2011 QCD and High Energy Interactions - Rencontres de Moriond ...

More documents

Recommendations

Info

Table 1: Main phases of 2010 commissioning. Date Commissioning phase 28 th February Injection of both beams, rough RF capture 30 th March First colliding beams at 3.5 TeV March Initial commissioning leading to first collisions April Squeeze commissioning May Physics 13 on 13 bunches with 2 × 10 10 protons per bunch June Commissioning of nominal bunch intensity July Physics 25 on 25 bunches with 9 × 10 10 protons per bunch August 3 weeks running with stored beam energy of 1 to 2 MJ September Bunch train commissioning Oct -Nov Phased increase in total beam intensity Table 2: 2010 commissioning: some notable records. Data courtesy of Atlas. Peak stable luminosity 2.07 × 10 32 cm −2 s −1 Maximum luminosity delivered in one fill 6.3 pb -1 Maximum luminosity delivered in one day 6.0 pb -1 Maximum luminosity delivered in 7 days 24.6 pb -1 Maximum colliding bunches 348 Maximum average events/bunch crossing 3.78 Longest time in Stable Beams – one fill 30.3 hours Longest time in Stable Beams – one day 22.8 hours (94.9%) Longest time in Stable Beams – 7 days 69.9 hours (41.6%) Faster turnaround (protons) 3.66 hours Maximum stored beam energy at 3.5 TeV 28 MJ Maximum stored beam energy in physics 24 MJ 3 Machine status in 2010 2010 was a intense year of commissioning with many issues and problems addressed 1 . When the dust had settled the following key features related to beam based operation may be noted. • The machine is magnetically and optically well understood with excellent agreement between the magnetic and optics models and measured beam parameters. • The LHC is magnetically reproducible. This has proved important because set-up remains valid from fill to fill, and indeed from month to month. • The aperture has been measure carefully and is as expected. • The operational sequence, after a lot of hard work, allows the beams to be taken through the ramp, squeeze and into collision essentially without loss. • Better than nominal beam intensity and beam emittance was delivered by the injectors resulting in excellent luminosity performance for a given beam current. • It was possible to collide nominal bunch currents with smaller that nominal emittances with no serious problems from head-on beam-beam. This important result is another key reason behind the impressive luminosity performance.
• There was excellent cleaning by the collimator system and good control of beam losses at all stages of operation. There were no accidental beam induced quenches above injection energy. The key machine parameters used in 2010 are shown in Table 3. Table 3: Main machine parameter in use in 2010 compared with nominal 7 TeV values. Parameter 2010 Nominal Energy [TeV] 3.5 7.0 β∗ [m] 3.5, 3.5, 3.5, 3.5 0.55, 10, 0.55, 10 Normalized emittance [µ m] 2.0 - 3.5 3.75 (start of fill) Bunch current 1.2e11 1.15e11 Maximum number of bunches 368 2808 348 collisions/IP Maximum stored energy [MJ] 28 360 Peak luminosity [cm −2 s −1 ] 2e32 1e34 The LHC has excellent single beam lifetime at 3.5 TeV before collisions of around over 200 hours. At the start of a fill the luminosity lifetime is initially in the range 15 to 20 hours lengthening to 25 to 30 hours later. The luminosity lifetime is reasonably well given by the observed emittance growth and the intensity decay. There is minimal drifts in beam overlap during physics and the beams are generally very stable. The 2010 run was driven mainly by commissioning, and not operations for physics. In this regard, any analysis of operational efficiency should be regarded with some latitude. However for a first year the signs are very encouraging. Some very extensive equipment systems performed above expectations (considering mean time between failures etc.); the equipment groups are aware of the weak points and are working to improve them. Technical stops certainly caused problem initially but things got better during the course the year and overall there was impressive availability for a first full year of operations with the final number for machine availability being around 65% pf the scheduled time 2 . 