Measurement of the $$p \bar{p} \to WZ + X$$ cross-section at $$\sqrt{s}$$ = 1.96-TeV and limits on WWZ trilinear gauge couplings

Journal Article · Sat Sep 01 04:00:00 EDT 2007 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.76.111104· OSTI ID:1893391

Abazov, V. M.

We present measurements of the process $$p\bar{p} \to WZ+X \to \ell^{\prime} \nu_{\ell^{\prime}} \ell \bar{\ell}$$ at $$\sqrt{s}=1.96$$ TeV, where $$\ell$$ and $$\ell^{\prime}$$ are electrons or muons. Using 1 fb$$^{-1}$$ of data from the D0 experiment, we observe 13 candidates with an expected background of $$4.5\pm0.6$$ events and measure a cross section $$\sigma(WZ)=2.7^{+1.7}_{-1.3}$$ pb. From the number of observed events and the $$Z$$ boson transverse momentum distribution, we limit the trilinear $WWZ$ gauge couplings to $$-0.17 \le \lambda_Z \le 0.21$$ $$(\Delta \kappa_Z = 0)$$ at the 95% C.L. for a form factor scale $$\Lambda=2$$ TeV. Further, assuming that $$\Delta g^Z_1 = \Delta\kappa_Z$$, we find $$-0.12 \le \Delta\kappa_Z \le 0.29$$ $$(\lambda_Z=0)$$ at the 95% C.L. These are the most restrictive limits on the $WWZ$ couplings available to date.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Contributing Organization: D0
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1893391
• Report Number(s): FERMILAB-PUB-07-488-E; arXiv:0709.2917; oai:inspirehep.net:761244
• Journal Information: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 76
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS