B. Kaynak | Search arXiv

arXiv2026

CMS ECAL VFE Production Qualification

Upgrading the CMS ECAL barrel for the HL-LHC requires replacement of all on-detector electronics, including 12240 Very-Front-End (VFE) cards employing CATIA and LiTE-DTU ASICs for amplification and digitisation of signals from ECAL's 61200 lead-tungstate crystals. All production VFEs undergo the same qualification procedure: functional testing, environmental stress screening, and calibration. We have received and functionally tested 13596 unique VFEs; two never passed our test criteria. Results for other VFEs are uniform and within expectations, demonstrating the excellent quality of the cards. Key metrics, such as a gain ratio of $10.21 \pm 0.07$ and power consumption of $1.805 \pm 0.013~\mathrm{W}$, demonstrate high consistency across the batch.

physics.ins-det↗

arXiv2021

Characterisation of the dip-bump structure observed in proton-proton elastic scattering at $\sqrt s$ = 8 TeV

The TOTEM collaboration at the CERN LHC has measured the differential cross-section of elastic proton-proton scattering at $\sqrt{s} = 8\ {\rm TeV}$ in the squared four-momentum transfer range $0.2\ {\rm GeV^{2}} < |t| < 1.9\ {\rm GeV^{2}}$. This interval includes the structure with a diffractive minimum ("dip") and a secondary maximum ("bump") that has also been observed at all other LHC energies, where measurements were made. A detailed characterisation of this structure for $\sqrt{s} = 8\ {\rm TeV}$ yields the positions, $|t|_{\rm dip} = (0.521 \pm 0.007)\ {\rm GeV^2}$ and $|t|_{\rm bump} = (0.695 \pm 0.026)\ {\rm GeV^2}$, as well as the cross-section values, ${{\rm d}σ/{\rm d} t}_{\rm dip} = (15.1 \pm 2.5)\ {\rm{μb/GeV^2}}$ and ${{\rm d}σ/{\rm d} t}_{\rm bump} = (29.7 \pm 1.8)\ {\rm{μb/GeV^2}}$, for the dip and the bump, respectively.

hep-ex↗