4 2010 - heavy ion run The 2010 finished with a switch from protons to lead ions. The operations team successfully leveraged the experienced gained with protons to rapidly push through the ion commissioning program, relying on the fact that the magnetic machine for ions is near identical to that used for protons. The early ion parameters applicable to the 2010 run are shown in table 4 5 . The first injection of Beam 1 took place on 4 November 2010. Stable Beams were declared for physics on 7 November. In the following days, the number of bunches per beam increase through 2, 5, 17, 69, 121 bunches, injecting single bunches or batches of 4 from the SPS in variants of the “Early” filling scheme (see Table 4). In the last few days of the run, injection of batches of 8 bunches allowed a total of 137 bunches to be established. The SPS supplied around 1.2 ×10 8 ions per bunch which gave a peak luminosity of just over 3×10 25 cm −2 s −1 . An integrated luminosity of 9.7 µb -1 was delivered to Alice, Atlas and CMS with some very interesting results.
Page 1 and 2: 2011 QCD and High Energy Interactio
Page 3 and 4: Proceedings of the XLVIth RENCONTRE
Page 5 and 6: 2011 RENCONTRES DE MORIOND The XLVI
Page 7 and 8: Foreword Contents 1. Higgs Searches
Page 9: 1. Higgs
Page 12 and 13: 95% CL Limit/SM 10 1 Tevatron Run I
Page 14 and 15: Events/5 GeV 6 10 5 10 4 10 3 10 2
Page 16 and 17: Events / 0.5 CDF Run II Preliminary
Page 18 and 19: For the most sensitive sub-channel
Page 20 and 21: Table 1: Table listing the various
Page 22 and 23: various SM Higgs mass hypotheses. T
Page 24 and 25: constraints on parameters are given
Page 26 and 27: Figure 2: Invariant mass of the ele
Page 28 and 29: Figure 4: CDF Exclusion limits for
Page 32 and 33: Table 4: Parameter list for early (
Page 34 and 35: luminosity of 1.2×10 33 cm −2 s
Page 36 and 37: 2 QCD Analysis settings HERA PDFs a
Page 38 and 39: min 2 - 2 20 15 10 5 0 H1 and ZEUS
Page 40 and 41: SM σ / σ 95% CL Limit on 3 10 2 1
Page 42 and 43: NNLO σ/ σSM 95% CL Upper Bound on
Page 44 and 45: the report of this working group. I
Page 46 and 47: 2.3 The impact of different PDF par
Page 49 and 50: SUSY Searches at the Tevatron Ph. G
Page 51 and 52: on the quality (loose or tight) and
Page 53 and 54: SUSY searches at ATLAS N. Barlow, o
Page 55 and 56: channel. These results are combined
Page 57 and 58: Figure 2: The top left plot shows t
Page 59: 2010 data. Analysis techniques for
Page 62 and 63: as main discriminator between event
Page 64 and 65: sign leptons is particularly intere
Page 66 and 67: N of events 5 10 DATA 10 4 3 10 10
Page 68 and 69: ) [pb] ν e → B(W’ × σ 10 1 -
Page 70 and 71: 2 Searches in the dijet final state
Page 72 and 73: ing that the neutrinos were the onl
Page 75 and 76: The Quasi-Classical Model in SU(N)
Page 77 and 78: g (γ µ kµ) γ µ Aa µ g (pk)
Page 79: 3. Top
Page 82 and 83:
of their vertex with respect to the
Page 84 and 85:
of about 9%. 3.1 Differential Cross
Page 86 and 87:
Figure 5: Summary of most recent CD
Page 88 and 89:
the minimum number of jets identifi
Page 90 and 91:
where f’s are probability functio
Page 92 and 93:
hood technique, with a simultaneous
Page 94 and 95:
momentum direction of the b quark f
Page 96 and 97:
