The HBT-interferometry of expanding sources

Akkelin, S. V.; Sinyukov, Yu. M.

doi:10.1016/0370-2693(95)00765-d

Cited by 153 publications

(206 citation statements)

References 3 publications

Supporting

Mentioning

185

Contrasting

Order By: Relevance

“…Such particles cannot have a small momentum difference, and so correlation functions of boosted particles are sensitive to only part of the collision region. This part is referred to as the "homogeneity length" [31]. The decrease of the size with k T is observed in experimental data from heavy-ion collisions at all centralities, various collision energies and colliding system types, and is well described quantitatively in hydrodynamic models [11,30] and qualitatively in hadronic rescattering codes [32].…”

Section: Introductionmentioning

confidence: 91%

Centrality dependence of pion freeze-out radii in Pb-Pb collisions atsNN=2.76 TeV

et al. 2016

View full text Add to dashboard Cite

We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at √ s NN = 2.76 TeV as a function of collision centrality and the average transverse momentum of the pair k T . Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged onedimensional radii are extracted. The radii decrease with k T , following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with dN ch /dη 1/3 . This behavior is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller √ s NN , a decrease in the ratio R out /R side is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider.

show abstract

Section: Introductionmentioning

confidence: 91%

Centrality dependence of pion freeze-out radii in Pb-Pb collisions atsNN=2.76 TeV

et al. 2016

View full text Add to dashboard Cite

show abstract

“…C(q q q, K K K) is the modification to the conditional probability for measuring particle b with momentum p p p b = K K K− 1 2 q q q if particle a has been measured with momentum p p p a = K K K+ 1 2 q q q, due to two-particle effects sensitive to space-time separation. The explicit K K K-dependence reflects the fact that the separation distribution may depend on the average momentum of the pair [2] and in general does so for exploding sources [24].…”

Section: Variances Versus Hbt Radiimentioning

confidence: 97%

“…(2,3) and then fit the latter with a Gaussian, using a procedure very similar to the one used in experiment. The main difference is that the theoretical correlation function can be calculated with arbitrary precision, so the notion of a statistical error does not enter.…”

Section: Direct Calculation Of Hbt Radiimentioning

confidence: 99%

See 1 more Smart Citation

Fitted HBT radii versus space-time variances in flow-dominated models

2007

View full text Add to dashboard Cite

The inability of otherwise successful dynamical models to reproduce the "HBT radii" extracted from twoparticle correlations measured at the Relativistic Heavy Ion Collider (RHIC) is known as the "RHIC HBT Puzzle". Most comparisons between models and experiment exploit the fact that for Gaussian sources the HBT radii agree with certain combinations of the space-time widths of the source which can be directly computed from the emission function, without having to evaluate, at significant expense, the two-particle correlation function. We here study the validity of this approach for realistic emission function models some of which exhibit significant deviations from simple Gaussian behaviour. By Fourier transforming the emission function we compute the 2-particle correlation function and fit it with a Gaussian to partially mimic the procedure used for measured correlation functions. We describe a novel algorithm to perform this Gaussian fit analytically. We find that for realistic hydrodynamic models the HBT radii extracted from this procedure agree better with the data than the values previously extracted from the space-time widths of the emission function. Although serious discrepancies between the calculated and measured HBT radii remain, we show that a more "apples-to-apples" comparison of models with data can play an important role in any eventually successful theoretical description of RHIC HBT data.

show abstract

“…between interpenetration of the ions and kinematic freezeout of the products) [5,20]. Naturally, this is not a unique, system-wide time, but a distribution.…”

Section: Boltzmann Transport Calculationsmentioning

confidence: 99%

What to expect when you're expecting: femtoscopy at the LHC

Lisa¹

2007

Braz. J. Phys.

View full text Add to dashboard Cite

A huge systematics of femtoscopic measurements have been used over the past 20 years to characterize the system created in heavy ion collisions. These measurements cover two orders of magnitude in energy, and with LHC beams imminent, this range will be extended by more than another order of magnitude. Here, I discuss theoretical expectations of femtoscopy of A + A and p + p collisions at the LHC, based on Boltzmann and hydrodynamic calculations, as well as on naive extrapolation of existing systematics.

show abstract

The HBT-interferometry of expanding sources

Cited by 153 publications

References 3 publications

Centrality dependence of pion freeze-out radii in Pb-Pb collisions atsNN=2.76 TeV

Centrality dependence of pion freeze-out radii in Pb-Pb collisions atsNN=2.76 TeV

Fitted HBT radii versus space-time variances in flow-dominated models

What to expect when you're expecting: femtoscopy at the LHC

Contact Info

Product

Resources

About