Measurement of ( 2 S ) polarisation in pp collisions at s = 7 TeV
نویسندگان
چکیده
The polarisation of prompt ψ(2S) mesons is measured by performing an angular analysis of ψ(2S) → μ+μ− decays using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb detector at a centre-of-mass energy of 7 TeV. The polarisation is measured in bins of transverse momentum pT and rapidity y in the kinematic region 3.5 < pT < 15GeV/c and 2.0 < y < 4.5, and is compared to theoretical models. No significant polarisation is observed.
منابع مشابه
Mid - rapidity anti - baryon to baryon ratios in pp collisions at √ s = 0 . 9 , 2 . 76 and 7 TeV measured by ALICE
The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for p/p, //, + // − and + // − in pp collisions at √ s = 0.9, 2.76 and 7 TeV, measured with the ALICE detector at the LHC, are reported. Within the experimental uncertainties and ranges covered by our measurement, these ratios are independent of rapidity, transverse momentum and multiplicit...
متن کاملMeasurement of the WW cross section in s = 7 TeV pp collisions with the ATLAS detector and limits on
The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Measurement of the W W cross section in √ s = 7 TeV pp collisions with the ATLAS detector and limits on anomalous gauge couplings ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t This Letter reports a measurement of the W W production cross section in √ s = 7 TeV pp...
متن کاملMeasurement of the cross sections for the production of W and Z bosons in association with jets and heavy flavours in pp collisions at √ s = 7 TeV with the ATLAS detector
Measurement of the cross sections for the production of W and Z bosons in association with jets and heavy flavours in pp collisions at √ s = 7 TeV with the ATLAS detector Preliminary measurements are presented of the cross sections for the production of W and Z bosons in association with jets in pp collisions at √ s = 7 TeV. The measurements are based on 35 pb −1 of data collected with the ATLA...
متن کاملMeasurement of the top quark cross - section in the single - lepton channel in pp collisions at √ s = 7 TeV using kinematic fits and b - tagging information with the ATLAS Experiment
The measurement of the t ¯ t production cross-section in the single-lepton channel in pp collisions at a centre-of-mass energy √ s =7 TeV is presented. The analysis is based on a multivariate discriminant distribution in 3, 4 and ≥ 5 jet bins using three kinematic variables and b-tagging information. With a data sample of about 35 pb −1 recorded by ATLAS in 2010 the inclusive top quark producti...
متن کاملImproved luminosity determination in pp collisions at √ s = 7 TeV using the ATLAS detector at the LHC
The luminosity calibration for the ATLAS detector at the LHC during pp collisions at √ s = 7 TeV in 2010 and 2011 is presented. Evaluation of the luminosity scale is performed using several luminosity-sensitive detectors, and comparisons are made of the long-term stability and accuracy of this calibration applied to the pp collisions at √ s = 7 TeV. A luminosity uncertainty of δL/L = ±3.5 % is ...
متن کامل