This Letter reports the observation of single top quarks produced together with a photon, which directly probes the electroweak coupling of the top quark. The analysis uses 139 fb−1 of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. Requiring a photon with transverse momentum larger than 20 GeV and within the detector acceptance, the fiducial cross section is measured to be 688
23ðstatÞ þ75 −71 ðsystÞ fb, to be compared with the standard model prediction of 515þ36 −42 fb at next-to-leading order in QCD.

العنوان

PHYSICAL REVIEW LETTERS

الناشر

APS

بلد الناشر

الولايات المتحدة الأمريكية

نوع المنشور

مطبوع فقط

المجلد

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السنة

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الصفحات

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