Valentina Vecchio


Research Associate at the University of Manchester

My Career

I’m a particle physicist with a strong passion for uncovering the fundamental building blocks of our universe. Here’s a brief overview of my academic and research journey so far.

Post-doc

I joined the University of Manchester in November 2019 as a Research Associate.
My work focuses on precision measurements of the Higgs boson properties, using the ATLAS detector at CERN.

I designed and led the very first ATLAS measurement of the associated production of the Higgs boson with a single top quark. This measurement has been recently published on JHEP 10 (2025) 093 and shows an interesting deviation of the measured cross section when compared to the theory prediction. limitplot The observed significance of the signal above the background-only expectation is 2.8, a value that is higher than the expected 0.4 and demands further investigation through more accurate measurements.

A significant part of my research is dedicated to the identification of heavy-flavoured jets and the evaluation of their performance in collision data.
I am currently the convener of a fantastic team that developed a transformer-based algorithm, which has significantly improved heavy-flavour identification performance within the ATLAS detector. The work had been submitted to Nature Communications and currently available on arXiv:2505.19689. The architecture’s unique feature stands in the physics-informed auxiliary tasks that helps not only improve the primary target of the model, which is to predict the flavour of a reconstructed jet, but also the interpretability of its results. gn2scketch

Here is one of the plots I’m most proud of — it highlights the historical improvement in performance and how well it holds up with actual collision data:
niceplot

Ph.D

My Ph.D. thesis introduced a novel method to extract the top-quark coupling to the bottom-quark. It also included the measurement of heavy-flavour tagging performance using multi-jet events, and the construction of Micromegas detectors for the upgrade of the ATLAS Small Wheel 1 2.

During my Ph.D I was awarded a prestigous fellowship by INFN (Istituto Nazionale Fisica Nucleare) that allowed me to spend one year at CERN.

Master’s

For my Master’s thesis, I contributed to the first evidence of the associated production of the Higgs boson with a pair of top quarks, achieved in 2018.

In 2015, I spent a summer in Chicago working as an intern at Fermilab National Lab.
There, I developed a new method for optimizing electron selection for the W-asymmetry measurement, using the CDF detector.