matter candidates in the context of gauge extensions of the Standard Model. We investigate minimal gauge theories for neutrino masses where the neutrinos are predicted to be Dirac or Majorana fermions. We find that the upper bound on the effective number of relativistic species provides a strong constraint in the scenarios with Dirac neutrinos. In the context of theories where the lepton number is a local gauge symmetry spontaneously broken at the low scale, the existence of dark matter is predicted from the condition of anomaly cancellation. Applying the cosmological bound on the dark matter relic density, we find an upper bound on the symmetry breaking scale in the multi-TeV region. These results imply that we could test simple gauge theories for neutrino masses at current or future experiments.
- 30 August 2019
- Published by American Physical Society (APS) in Physical Review D
- Vol. 100 (3) , 035041
Open AccessNeutrino-dark matter connections in gauge theories
We discuss the connection between the origin of neutrino masses and the properties of dark matter candidates in the context of gauge extensions of the Standard Model. We investigate minimal gauge theories for neutrino masses where the neutrinos are predicted to be Dirac or Majorana fermions. We find that the upper bound on the effective number of relativistic species provides a strong constraint in the scenarios with Dirac neutrinos. In the context of theories where the lepton number is a local gauge symmetry spontaneously broken at the low scale, the existence of dark matter is predicted from the condition of anomaly cancellation. Applying the cosmological bound on the dark matter relic density, we find an upper bound on the symmetry breaking scale in the multi-TeV region. These results imply that we could test simple gauge theories for neutrino masses at current or future experiments.
- Open Access
Neutrino-Dark Matter Connections in Gauge Theories
We discuss the connection between the origin of neutrino masses and the properties of dark matter candidates in the context of gauge extensions of the Standard Model. We investigate minimal gauge theories for neutrino masses where the neutrinos are predicted to be Dirac or Majorana fermions. We find that the upper bound on the effective number of relativistic species provides a strong constraint in the scenarios with Dirac neutrinos. In the context of theories where the lepton number is a local gauge symmetry spontaneously broken at the low scale, the existence of dark matter is predicted from the condition of anomaly cancellation. Applying the cosmological bound on the dark matter relic density, we find an upper bound on the symmetry breaking scale in the multi-TeV region. These results imply we could hope to test simple gauge theories for neutrino masses at current or future experiments.
Open AccessNeutrino-Dark Matter Connections in Gauge Theories
We discuss the connection between the origin of neutrino masses and the properties of dark matter candidates in the context of gauge extensions of the Standard Model. We investigate minimal gauge theories for neutrino masses where the neutrinos are predicted to be Dirac or Majorana fermions. We find that the upper bound on the effective number of relativistic species provides a strong constraint in the scenarios with Dirac neutrinos. In the context of theories where the lepton number is a local gauge symmetry spontaneously broken at the low scale, the existence of dark matter is predicted from the condition of anomaly cancellation. Applying the cosmological bound on the dark matter relic density, we find an upper bound on the symmetry breaking scale in the multi-TeV region. These results imply we could hope to test simple gauge theories for neutrino masses at current or future experiments.