A measurement of the W boson pair production cross section in proton-proton collisions at $$\sqrt{s} = 8$$ TeV is presented. The data collected with the CMS detector at the LHC correspond to an integrated luminosity of 19.4$$\,\text {fb}^\text {-1}$$. The $${{\mathrm{W} }^{+} }\mathrm{W}^{-}$$ candidates are selected from events with two charged leptons, electrons or muons, and large missing transverse energy. The measured $${{\mathrm{W} }^{+} }\mathrm{W}^{-}$$ cross section is $$60.1\pm 0.9\,\text {(stat)} \pm 3.2\,\text {(exp)} \pm 3.1\,\text {(theo)} \pm 1.6\,\text {(lumi)} \text {\,pb} = 60.1\pm 4.8\text {\,pb}$$, consistent with the standard model prediction. The $${{\mathrm{W} }^{+} }\mathrm{W}^{-}$$ cross sections are also measured in two different fiducial phase space regions. The normalized differential cross section is measured as a function of kinematic variables of the final-state charged leptons and compared with several perturbative QCD predictions. Limits on anomalous gauge couplings associated with dimension-six operators are also given in the framework of an effective field theory. The corresponding 95 % confidence level intervals are $$-5.7< c_{\mathrm {WWW}}/\Lambda ^2 < 5.9\,\mathrm{TeV}^{-2}$$, $$-11.4< c_{\mathrm {W}}/\Lambda ^2 < 5.4\,\mathrm{TeV}^{-2}$$, $$-29.2< c_{\mathrm {B}}/\Lambda ^2 < 23.9\,\mathrm{TeV}^{-2}$$, in the HISZ basis.

### Measurement of the W+W- cross section in pp collisions at sqrt(s) = 8 TeV and limits on anomalous gauge couplings

#### Abstract

A measurement of the W boson pair production cross section in proton-proton collisions at $$\sqrt{s} = 8$$ TeV is presented. The data collected with the CMS detector at the LHC correspond to an integrated luminosity of 19.4$$\,\text {fb}^\text {-1}$$. The $${{\mathrm{W} }^{+} }\mathrm{W}^{-}$$ candidates are selected from events with two charged leptons, electrons or muons, and large missing transverse energy. The measured $${{\mathrm{W} }^{+} }\mathrm{W}^{-}$$ cross section is $$60.1\pm 0.9\,\text {(stat)} \pm 3.2\,\text {(exp)} \pm 3.1\,\text {(theo)} \pm 1.6\,\text {(lumi)} \text {\,pb} = 60.1\pm 4.8\text {\,pb}$$, consistent with the standard model prediction. The $${{\mathrm{W} }^{+} }\mathrm{W}^{-}$$ cross sections are also measured in two different fiducial phase space regions. The normalized differential cross section is measured as a function of kinematic variables of the final-state charged leptons and compared with several perturbative QCD predictions. Limits on anomalous gauge couplings associated with dimension-six operators are also given in the framework of an effective field theory. The corresponding 95 % confidence level intervals are $$-5.7< c_{\mathrm {WWW}}/\Lambda ^2 < 5.9\,\mathrm{TeV}^{-2}$$, $$-11.4< c_{\mathrm {W}}/\Lambda ^2 < 5.4\,\mathrm{TeV}^{-2}$$, $$-29.2< c_{\mathrm {B}}/\Lambda ^2 < 23.9\,\mathrm{TeV}^{-2}$$, in the HISZ basis.
##### Scheda breve Scheda completa
File in questo prodotto:
File
art_10.1140_epjc_s10052-016-4219-1.pdf

accesso aperto

Tipologia: Documento in Versione Editoriale
Licenza: Creative commons
Dimensione 1.55 MB
Formato Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2886266
• ND
• 66
• 56