Transverse sphericity of primary charged particles in minimum bias proton-proton collisions at root s=0.9, 2.76 and 7 TeV

Measurements of the sphericity of primary charged particles in minimum bias proton-proton collisions at root s = 0.9, 2.76 and 7 TeV with the ALICE detector at the LHC are presented. The observable is measured in the plane perpendicular to the beam direction using primary charged tracks with p(T) > 0.5 GeV/c in vertical bar eta vertical bar < 0.8. The mean sphericity as a function of the charged particle multiplicity at mid-rapidity (N-ch) is reported for events with different p(T) scales ("soft" and "hard") defined by the transverse momentum of the leading particle. In addition, the mean charged particle transverse momentum versus multiplicity is presented for the different event classes, and the sphericity distributions in bins of multiplicity are presented. The data are compared with calculations of standard Monte Carlo event generators. The transverse sphericity is found to grow with multiplicity at all collision energies, with a steeper rise at low N-ch, whereas the event generators show an opposite tendency. The combined study of the sphericity and the mean p(T) with multiplicity indicates that most of the tested event generators produce events with higher multiplicity by generating more back-to-back jets resulting in decreased sphericity (and isotropy). The PYTHIA6 generator with tune PERUGIA-2011 exhibits a noticeable improvement in describing the data, compared to the other tested generators.

Measurement of prompt J/psi and beauty hadron production cross sections at mid-rapidity in pp collisions at root s=7 TeV

The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at root s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L-int = 5.6 nb(-1). The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum p(t) > 1,3 GeV/c and rapidity vertical bar y vertical bar < 0.9. The cross section for prompt J/psi mesons, i.e. directly produced J/psi and prompt decays of heavier charmonium states such as the psi(2S) and chi(c) resonances, is sigma(prompt J/psi) (p(t) > 1.3 GeV/c, vertical bar y vertical bar < 0.9) = 8.3 +/- 0.8(stat.) +/- 1.1 (syst.)(-1.4)(+1.5) (syst. pol.) mu b. The cross section for the production of b-hadrons decaying to J/psi with p(t) > 1.3 GeV/c and vertical bar y vertical bar < 0.9 is a sigma(J/psi <- hB) (p(t) > 1.3 GeV/c, vertical bar y vertical bar < 0.9) = 1.46 +/- 0.38 (stat.)(-0.32)(+0.26) (syst.) mu b. The results are compared to QCD model predictions. The shape of the p(t) and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the b (b) over bar pair total cross section and d sigma/dy at mid-rapidity.

Report of the Bureau of Archives for the Province of Ontario.

Edited by: <1909>- , A. Fraser.

Bulletin - Department of Agricultural Technical Services.

Contains numbered sub-series of various institutes and stations.

A digital-computer model of the Big Sioux aquifer in Minnehaha County, South Dakota /

Mode of access: Internet.

The garden of Eden and the flood.

Attempts to locate the garden of Eden in North America, on the strength of the fossil discoveries in the "Ashley beds" of South Carolina.

Annual report of the Bureau of Labor Statistics of the State of North Carolina.

Vols. for 11th-12th, 1897-98 include 1st-2nd reports of the Inspector of Mines.

Biennial report of the Board of Charities and Corrections, State of South Dakota.

Description based on: 23rd (June 30, 1934).

Biennial report of the Department of Labor [serial] /

Report year ends June 30.

Journal of agriculture, South Australia.

Title from cover.

Report to the Science and Art Department of the Committee of Council on Education on the action of light on water colours : presented to both Houses of Parliament by command of Her Majesty.

"First report by Dr. W.J. Russell, F.R.S., and Capt. W. de W. Abney ..."--P. [3].

South Carolina tobacco directory

This tobacco directory list tobacco products sold in South Carolina by name, company name, original certification date, action type and agreement type.

South Carolina tobacco directory

This tobacco directory list tobacco products sold in South Carolina by name, company name, original certification date, action type and agreement type.

Let your voice be heard : a guide to services available to empower victims of domestic violence : Lowcountry

This brochure gives directions on how to leave an abusive relationship. It also has a list of community resources and hotlines (by county) available to victims of domestic violence in the lowcountry region of South Carolina.

Let your voice be heard : a guide to services available to empower victims of domestic violence : Pee Dee

This brochure gives directions on how to leave an abusive relationship. It also has a list of community resources and hotlines (by county) available to victims of domestic violence in the Pee Dee Region of South Carolina.