Events 200 150 100 50 -1 DØ L=5.4
Page 98 and 99:
after all corrections in the M t¯t
Page 100 and 101:
for prompt J/ψ under the fully tra
Page 102 and 103:
2 Events / 20 MeV/c 50 40 30 20 10
Page 104 and 105:
ATLAS - consists of four parts (mon
Page 106 and 107:
5 D mesons High cross-sections of D
Page 108 and 109:
μ +X') [nb/GeV] → b+X → (pp T
Page 110 and 111:
GeV) μ |
Page 113 and 114:
HEAVY FLAVOUR IN A NUTSHELL Robert
Page 115 and 116:
Figure 1: Overlapping constraints o
Page 117 and 118:
Figure 3: Constraints on new physic
Page 119 and 120:
RECENT B PHYSICS RESULTS FROM THE T
Page 121 and 122:
(IP) distributions are fitted separ
Page 123 and 124:
decays CDF extracts Using a 5.94 fb
Page 125 and 126:
Search for B 0 s → µ+ µ − and
Page 127 and 128:
Ref. 10,11 . The expected GL distri
Page 129 and 130:
IN PURSUIT OF NEW PHYSICS WITH B DE
Page 131 and 132:
τK + K −/τBs 1.01 1.00 0.99 0.9
Page 133 and 134:
CHARMLESS HADRONIC B-DECAYS AT BABA
Page 135 and 136:
surements (fL ∼ 0.5). Several att
Page 137 and 138:
Estimating the Higher Order Hadroni
Page 139 and 140:
the resulting exponent suggests to
Page 141:
The counterpart of the ground-state
Page 144 and 145:
(a) Tree level signal decay b ¯Bs
Page 146 and 147:
the B0 d system LHCb profits from i
Page 148 and 149:
This result is based on averaging o
Page 150 and 151:
y non-perturbative effects. Using t
Page 152 and 153:
e M(Dπ) distributions obtained D +
Page 155 and 156:
CHARM PHYSICS RESULTS AND PROSPECTS
Page 157 and 158:
LHCb is working towards its first m
Page 159 and 160:
Two body hadronic D decays Yu Fushe
Page 161 and 162:
where the effective coefficients aA
Page 163:
6. J. J. Sakurai, Phys. Rev. 156, 1
Page 166 and 167:
states: 6π, 2K4π, 4K2π, KSK3π 1
Page 168 and 169:
egion of X(3872), which corresponds
Page 170 and 171:
Figure 1: The π 0 recoil mass spec
Page 172 and 173:
η → π + π − π 0 η ′ →
Page 174 and 175:
conservation. This second principle
Page 176 and 177:
many of them come from gluon nonper
Page 179 and 180:
Latest Jets Results from the Tevatr
Page 181 and 182:
in for the inclusive trijet event s
Page 183 and 184:
RECENT RESULTS ON JETS FROM CMS F.
Page 185 and 186:
dy (pb/GeV) /dp 2 d 10 10 10 9 10
Page 187 and 188:
RECENT RESULTS ON JETS WITH ATLAS G
Page 189 and 190:
| y| < 0.3 ATLAS Preliminary 2.1 <
Page 191 and 192:
EPOS 2 and LHC Results TanguyPierog
Page 193 and 194:
positions are randomly distributed
Page 195 and 196:
ABOUT THE HELIX STRUCTURE OF THE LU
Page 197 and 198:
Figure 2: Left: Correlations betwee
Page 199 and 200:
Improving NLO-parton shower matched
Page 201 and 202:
due to the inclusion of higher orde
Page 203 and 204:
New Results in Soft Gluon Physics C
Page 205 and 206:
Figure 2: Spacetime depiction of Dr
Page 207 and 208:
Central Exclusive Meson Pair Produc
Page 209 and 210:
in the CEP cross section. However i
Page 211 and 212:
AN AVERAGE b-QUARK FRAGMENTATION FU
Page 213 and 214:
1/N dN/dx 3.5 3 2.5 2 1.5 1 0.5 ALE
Page 215 and 216:
W + W + jj at NLO in QCD: an exotic
Page 217 and 218:
Σ fb Σ fb 3.5 3.0 2.5 2.0 0.65 0.
Page 219 and 220:
W/Z+Jets and W/Z+HF Production at t
Page 221 and 222:
Figure 2: Measured inclusive jet di
Page 223 and 224:
W and Z physics with the ATLAS dete
Page 225 and 226:
SHERPA 9 MC generators but not by P
Page 227 and 228:
W/Z + Jets results from CMS V. CIUL
Page 229 and 230:
Events / 0.1 600 500 400 300 200 10
Page 231 and 232:
TEVATRON RESULTS ON MULTI-PARTON IN
Page 233 and 234:
iterative midpoint cone algorithm w
Page 235 and 236:
INVESTIGATIONS OF DOUBLE PARTON SCA
Page 237 and 238:
¦ § ¦ ¨ ¥ ¦ ¨ § ¦ © ¦ §
Page 239 and 240:
Figure 4: Two-dimensional distribut
Page 241 and 242:
SOFT QCD RESULTS FROM ATLAS AND CMS
Page 243 and 244:
