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Evidence for collectivity in pp collisions at the LHC

The collaboration
Phys.Lett. B765 (2017) 193-220, 2017

Abstract (data abstract)
CERN-LHC. Measurements of two- and multi-particle angular correlations in pp collisions at sqrt(s) = 5, 7, and 13 TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0 inverse picobarn (5 TeV), 6.2 inverse picobarns (7 TeV), and 0.7 inverse picobarns (13 TeV), were collected using the CMS detector at the LHC. The second-order (v[2]) and third-order (v[3]) azimuthal anisotropy harmonics of unidentified charged particles, as well as v[2] of K0 short and Lambda/anti-Lambda particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v[2] values of charged hadrons (mostly pions), K0 short, and Lambda/anti-Lambda, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pt of about 2 GeV/c. For 13 TeV data, the v[2] signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.

• #### Table 1

Data from Figure 4

10.17182/hepdata.76506.v1/t1

The second-order Fourier coefficients, $V_{2\Delta}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged particles.

• #### Table 2

Data from Figure 4

10.17182/hepdata.76506.v1/t2

The second-order Fourier coefficients, $V_{2\Delta}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged particles, after correcting for back-to-back...

• #### Table 3

Data from Figure 4

10.17182/hepdata.76506.v1/t3

The second-order Fourier coefficients, $V_{3\Delta}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged particles.

• #### Table 4

Data from Figure 4

10.17182/hepdata.76506.v1/t4

The second-order Fourier coefficients, $V_{3\Delta}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged particles, after correcting for back-to-back...

• #### Table 5

Data from Figure 5

10.17182/hepdata.76506.v1/t5

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged...

• #### Table 6

Data from Figure 5

10.17182/hepdata.76506.v1/t6

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged...

• #### Table 7

Data from Figure 5

10.17182/hepdata.76506.v1/t7

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged...

• #### Table 8

Data from Figure 5

10.17182/hepdata.76506.v1/t8

The triangular flow after correcting for back-to-back jet correlations, $v_{3}^{sub}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged...

• #### Table 9

Data from Figure 5

10.17182/hepdata.76506.v1/t9

The triangular flow after correcting for back-to-back jet correlations, $v_{3}^{sub}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged...

• #### Table 10

Data from Figure 5

10.17182/hepdata.76506.v1/t10

The triangular flow after correcting for back-to-back jet correlations, $v_{3}^{sub}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged...

• #### Table 11

Data from Figure 6

10.17182/hepdata.76506.v1/t11

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged particles.

• #### Table 12

Data from Figure 6

10.17182/hepdata.76506.v1/t12

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged particles.

• #### Table 13

Data from Figure 6

10.17182/hepdata.76506.v1/t13

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged particles.

• #### Table 14

Data from Figure 6

10.17182/hepdata.76506.v1/t14

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged...

• #### Table 15

Data from Figure 6

10.17182/hepdata.76506.v1/t15

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged...

• #### Table 16

Data from Figure 6

10.17182/hepdata.76506.v1/t16

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged...

• #### Table 17

Data from Figure 7

10.17182/hepdata.76506.v1/t17

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged particles.

• #### Table 18

Data from Figure 7

10.17182/hepdata.76506.v1/t18

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for $K^{0}_{S}$.

• #### Table 19

Data from Figure 7

10.17182/hepdata.76506.v1/t19

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for $\Lambda/\bar{\Lambda}$.

• #### Table 20

Data from Figure 7

10.17182/hepdata.76506.v1/t20

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged particles.

• #### Table 21

Data from Figure 7

10.17182/hepdata.76506.v1/t21

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for $K^{0}_{S}$.

• #### Table 22

Data from Figure 7

10.17182/hepdata.76506.v1/t22

The elliptic flow, $v_{2}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for $\Lambda/\bar{\Lambda}$.

• #### Table 23

Data from Figure 8

10.17182/hepdata.76506.v1/t23

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for charged...

• #### Table 24

Data from Figure 8

10.17182/hepdata.76506.v1/t24

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for $K^{0}_{S}$.

• #### Table 25

Data from Figure 8

10.17182/hepdata.76506.v1/t25

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $p_{T}$ for $\Lambda/\bar{\Lambda}$.

• #### Table 26

Data from Figure 8

10.17182/hepdata.76506.v1/t26

The elliptic flow per constituent quark after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)/n_{q}$, as a function of...

• #### Table 27

Data from Figure 8

10.17182/hepdata.76506.v1/t27

The elliptic flow per constituent quark after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of...

• #### Table 28

Data from Figure 9

10.17182/hepdata.76506.v1/t28

The four-particle cumulant, $c_{2}(4)$, as a function of $N_{offline}^{trk}$ for charged particles.

• #### Table 29

Data from Figure 9

10.17182/hepdata.76506.v1/t29

The four-particle cumulant, $c_{2}(4)$, as a function of $N_{offline}^{trk}$ for charged particles.

• #### Table 30

Data from Figure 9

10.17182/hepdata.76506.v1/t30

The four-particle cumulant, $c_{2}(4)$, as a function of $N_{offline}^{trk}$ for charged particles.

• #### Table 31

Data from Figure 9

10.17182/hepdata.76506.v1/t31

The six-particle cumulant, $c_{2}(6)$, as a function of $N_{offline}^{trk}$ for charged particles.

• #### Table 32

Data from Figure 10

10.17182/hepdata.76506.v1/t32

The elliptic flow after correcting for back-to-back jet correlations, $v_{2}^{sub}(2, |\Delta\eta| > 2)$, as a function of $N_{offline}^{trk}$ for charged...

• #### Table 33

Data from Figure 10

10.17182/hepdata.76506.v1/t33

The elliptic flow, $v_{2}(4)$, as a function of $N_{offline}^{trk}$ for charged particles.

• #### Table 34

Data from Figure 10

10.17182/hepdata.76506.v1/t34

The elliptic flow, $v_{2}(6)$, as a function of $N_{offline}^{trk}$ for charged particles.