### Conveners

#### Parallel - WG1-PREC

- Andreas Meyer (DESY)
- Jenny List (DESY)
- Andreas Meyer (DESY)
- Paolo Azzurri (INFN Pisa)
- Adrian Irles (IFIC (CSIC/UV) Valencia)
- JORGE DE BLAS (University of Granada)
- Fabio Maltoni Maltoni (UCL)
- Paolo Azzurri
- Patrick Koppenburg (Nikhef)
- Ayres Freitas (University of Pittsburgh)

Our recent work has shown that a novel, much higher granularity

forward calorimetry concept can enable much more detailed and precise

reconstruction than the baseline designs based on LEP luminometers, together

with the capability of electron/positron/photon separation.

This new calorimeter concept is designed primarily to maximize the acceptance

for $e^+e^- \to \gamma \gamma$ as an...

We classify the possible deviations from the Standard Model in the QED-dominated $\mathrm{e^+e^-}\to\gamma\gamma$ process under the assumption of a preserved $SU(2)_L \times U(1)_Y$ symmetry. We find that the only deviations really observable in practice correspond to a correction of the differential cross section by a factor $(1 + \frac{c_8~s^2}{8\pi\alpha\Lambda^4}~\sin^2\theta)$, where...

Long-range angular correlations between particles could reveal physics beyond the Standard Model, such as Hidden Valley (HV) scenarios. Our emphasis is on a hidden QCD-like sector, where the emergence of HV matter alongside QCD partonic cascades could amplify and extend azimuthal correlations among final-state particles.

Our study at the detector level focuses on the detectability of these...

Precision measurement of the integrated luminosity (L) at future Higgs factories, including ILC, is of crucial importance for the cross-section measurements, and in particular for the line-shape measurements at the Z-pole. Since there is no up-to-date estimate of the integrated luminosity

uncertainties arising from metrology effects at ILC, here we review a feasibility of the targeted...