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The respective contributions of cold-matter and hot-medium effects to thesuppression of $\Upsilon(1S)$ and $\Upsilon(2S)$ mesons in pPb collisions atenergies reached at the Large Hadron Collider (LHC) are investigated. Whereasknown alterations of the parton density functions in the lead nucleus andcoherent parton energy loss account for the leading fraction of themodifications in cold nuclear matter (CNM), the hot-medium (quark-gluon plasma,QGP) effects turn out to be relevant in spite of the small initial spatialextent of the fireball. We compare our transverse-momentum-, rapidity-, andcentrality-dependent theoretical results for the $\Upsilon$ suppression in pPbcollisions at a center-of-mass energy of $\sqrt{s_\text{NN}} = 8.16$ TeV withrecent LHCb and preliminary ALICE data from the Large Hadron Collider (LHC).Both cold-matter and hot-medium effects are needed to account for the data. Theinitial central temperature of the fireball is found to be $T_0 \simeq 460$MeV.

Hot-medium effects on $\Upsilon$ yields in pPb collisions at $\sqrt{s_\text{NN}}=8.16$ TeV