as a function of multiplicity for t
Page 245 and 246:
Determination of αS using hadronic
Page 247 and 248:
α S (m Z 0) 0.15 0.14 0.13 0.12 0.
Page 249 and 250:
Reaching beyond NLO in processes wi
Page 251 and 252:
dσ/dp t,max [fb/GeV] 10 5 10 4 10
Page 253 and 254:
Nonlocal Condensate Model for QCD S
Page 255 and 256:
The lower bound for the integration
Page 257 and 258:
AN ALTERNATIVE SUBTRACTION SCHEME F
Page 259 and 260:
where MBorn,g is the underlying Bor
Page 261 and 262:
THE NNPDF2.1 PARTON SET F. CERUTTI
Page 263 and 264:
ottom masses mb of 4.25, 4.5, 5.0 a
Page 265 and 266:
HOLOGRAPHIC DESCRIPTION OF HADRONS
Page 267 and 268:
∫ SYM = κ d 4 ( 1 xdzTr 2 h(z)F
Page 269 and 270:
Nuclear matter and chiral phase tra
Page 271 and 272:
fact that for Nc ≫ 3 a gas of fre
Page 273 and 274:
Recent Results on Light Hadron Spec
Page 275 and 276:
Figure 3: Mass spectrum fitting wit
Page 277 and 278:
MEASUREMENT OF THE J/ψ INCLUSIVE P
Page 279 and 280:
2 Counts per 40 MeV/c 120 100 80 60
Page 281 and 282:
STUDY OF Ke4 DECAYS IN THE NA48/2 E
Page 283 and 284:
photons were accepted while particl
Page 285:
6. Structure Functions Diffraction
Page 288 and 289:
2 Hadronic Final States and Diffrac
Page 290 and 291:
3 Summary A brief overview of recen
Page 293 and 294:
Using HERA Data to Determine the In
Page 295 and 296:
k f n 0.4 0.2 0 -0.2 0.4 0.2 0 -0.2
Page 297:
The singular term, on the other han
Page 301 and 302:
Pomeron Kernel: The leading order B
Page 303 and 304:
DIFFRACTION, SATURATION AND pp CROS
Page 305 and 306:
In Ref. 6 , the saturated Froissart
Page 307 and 308:
Transverse Energy Flow with Forward
Page 309 and 310:
1/N d dE t /dη 0.1 0.09 0.08 0.07
Page 311:
7. Heavy Ions
Page 314 and 315:
dη)/(0.5〈 N 〉 ) part ch (dN 10
Page 316 and 317:
) 3 (fm long R side R out R 400 350
Page 318 and 319:
correlation density is computed as
Page 320 and 321:
Away-side gaussian width 1.4 1.2 1
Page 322 and 323:
Figure 1: (a) J/ψ rapidity distrib
Page 324 and 325:
lower x, or forward rapidity one ex
Page 326 and 327:
φ ∆ /d assoc dN trig 1/N 0.5 0.4
Page 328 and 329:
AA,Pythia I 2.5 2.0 1.5 1.0 0.5 0.0
Page 330 and 331:
(1/N ) dN/dA evt J φ Δ ) dN/d (1/
Page 332 and 333:
[GeV] Tower ET Σ 50 45 40 35 30 25
Page 334 and 335:
3 Results 3.1 Dijet Properties in p
Page 336 and 337:
(GeV/c) (GeV/c) T T p < 40 20
Page 338 and 339:
wheredσm(N +N → h+X)/dp Tdy isth
Page 340 and 341:
R AA 0.6 0.5 0.4 0.3 0.2 0.1 0 0.5
Page 342 and 343:
Here D is the diffusion coefficient
Page 345 and 346:
The effect of triangular flow in je
Page 347 and 348:
When both trigger and associated pa
Page 349 and 350:
The first Z boson measurement in th
Page 351 and 352:
Figure 1: Dimuon invariant mass spe
Page 353:
2. V. Kartvelishvili, R. Kvatadze a
Page 356 and 357:
esolution [ µ m] ! r 0 d 300 250 2
Page 358 and 359:
Figure 5: Differential transverse m
Page 360 and 361:
Figure 1: Average nuclear modificat
Page 362 and 363:
Another way of using direct photons
Page 364 and 365:
Pb R g 2 Nuclear Modifications for
Page 366 and 367:
q T 1/R AA 1.6 1.4 1.2 1 0.8 LO Fra
Page 368 and 369:
] 2 > [g/cm max
Page 370 and 371:
Methods (a) and (c) constrain the e
Page 373 and 374:
EXPERIMENTAL SUMMARY: ENTERING THE
Page 375 and 376:
ut also for valence quarks involved
Page 377 and 378:
The sensitivity to Standard Model H
Page 379 and 380:
Figure 10: Top pair mass spectrum m
Page 381 and 382:
Figure 13: Particle densities (left
Page 383 and 384:
4 Low energy precision Spectroscopy
Page 385:
asymmetries associated to Bd and Bs
Page 389 and 390:
XLVIth Rencontres de Moriond QCD an
show all

2011 QCD and High Energy Interactions - Rencontres de Moriond ...

Create successful ePaper yourself

Delete template?

Save as template?