LHCb - Minimum Bias physics plans and MC framework - EPFL
LHCb - Minimum Bias physics plans and MC framework - EPFL LHCb - Minimum Bias physics plans and MC framework - EPFL
Strangeness production No valence strange quarks in the initial state, strangeness probes fragmentation field in a unique way. Non-diff, prompt Λ and ¯Λ. ¯Λ/Λ 1.05 1 0.95 0.9 0.85 LHCb MC generator level 5 TeV/beam LHCb LHCb+S0APro LHCb+P0 LHCb+PX LHCb+P3 LHCb+P6 LHCb+PNOCR LHCb+PSoft LHCb+PHard 0.8 −10 −8 −6 −4 −2 0 2 4 6 8 10 η The distributions were obtained by varying consistently PYTHIA parameters related to: parton distribution functions, initial state radiation, final state radiation, beam remnant, hadronization, underlying event, color reconnection see P. Skands on Perugia tunes on top of LHCb specific MC tunings. MCNet CERN R. Mures¸an, LHCb report – p.9/30
Strangeness production No valence strange quarks in the initial state, strangeness probes fragmentation field in a unique way. Non-diff, prompt Λ and ¯Λ. ¯Λ/Λ 1.05 1 0.95 0.9 0.85 LHCb MC generator level 5 TeV/beam LHCb LHCb+S0APro LHCb+P0 LHCb+PX LHCb+P3 LHCb+P6 LHCb+PNOCR LHCb+PSoft LHCb+PHard 0.8 −10 −8 −6 −4 −2 0 2 4 6 8 10 η Up to 5% difference in the LHCb kinematic region, only 1% for the central detectors; Baryon number transport: get as close to the beam as possible! And this is only what (a bunch of) theorists thought of −→ “New physics” might be round the corner MCNet CERN R. Mures¸an, LHCb report – p.9/30
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Strangeness production<br />
No valence strange quarks in the initial state, strangeness probes<br />
fragmentation field in a unique way.<br />
Non-diff, prompt Λ <strong>and</strong> ¯Λ.<br />
¯Λ/Λ<br />
1.05<br />
1<br />
0.95<br />
0.9<br />
0.85<br />
<strong>LHCb</strong> <strong>MC</strong> generator level 5 TeV/beam<br />
<strong>LHCb</strong><br />
<strong>LHCb</strong>+S0APro<br />
<strong>LHCb</strong>+P0<br />
<strong>LHCb</strong>+PX<br />
<strong>LHCb</strong>+P3<br />
<strong>LHCb</strong>+P6<br />
<strong>LHCb</strong>+PNOCR<br />
<strong>LHCb</strong>+PSoft<br />
<strong>LHCb</strong>+PHard<br />
0.8<br />
−10 −8 −6 −4 −2 0 2 4 6 8 10<br />
η<br />
Up to 5% difference in<br />
the <strong>LHCb</strong> kinematic<br />
region, only 1% for the<br />
central detectors;<br />
Baryon number<br />
transport: get as close<br />
to the beam as possible!<br />
And this is only what<br />
(a bunch of) theorists<br />
thought of −→<br />
“New <strong>physics</strong>” might be<br />
round the corner<br />
<strong>MC</strong>Net CERN R. Mures¸an, <strong>LHCb</strong> report – p.9/30
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