Outputs (9)

Detecting gravitational waves from cosmological phase transitions with LISA: an update (2020)
Journal Article
Caprini, C., Chala, M., Dorsch, G. C., Hindmarsh, M., Huber, S. J., Konstandin, T., …Weir, D. J. (2020). Detecting gravitational waves from cosmological phase transitions with LISA: an update. Journal of Cosmology and Astroparticle Physics, 2020(03), Article 024. https://doi.org/10.1088/1475-7516/2020/03/024

We investigate the potential for observing gravitational waves from cosmological phase transitions with LISA in light of recent theoretical and experimental developments. Our analysis is based on current state-of-the-art simulations of sound waves in... Read More about Detecting gravitational waves from cosmological phase transitions with LISA: an update.

Novel B-decay signatures of light scalars at high energy facilities (2019)
Journal Article
Blance, A., Chala, M., Ramos, M., & Spannowsky, M. (2019). Novel B-decay signatures of light scalars at high energy facilities. Physical Review D, 100(11), Article 115015. https://doi.org/10.1103/physrevd.100.115015

We study the phenomenology of light scalars of masses m1 and m2 coupling to heavy flavor-violating vector bosons of mass mV. For m1;2 ≲ few GeV, this scenario triggers the rare B meson decays B0s → 3μþ3μ−, B0 → 3μþ3μ−, Bþ → Kþ3μþ3μ−, and B0s → K03μþ3... Read More about Novel B-decay signatures of light scalars at high energy facilities.

Higgs phenomenology as a probe of sterile neutrinos (2019)
Journal Article
Butterworth, J. M., Chala, M., Englert, C., Spannowsky, M., & Titov, A. (2019). Higgs phenomenology as a probe of sterile neutrinos. Physical Review D, 100(11), Article 115019. https://doi.org/10.1103/physrevd.100.115019

Physics beyond the Standard Model can manifest itself as both new light states and heavy degrees of freedom. In this paper, we assume that the former comprise only a sterile neutrino, N. Therefore, the most agnostic description of the new physics is... Read More about Higgs phenomenology as a probe of sterile neutrinos.

Probes of the Standard Model effective field theory extended with a right-handed neutrino (2019)
Journal Article
Alcaide, J., Banerjee, S., Chala, M., & Titov, A. (2019). Probes of the Standard Model effective field theory extended with a right-handed neutrino. Journal of High Energy Physics, 2019(8), Article 31. https://doi.org/10.1007/jhep08%282019%29031

If neutrinos are Dirac particles and, as suggested by the so far null LHC results, any new physics lies at energies well above the electroweak scale, the Standard Model effective field theory has to be extended with operators involving the right-hand... Read More about Probes of the Standard Model effective field theory extended with a right-handed neutrino.

Delta ACP within the Standard Model and beyond (2019)
Journal Article
Chala, M., Lenz, A., Rusov, A. V., & Scholtz, J. (2019). Delta ACP within the Standard Model and beyond. Journal of High Energy Physics, 2019(7), Article 161. https://doi.org/10.1007/jhep07%282019%29161

In light of the recent LHCb observation of CP violation in the charm sector, we review standard model (SM) predictions in the charm sector and in particular for ∆ACP. We get as an upper bound in the SM |∆ASM CP| ≤ 3.6 × 10−4 , which can be compared t... Read More about Delta ACP within the Standard Model and beyond.

Gravitational wave and collider probes of a triplet Higgs sector with a low cutoff (2019)
Journal Article
Chala, M., Ramos, M., & Spannowsky, M. (2019). Gravitational wave and collider probes of a triplet Higgs sector with a low cutoff. The European Physical Journal C, 79(2), Article 156. https://doi.org/10.1140/epjc/s10052-019-6655-1

We study the scalar triplet extension of the standard model with a low cutoff, preventing large corrections to the quadratic masses that would otherwise worsen the hierarchy problem. We explore the reach of LISA to test the parameter space region of... Read More about Gravitational wave and collider probes of a triplet Higgs sector with a low cutoff.

Behavior of composite resonances breaking lepton flavor universality (2018)
Journal Article
Chala, M., & Spannowsky, M. (2018). Behavior of composite resonances breaking lepton flavor universality. Physical Review D, 98(3), Article 035010. https://doi.org/10.1103/physrevd.98.035010

Within the context of composite Higgs models, recent hints on lepton flavor nonuniversality in B decays can be explained by a vector resonance V with sizeable couplings to the Standard Model leptons ( ℓ ). We argue that, in such a case, spin- 1 / 2 l... Read More about Behavior of composite resonances breaking lepton flavor universality.

Signals of the electroweak phase transition at colliders and gravitational wave observatories (2018)
Journal Article
Chala, M., Krause, C., & Nardini, G. (2018). Signals of the electroweak phase transition at colliders and gravitational wave observatories. Journal of High Energy Physics, 2018(07), Article 062. https://doi.org/10.1007/jhep07%282018%29062

If the electroweak phase transition (EWPT) is of strongly first order due to higher dimensional operators, the scale of new physics generating them is at the TeV scale or below. In this case the effective-field theory (EFT) neglecting operators of di... Read More about Signals of the electroweak phase transition at colliders and gravitational wave observatories.

Searches for vector-like quarks at future colliders and implications for composite Higgs models with dark matter (2018)
Journal Article
Chala, M., Gröber, R., & Spannowsky, M. (2018). Searches for vector-like quarks at future colliders and implications for composite Higgs models with dark matter. Journal of High Energy Physics, 2018(3), Article 040. https://doi.org/10.1007/jhep03%282018%29040

Many composite Higgs models predict the existence of vector-like quarks with masses outside the reach of the LHC, e.g. m Q ≳ 2 TeV, in particular if these models contain a dark matter candidate. In such models the mass of the new resonances is bounde... Read More about Searches for vector-like quarks at future colliders and implications for composite Higgs models with dark matter.